Consulta: subjectFacets:"Tuna"
Registros recuperados: 35
Data/hora: 06/06/2024 01:18:34

The influence of the environment on the variability of monthly tuna biomass around a moored, fish-aggregating device
Provedor de dados: 5
Autores: Doray, Mathieu; Petitgas, Pierre; Nelson, Laetitia; Mahevas, Stephanie; Josse, E; Reynal, Lionel.
Fish-aggregating devices (FADs) are increasingly used worldwide to enhance tuna catches. Meanwhile, ecosystem-based management of this fishery is constrained by a paucity of information regarding the interaction of FAD-associated tuna aggregations with their local environment. This paper reports the results of a nine-month study around a FAD moored near Martinique Island, aimed at assessing the effects of the local environment on the variability of monthly estimates of proximate tuna biomass. Dual-frequency, active acoustics provided highresolution quantitative data on the pelagic community around the FAD, from fish to micronekton forage. Geostatistics were used to compute biomass estimates of the tuna aggregation comprising most of the FADassociated fish...
Tipo: Text
Palavras-chave: Lesser Antilles; Tuna; Environment; Geostatistics; Biomass estimation; Fish aggregating device.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2008/publication-6162.pdf

L'agrégation de thons de sub-surface au sein du système [DCP ancré - macronecton - environnement - pêche] en Martinique : étude hiérarchique par méthodes acoustiques, optiques et halieutiques
Provedor de dados: 5
Autores: Doray, Mathieu.
Artificial Fish Aggregating Devices (FADs) are known to concentrate tropical tunas. This aggregative behaviour drastically increases the vulnerability of these species to fishing. Alternatively, FADs can be used as oceanic observatories to study the aggregative behaviour of large pelagic fish. We conducted sea surveys in Martinique (Lesser Antilles) to i) establish a typology of the pelagic fish aggregations found around moored FADs ii) study their relations with their biotic and abiotic environment and the local fishery. The mean biomass of large pelagic fish aggregations was also estimated to provide scientific inputs to achieve a sustainable management of the moored FAD fishery. The first part presents the background of the study. We introduce the...
Tipo: Text
Palavras-chave: Martinique; Lesser Antilles; Hierarchy; Advection diffusion models; Geostatistics; Micronekton; Tuna/environment relationships; Aggregative behaviour; Tuna; Underwater video; Echosounding; FAD; Martinique; Petites Antilles; Hiérarchie; Modèles d'advection diffusion; Géostatistique; Micronecton; Relation thon/environnement; Comportement agrégatif; Thon; Vidéo sous marine; Acoustique; DCP.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/these-1735.pdf

The spectre of uncertainty in management of exploited fish stocks: The illustrative case of Atlantic bluefin tuna
Provedor de dados: 5
Autores: Fromentin, Jean-marc; Bonhommeau, Sylvain; Arrizabalaga, Haritz; Kell, Laurence T.
The recent overexploitation of East Atlantic and Mediterranean bluefin tuna stock has been well documented in the media where it has become the archetype of overfishing and general mis-management. Beyond the public debate, the crisis also highlighted how the interactions between science and management can change through time according to the awareness of the public opinion. To reflect these issues, the history of Atlantic bluefin tuna overfishing is first described. Then, the major uncertainties that undermine the current scientific advice are summarized and the importance of reducing their impacts by improving knowledge and developing robust scientific framework is considered. The study also discusses how uncertainty was used by different lobbies to...
Tipo: Text
Palavras-chave: Overexploitation; Rebuilding; Uncertainty; Management; Scientific diagnosis; Tuna.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00177/28776/27302.pdf

Espèces de thonidés d'intérêt potentiel pour l'aquaculture en Méditerranée
Provedor de dados: 5
Autores: Le Gall, Jean-yves.
Bluefin tuna is particularly concerned in the project of tuna rearing in the Mediterranean sea. However there are no reasons to neglect the other tuna species of the Mediterranean sea which present an interesting material for the development of the research on tuna cultivation.
Tipo: Text
Palavras-chave: Thon; Aquaculture; Méditerranée; Tuna; Mariculture; Mediterranea.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00342/45326/44787.pdf

A geostatistical method for assessing biomass of tuna aggregations around moored fish aggregating devices with star acoustic surveys
Provedor de dados: 5
Autores: Doray, Mathieu; Petitgas, Pierre; Josse, E.
Universal kriging was used to model the spatio-temporal variability in the acoustic density of tuna aggregations recorded during star echosounding surveys around moored fish aggregating devices (FADs) in Martinique (Lesser Antilles). The large-scale deterministic drift in the tuna spatial distribution was modeled using an advection-diffusion equation applied to animal grouping. Residuals from the drift were modeled as a random component with small-scale spatial correlation. An estimation variance formula was derived from this deterministic-statistical mixed model to assess the mean precision of density estimates of daytime tuna aggregation. The mean relative error obtained with our star design for daytime surveys was 24%. The methodology was applied to...
Tipo: Text
Palavras-chave: Acoustic survey precision; Advection diffusion model; Moored fish aggregating devices; Tuna; Geostatistics.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4559.pdf

Joint use of echosounding, fishing and video techniques to assess the structure of fish aggregations around moored Fish Aggregating Devices in Martinique (Lesser Antilles)
Provedor de dados: 5
Autores: Doray, Mathieu; Josse, E; Gervain, P; Reynal, Lionel; Chantrel, Josselin.
From April 2003 to April 2004 monthly sea surveys were conducted around 2 fish aggregating devices (FADs) moored at 2000 and 2500 m depth in Martinique (Lesser Antilles). The use of a dual frequency splitbeam echosounder combined with an underwater camera and fishing methods allowed assessment of average space and time distribution of pelagic fish aggregated beneath the FADs, as well as identification of their overall size and species composition. At daytime, 4 fish aggregations were identified at each FAD, representing 4 distinct types: i) an aggregation of small juvenile tuna (mean fork length, FL: 30 cm) observed very close to the surface in 25% of daytime periods; ii) a small surface aggregation dominated by carangids, Caranx crysos, present in 65% of...
Tipo: Text
Palavras-chave: Lesser Antilles; Tuna; Aggregative behaviour; Small scale fishery; Underwater video; Acoustics; Fish aggregating device.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3634.pdf

Resource partitioning within a tropical seabird community: new information from stable isotopes
Provedor de dados: 5
Autores: Cherel, Y; Le Corre, M; Jaquemet, S; Menard, Frederic; Richard, Pierre; Weimerskirch, H.
Characteristics of the tropical oceanic environment (low productivity, little seasonality) and poor diversity of tropical seabird foraging methods and prey relative to temperate and polar species suggest that tropical seabirds overall encompass a narrow range of isotopic niches, with large overlaps among species. To test this hypothesis, we examined the stable carbon (delta C-13) and nitrogen (delta N-15) isotopic composition of blood and feathers of 5 seabird species from Europa Island, Mozambique Channel. While differences were small, blood delta C-13 and delta N-15 values characterized 5 distinct and non-overlapping trophic niches during the breeding period. Seabirds used 2 distinct foraging areas (delta C-13), one used by sooty tern Sterna fuscata and...
Tipo: Text
Palavras-chave: Trophic segregation; Tuna; Sooty tern; Pelagic ecosystem; Frigatebird; Booby.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4675.pdf

Effect of diets containing tuna head hydrolysates on the survival and growth of shrimp Penaeus vannamei
Provedor de dados: 5
Autores: Nguyen, Thi-my-huong; Perez-galvez, Raul; Berge, Jean-pascal.
A feeding trial was conducted to evaluate the effect of the supplementation of hydrolysates from tuna head on the survival and growth of Penaeus vannamei. To this end, a feeding trial was performed on eleven groups of shrimps of average weight 4.34 g. Every group was distributed into three tanks (30 shrimps per tank of 150 L) and was fed with one of the following eleven diets, all of them containing 40% crude protein: one diet containing tuna head meal as the principal protein source, which was used as control diet; nine diets formulated by replacing 50% tuna head meal by ﬁsh protein hydrolysates (FPH), and ﬁnally one commercial diet chosen as a reference. FPH were obtained by hydrolysis of tuna head during 2, 3 or 6 h and ulterior centrifugation in order...
Tipo: Text
Palavras-chave: Tuna; Head; Fish protein hydrolysates; Growth of shrimp.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00064/17517/15138.pdf

Enzymatic Hydrolysis of Yellowfin Tuna (Thunnus albacares) By-Products Using Protamex Protease
Provedor de dados: 5
Autores: Nguyen, Thi-my-huong; Sylla, Khalifa Serigne Babacar; Randriamahatody, Zo; Donnay-moreno, Claire; Moreau, Jacques; Luyen Thi Tran,; Berge, Jean-pascal.
Long-term proteolysis of tuna by-products (head, viscera and tail) by the wide spectrum protease Protamex has been investigated and compared. After hydrolysis, two fractions (soluble aqueous phase and insoluble sludge) were collected. Chemical compositions of each fraction and molecular mass distributions of soluble peptides were determined. Degrees of hydrolysis obtained after 12 h of hydrolysis of head, viscera and tail were 32.3, 16.8 and 22.2 %, respectively. Nitrogen recovery in the soluble fractions was 73.6 % for the head, 82.7 % for the viscera and 85.8 % for the tail. Lipid distribution indicated that the majority of lipids remained in the sludge. Such proteolysis appears useful for the production of very different fractions: one rich in peptides...
Tipo: Text
Palavras-chave: Tuna; By-products; Proteolysis; Nitrogen recovery; Fish protein hydrolysates.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00030/14142/14042.pdf

Fish aggregation device (FAD) research: gaps in current knowledge and future directions for ecological studies
Provedor de dados: 5
Autores: Dempster, Tim; Taquet, Marc.
We reviewed the literature concerning fish aggregation devices (FADs) to determine areas of relative research deficiency. Using specific searches of the Aquatic Sciences and Fisheries Abstracts ( ASFA) database from 1978 to December 2003 and a classical search of the pre-1978 literature, we collected 407 references on FADs. Publications before 1980 were predominantly peer-reviewed, although non-peer reviewed literature has dominated since 1980, due to the numerous technical reports produced as FADs became more widely used in artisinal and large-scale industrial. sheries in the 1980s. Most studies of the ecology of FAD-associated fish were descriptive, with few mensurative experimental studies and even fewer manipulative experimental studies that tested...
Tipo: Text
Palavras-chave: Tuna; Pelagic fish; Literature review; FAD; Fish Aggregation Device; Association.
Ano: 2004
URL: https://archimer.ifremer.fr/doc/2004/publication-721.pdf

Quantification des bactéries histaminogènes et maîtrise de la formation d'histamine dans les produits marins par biopréservation
Provedor de dados: 5
Autores: Podeur, Gaetan.
Histamine-producing bacteria were isolated from naturally contaminated seafood, some of responsible for histamine-poisoning. At the same time, lactic acid bacteria were isolated on the same products and clustered according to their inhibitory activity against 4 histamine-producing species. Most of the strains were identified as Lactobacillus fuchuensis or Lactobacillus sakei. Twelve lactic acid bacteria were selected for challenge-test on canned, cooked or smoked tuna. Challenge-test combined with sensory analysis performed on cooked vacuum-packed tuna against Morganella psychrotolerans and Morganella morganii, demonstrated an important inhibitory effect on growth and production of histamine with L. sakei CNCM I-4707. Bacterial count was reduced by 3 to 5...
Tipo: Text
Palavras-chave: Biopréservation; Thon; Bactérie lactique; Intoxication histaminique; Morganella morganii; Morganella psychrotolerans; Lactobacillus sakei; Analyse sensorielle; PCR en temps réel; Étape d'enrichissement; RT-qPCR; Biopreservation; Tuna; Lactic acid bacteria; Scombroid poisoning; Morganella morganii; Morganella psychrotolerans; Lactobacillus sakei; Sensory analysis; Real-time PCR; Enrichment step; RT-qPCR.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00241/35203/33709.pdf

Satellite-linked acoustic receivers to observe behavior of fish in remote areas
Provedor de dados: 5
Autores: Dagorn, L; Pincock, D; Girard, C; Holland, K; Taquet, Marc; Sancho, G; Itano, D; Aumeeruddy, R.
Automated acoustic receivers are now widely used by biologists to study the behavior of fish. However, currently available acoustic receivers require physical recovery of the units to download stored data. Such operation is often difficult in remote study areas like in the open ocean. We present a new satellite-linked acoustic receiver (Vemco VR3-Argos) that allows downloading data through a satellite uplink (Argos). The VR3-Argos can last up to one year, sending GPS positions and tag data at regular time intervals. We illustrate the advantages of this new technology with tagging data from 121 fish of seven species (yellowfin tuna, bigeye tuna, skipjack tuna, wahoo, dolphinfish, silky shark and oceanic triggerfish) caught and released around drifting fish...
Tipo: Text
Palavras-chave: Pelagic fish; Tuna; Fish telemetry; Acoustic receiver; FAD.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3731.pdf

Impact of increasing deployment of artificial floating objects on the spatial distribution of social fish species
Provedor de dados: 5
Autores: Sempo, Gregory; Dagorn, Laurent; Robert, Marianne; Deneubourg, Jean-louis.
1. Approximately 300 pelagic fish species naturally aggregate around floating objects (FOBs) at the surface of the oceans. Currently, more than 50% of the world catch of tropical tuna comes from the industrial tuna fisheries around drifting FOBs. Greater understanding of the complex decision-making processes leading to this aggregation pattern and the impact of the massive release of artificial FOBs by fishermen on the spatial distribution and management of tuna is needed. 2. We analyse how the interplay between social (relationships between individuals) and non-social (responses to the environment) behaviours may affect the spatial distribution of a population in a multi-FOB environment. Taking the example of tropical tunas associating with FOBs and using...
Tipo: Text
Palavras-chave: Behaviour-based modelling; Bycatch; FAD; FOB; Sustainable fishery; Tuna.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00151/26275/24439.pdf

Effect of pelagic longline bait type on species selectivity: a global synthesis of evidence
Provedor de dados: 5
Autores: Gilman, Eric; Chaloupka, Milani; Bach, Pascal; Fennell, Hannah; Hall, Martin; Musyl, Michael; Piovano, Susanna; Poisson, Francois; Song, Liming.
Fisheries can profoundly affect bycatch species with ‘slow’ life history traits. Managing bait type offers one tool to control species selectivity. Different species and sizes of marine predators have different prey, and hence bait, preferences. This preference is a function of a bait’s chemical, visual, acoustic and textural characteristics and size, and for seabirds the effect on hook sink rate is also important. We conducted a global meta-analysis of existing estimates of the relative risk of capture on different pelagic longline baits. We applied a Bayesian random effects meta-analytic regression modelling approach to estimate overall expected bait-specific catch rates. For blue shark and marine turtles, there were 34% (95% HDI: 4–59%) and 60% (95%...
Tipo: Text
Palavras-chave: Bait; Bycatch; Longline; Mitigation; Selectivity; Tuna.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75536/76441.pdf

Development of a qPCR Method for the Identification and Quantification of Two Closely Related Tuna Species, Bigeye Tuna (     Thunnus obesus     ) and Yellowfin Tuna (     Thunnus albacares     ), in Canned Tuna
Provedor de dados: 5
Autores: Bojolly, Daline; Doyen, Perine; Le Fur, Bruno; Christaki, Urania; Verrez-bagnis, Veronique; Grard, Thierry.
Bigeye tuna (Thunnus obesus) and yellowfin tuna (Thunnus albacares) are among the most widely used tuna species for canning purposes. Not only substitution but also mixing of tuna species is prohibited by the European regulation for canned tuna products. However, as juveniles of bigeye and yellowfin tunas are very difficult to distinguish, unintentional substitutions may occur during the canning process. In this study, two mitochondrial markers from NADH dehydrogenase subunit 2 and cytochrome c oxidase subunit II genes were used to identify bigeye tuna and yellowfin tuna, respectively, utilizing TaqMan qPCR methodology. Two different qPCR-based methods were developed to quantify the percentage of flesh of each species used for can processing. The first one...
Tipo: Text
Palavras-chave: Tuna; Authentication; Quantification; Canned products; TaqMan; QPCR; Species identification; Bigeye tuna (Thunnus obesus); Yellowfin tuna (Thunnus albacares).
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00371/48217/48403.pdf

Characterization of the spoilage potential of pure and mixed cultures of bacterial species isolated from tropical yellowfin tuna (     Thunnus albacares     )
Provedor de dados: 5
Autores: Silbande, A.; Cornet, Josiane; Cardinal, Mireille; Chevalier, Frederique; Rochefort, K.; Smith-ravin, J.; Adenet, S.; Leroi, Francoise.
Aim The spoilage potential of 28 bacterial strains isolated from spoiled raw yellowfin tuna was evaluated. Methods and Results Bacterial species were inoculated in irradiated tuna matrix. Chemical changes, bacterial growth and sensory quality were monitored during aerobic storage at 8°C. Pseudomonas spp., Enterobacter spp. and Escherichia hermanii had no spoiling effect. Brochothrix thermosphacta and Carnobacterium divergens/maltaromaticum developed moderate unpleasant odors. Hafnia paralvei and Serratia spp. released strong off-odors (pyrrolidine, sulfur/cabbage). No bacterial group (except H. paralvei) combined with Pseudomonas spp. deteriorated the sensory quality of tuna. When C. divergens/maltaromaticum was associated with H. paralvei or B....
Tipo: Text
Palavras-chave: Bacterial interactions; Bacterial species; Fish; Pseudomonas; Sensory quality; Spoilage potential; Tropical; Tuna.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00414/52557/53395.pdf

Acoustic characterisation of pelagic fish aggregations around moored fish aggregating devices in Martinique (Lesser Antilles)
Provedor de dados: 5
Autores: Doray, Mathieu; Josse, Erwan; Gervain, Paul; Reynal, Lionel; Chantrel, Josselin.
Sea cruises were conducted for 57 days over 16 months to characterise pelagic fish aggregations around 2 moored fish aggregating devices (FADs) in Martinique (Lesser Antilles). Echosounder surveys run in a star pattern were used in conjunction with obliquely beamed sonar observations. An echo-integration-by-shoal algorithm was implemented to isolate pelagic fish shoals from sound scattering layers and to compute mean morphometric, positional and density parameters. Tree regressions were used to select and classify pelagic fish Target Strengths (TS), with reference to their spatial and temporal characteristics. The main type of pelagic fish aggregation was a large sub-surface aggregation. It was observed during all daytime periods within a radius of 400 m...
Tipo: Text
Palavras-chave: Lesser Antilles; Tuna; Large pelagic fish; Aggregative behaviour; Shoal density; Target Strength; Acoustics; Fish Aggregating Device.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1734.pdf

Dosage rapide de l'histamine dans le thon : mise au point, optimisation, applications
Provedor de dados: 5
Autores: Bregeon, Nelly.
After a bibliographic analysis about histamine in tuna and thanks to a high matematical process - the experimental design method - the author has adjusted a quick proportioning method for histamine. The enzymatic technique used in this case requires a microplates reader. It was afterwards valided by comparison with HPLC methode consideres as reference.
Tipo: Text
Palavras-chave: Thon Histamine; Plans cxperimentaux; Dosage enzymatiquc; Colorimetre; Test rapide; Tuna; Histamine; Experimental design method; Enzymatic analysis; Spectrophotometry; Quick test.
Ano: 1992
URL: https://archimer.ifremer.fr/doc/00464/57524/59714.pdf

Gene expression pattern of digestive and antioxidant enzymes during the larval development of reared Atlantic bluefin tuna (ABFT), Thunnus thynnus L.
Provedor de dados: 5
Autores: Mazurais, David; Coves, Denis; Papandroulakis, Nikos; Ortega, Aurelio; Desbruyeres, Elisabeth; Huelvan, Christine; Le Gall, Marie-madeleine; De La Gandara, Fernando; Cahu, Chantal.
The aim of this study was to determine whether mortality observed during the larval development of reared bluefin tuna (Thunnus thynnus) could be related to improper expression profiles of key genes involved in digestive or antioxidant response capabilities. Tuna larvae were sampled at hatching, 2, 5, 10, 15 and 20 dph (days post hatching) for the relative quantification of transcripts encoded by genes involved in digestive [trypsinogen 1 (TRYP1), alpha-amylase (AMY), aminopeptidase N (ANPEP)] and antioxidant [catalase (CAT)] functions. The levels of expression of ANPEP related to the development and maturation of intestinal function increased from 5 to 20 dph. Furthermore, AMY and TRYP1 genes, which are pancreatic enzymes implicated in carbohydrate and...
Tipo: Text
Palavras-chave: Tuna; Gene; Expression; Development; Digestion; Antioxidant.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00171/28264/26521.pdf

Defining the stock structures of key commercial tunas in the Pacific Ocean II: Sampling considerations and future directions
Provedor de dados: 5
Autores: Moore, Bradley R.; Adams, Tim; Allain, Valerie; Bell, Johann D.; Bigler, Mark; Bromhead, Don; Clark, Sangaa; Davies, Campbell; Evans, Karen; Faasili, Ueta; Farley, Jessica; Fitchett, Mark; Grewe, Peter M.; Hampton, John; Hyde, John; Leroy, Bruno; Lewis, Antony; Lorrain, Anne; Macdonald, Jed I.; Marie, Amandine D.; Minte-vera, Carolina; Natasha, Janice; Nicol, Simon; Obregon, Pablo; Peatman, Thomas; Pecoraro, Carlo; Phillip, N. Bradley; Pilling, Graham M.; Rico, Ciro; Sanchez, Caroline; Scott, Robert; Scutt Phillips, Joe; Stockwell, Brian; Tremblay-boyer, Laura; Usu, Thomas; Williams, Ashley J.; Smith, Niamh.
Delineating the stock structure of highly-mobile, wide-ranging fishes subject to exploitation is a challenging task, yet one that is fundamental to optimal fisheries management. A case in point are stocks of skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), bigeye tuna (Thunnus obesus) and albacore tuna (Thunnus alalunga) in the Pacific Ocean, which support important commercial, artisanal, subsistence, and recreational fisheries, and contribute roughly 70 % of global commercial tuna catches. Although some spatial and temporal structuring is recognised within these stocks, growing evidence from a range of approaches suggests that the stock structure of each tuna species is more complex than is currently assumed in both stock assessment...
Tipo: Text
Palavras-chave: Tuna; Pacific Ocean; Movement; Spatial dynamics; Stock structure; Fisheries management.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00630/74168/73773.pdf

Development of a real-time PCR method coupled with a selective pre-enrichment step for quantification of Morganella morganii and Morganella psychrotolerans in fish products
Provedor de dados: 5
Autores: Podeur, Gaetan; Dalgaard, Paw; Leroi, Francoise; Prevost, Herve; Ernborg, Jette; Martinussen, Jan; Hansen, Lars Hestbjerg; Filet, Marie-france.
Histamine fish poisoning is common and due to toxic concentrations of histamine often produced by Gram-negative bacteria in fin-fish products with a high content of the free amino acid histidine. The genus Morganella includes two species previously reported to cause incidents of histamine fish poisoning. Morganella morganii and Morganella psychrotolerans are both strong producer of histamine. However, little is known about the occurrence and critical stages for fish contamination with these bacteria. To elucidate contamination routes of Morganella, specific real-time quantitative PCR (RTi qPCR) methods for quantification of M. morganii and M. psychrotolerans have been developed. Selective primers amplified a 110 bp region of the vasD gene for M....
Tipo: Text
Palavras-chave: Histamine-producing bacteria; Tuna; Selective medium; Enterobacteriaceae; Galactokinase; Type VI secretion system.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00254/36551/35096.pdf

Seychelles tuna bulletin: Year 2009
Provedor de dados: 20
Data used to generate the tables and figures presented here are based on daily catch and effort forms (logbooks) returned from fishing vessels that are licensed to fish in the Seychelles EEZ and for purse seiners, as well as from data collected via the tuna sampling programme conducted during transshipment in Port Victoria. Sometimes there are delays in these being received at SFA, especially for longliners that often spend up to a year at sea, and for purse seiners the delays are usually during and just after the second quarter of the year when most vessels are fishing in the Mozambique Channel and are not necessarily using Port Victoria for transshipment.
Tipo: Report
Palavras-chave: Purse seiners; Tuna fisheries; Catch statistics; Longlining; Tuna; Fishery data.
Ano: 2010
URL: http://hdl.handle.net/1834/5308

Le thon rouge (Thunnus thynnus thynnus L. 1758) des eaux tunisiennes  Etats des lieux, pêche et activités d’engraissement
Provedor de dados: 20
Autores: Hattour, A.
L’engraissement du thon rouge a connu un regain d’intérêt depuis le boom économique japonais i.e. vers le milieu des années 70. A cette époque les projections ont mis en évidence que la production mondiale ne suffirait plus à satisfaire le marché japonais. C’est ce constat qui a amené les grandes firmes japonaises à réfléchir sur l’engraissement du thon rouge. Cette technologie fût exportée en Espagne où l’activité a démarré effectivement au début des années 1990 pour atteindre son apogée vers les années 1996-1997. Plusieurs pays méditerranéens ont suivi le pas de l’Espagne à l’image de la Croatie, Malte, Chypre, Italie, etc., En Tunisie, pendant les six dernières années (2003-2008) l’activité d’engraissement du thon rouge (BFT) a atteint voire dépassé...
Tipo: Journal Contribution
Palavras-chave: Purse seines; Cages; Fish culture; Tuna; Environmental impact.
Ano: 2011
URL: http://hdl.handle.net/1834/4735

Biometric relationships and fattning rate of bluefin tuna "Thunnus thynnus thynnus" L. 1758 in Tunisian fish farm
Provedor de dados: 20
Autores: Hattour, A.; Moussa, A.
An analysis of data from a Tunisian farm during the months of June to November of the year 2008 is presented. These data were broken down into two sets the first concern sampled fish while towing them to farm (wild set), the second set concern sampled specimen at the end of fattening process (fattening set). The wild group comprised specimens ranging from 90 to 276 cm fork length, and the fattened group included specimens from 105 to 310 сm. Juvenile proportion (Lf&lt;130 сm) in fattened specimen (15.7%) was considerably smaller compared to the proportion in wild specimens (61,8%). The distribution of individual weights of slaughtered BFT shows the prevalence 31-50 kg specimen class (60.4%). The L-W relationships were determined for each of these sets....
Tipo: Journal Contribution
Palavras-chave: Thunnus thynnus; Tuna fisheries; Length-weight relationships; Fish farms; Tuna; Fattening.
Ano: 2012
URL: http://hdl.handle.net/1834/5315

Seychelles tuna bulletin: Year 2010
Provedor de dados: 20
Data used to generate the tables and figures presented here are based on daily catch and effort forms (logbooks) returned from fishing vessels that are licensed to fish in the Seychelles EEZ and for purse seiners, as well as from data collected via the tuna sampling programme conducted during transshipment in Port Victoria. Sometimes there are delays in these being received at SFA, especially for longliners that often spend up to a year at sea, and for purse seiners the delays are usually during and just after the second quarter of the year when most vessels are fishing in the Mozambique Channel and are not necessarily using Port Victoria for transshipment.
Tipo: Report
Palavras-chave: Tuna fisheries; Purse seiners; Catch statistics; Longlining; Fishery data; Tuna.
Ano: 2011
URL: http://hdl.handle.net/1834/5309

Seychelles tuna bulletin: Year 2011
Provedor de dados: 20
Data used to generate the tables and figures presented here are based on daily catch and effort forms (logbooks) returned from fishing vessels that are licensed to fish in the Seychelles EEZ and for purse seiners, as well as from data collected via the tuna sampling programme conducted during transshipment in Port Victoria.  Sometimes there are delays in these being received at SFA, especially for longliners that often spend up to a year at sea, and for purse seiners the delays are usually during and just after the second quarter of the year when most vessels are fishing in the Mozambique Channel and are not necessarily using Port Victoria for transshipment. Readers should note that many of the figures presented for longline fishing vessel are subject to...
Tipo: Report
Palavras-chave: Tuna fisheries; Purse seiners; Catch statistics; Longlining; Fishery data; Tuna.
Ano: 2012
URL: http://hdl.handle.net/1834/5325

Seychelles tuna bulletin: Year 2007
Provedor de dados: 20
Data used to generate the tables and figures presented here are based on daily catch and effort forms (logbooks) returned from fishing vessels that are licensed to fish in the Seychelles EEZ and for purse seiners, as well as from data collected via the tuna sampling programme conducted during transshipment in Port Victoria. Sometimes there are delays in these being received at SFA, especially for longliners that often spend up to a year at sea, and for purse seiners the delays are usually during and just after the second quarter of the year when most vessels are fishing in the Mozambique Channel and are not necessarily using Port Victoria for transshipment.
Tipo: Report
Palavras-chave: Tuna fisheries; Catch statistics; Purse seiners; Longlining; Fishery data; Tuna.
Ano: 2009
URL: http://hdl.handle.net/1834/5306

The industrial tuna fishing activity in the Western Indian Ocean: report for the year 2001
Provedor de dados: 20
Autores: Marguerite, M.A.
Tipo: Report
Palavras-chave: Fishery economics; Fishery industry; Fishery statistics; Tuna fisheries; Tuna; Fisheries.
Ano: 2002
URL: http://hdl.handle.net/1834/1316

Seychelles tuna bulletin: Year 2006
Provedor de dados: 20
Data used to generate the tables and figures presented here are based on daily catch and effort forms (logbooks) returned from fishing vessels that are licensed to fish in the Seychelles EEZ and for purse seiners, as well as from data collected via the tuna sampling programme conducted during transshipment in Port Victoria. Sometimes there are delays in these being received at SFA, especially for longliners that often spend up to a year at sea, and for purse seiners the delays are usually during and just after the second quarter of the year when most vessels are fishing in the Mozambique Channel and are not necessarily using Port Victoria for transshipment.
Tipo: Report
Palavras-chave: Tuna fisheries; Purse seiners; Catch statistics; Longlining; Tuna; Fisheries data.
Ano: 2007
URL: http://hdl.handle.net/1834/5304

Seychelles tuna bulletin: Year 2008
Provedor de dados: 20
Data used to generate the tables and figures presented here are based on daily catch and effort forms (logbooks) returned from fishing vessels that are licensed to fish in the Seychelles EEZ and for purse seiners, as well as from data collected via the tuna sampling programme conducted during transshipment in Port Victoria. Sometimes there are delays in these being received at SFA, especially for longliners that often spend up to a year at sea, and for purse seiners the delays are usually during and just after the second quarter of the year when most vessels are fishing in the Mozambique Channel and are not necessarily using Port Victoria for transshipment.
Tipo: Report
Palavras-chave: Tuna fisheries; Purse seiners; Catch statistics; Longlining; Fishery data; Tuna.
Ano: 2009
URL: http://hdl.handle.net/1834/5307

Feeding partitioning among tuna taken in surface and mid-water layers: the case of yellowfin (Thunnus albacares) and bigeye (T. obesus) in the Western Tropical Indian Ocean
Provedor de dados: 20
Autores: Sabatié, R.; Marsac, F.; Hallier, J.P.; Potier, M.; Lucas, V.; Ménard, F.
The trophic relations of two apex predators, yellowfin and bigeye tuna (Thunnus albacares and T. obesus), and their prey were investigated in the western tropical Indian Ocean. The contents of 173 non-empty stomachs were analysed from specimens caught with longlines and purse seine during scientific and fishing cruises. Diet data were processed by occurrence, by number, and by wet weight and a comparison of diets between surface and deep swimmers made. Crustaceans were the almost exclusive food source of surface-swimming bigeye tuna, with the stomatopod (Natosquilla investigatoris) being the sole prey item recorded in this category. The diet of deep-swimming yellowfin tuna was balanced between epipelagic fish, crustaceans and cephalopods. Bigeye tuna fed...
Tipo: Journal Contribution
Palavras-chave: ANALYSIS; Diets; Tuna fisheries; Analysis; Tuna; Fisheries; Http://aims.fao.org/aos/agrovoc/c_8003; Http://aims.fao.org/aos/agrovoc/c_2934.
Ano: 2004
URL: http://hdl.handle.net/1834/1091

THE IMPACT OF INVENTORY ON TUNA PRICE: AN APPLICATION OF SCALING IN THE ROTTERDAM INVERSE DEMAND SYSTEM
Provedor de dados: 31
Autores: Chiang,   Fu-Sung; Lee,   Jonq-Ying; Brown,   Mark G.
This study adopted the scaling approach to examine the impacts of inventories on tuna auction prices in Japan using the Rotterdam inverse demand system.  The inclusion of two inventory variables in the model only increases the number of parameters by two.  Results indicate that frozen tunas are more likely to be close substitutes, fresh and frozen tunas of the same species are also likely to be substitutes, and inventory had significant impacts on auction prices.
Tipo: Journal Article
Palavras-chave: Scaling; Rotterdam inverse demand system; Tuna; Inventory; Demand and Price Analysis.
Ano: 2001
URL: http://purl.umn.edu/15445

Unveiling the germination requirements for Cereus hildmannianus (Cactaceae), a potential new crop from southern and southeastern Brazil
Provedor de dados: 39
Autores: Becker,Rafael; Ri,Leandro Dal; Farias-Singer,Rosana; Singer,Rodrigo Bustos.
ABSTRACT Cereus hildmannianus K. Schum is a columnar cactus native to South and Southeast Brazil. The cultivation of this species seems justifiable for several reasons: its fruits are spineless and edible; it is not threatened with extinction; it naturally occurs in Pampa and Atlantic Forest under non-xeric conditions that may be unsuitable for the cultivation of other tropical cacti; and the plants are pollinator-dependent and so should benefit from native pollinators. This study aimed to test seed germination of C. hildmannianus with samples collected at three different localities in southern Brazil, as a necessary step preceding any attempts of management and domestication. Seeds were exposed to temperatures of 20° C, 25° C, 30° C and room temperature....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cacti; Cereus hildmannianus; Germinability; Germination; Synchronicity; Tuna.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400765

Factores Bióticos y Concentración de Ácido Carmínico en la Cochinilla (Dactylopius coccus Costa) (Homoptera: Dactylopiidae)
Provedor de dados: 113
Autores: Rodríguez,Luis C; Faúndez,Eric; Seymour,Judith; Escobar,Carlos A; Espinoza,Luis; Petroutsa,Maria; Ayres,Alejandro; Niemeyer,Hermann  M.
La cochinilla, Dactylopius coccus Costa (Homoptera: Dactylopiidae), es un insecto que crece sobre la tuna, Opuntia ficus-indica (L.) Mill. (Cactaceae), y es explotado por su capacidad para producir colorantes naturales basados en el ácido carmínico. La cochinilla fue introducida a Chile en 1989. Las exportaciones de cochinilla seca se iniciaron en 1994 y los volúmenes y montos se elevaron de manera significativa año a año, hasta alcanzar a cubrir más del 15% de la demanda mundial. Sin embargo, el precio actual de la cochinilla se acerca a los costos de producción, siendo necesario aumentar los rendimientos sin aumentar los costos. En este trabajo se describe el efecto de diversas variables bióticas sobre la concentración de ácido carmínico (CAC), la que...
Tipo: Journal article
Palavras-chave: Cochinilla; Ácido carmínico; Colorantes naturales; Tuna; Haplodiploidía; Mejoramiento genético de insectos.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000300011

Factors that determine the quality of bigeye tuna, caught in the western tropical Atlantic Ocean
Provedor de dados: 45
Autores: Nóbrega,C.C.; Mendes,P.P.; Mendes,E.S.
Tuna are highly prized in Oriental cuisine, and the bigeye tuna (Thunnus obesus) is of great commercial importance. Quality is assessed by the tuna meat quality, freshness, texture and fat, which can be altered by factors inherent to capture, such as days of onboard storage, months of the year, whether the catch was living or dead, fish weight and year. These factors were correlated to identify those that affect quality. We obtained data from nine vessels, from January 2007 to April 2010, creating an information bank of 21,908 bigeye tuna. Fish quality and parameters were related using multiple linear regression analysis, in which the variables were included in the model by a stepwise procedure (F&gt;4). We found that live catch, heavier fish and fewer...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fishing; Thunnus obesus; Tuna; Sensory analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352014000300949