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Registros recuperados: 17
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Análisis de la unidad poblacional de la merluza de cola (Macruronus magellanicus). Estudio de las variaciones morfológicas somáticas y de los otolitos en relación con su distribución geográfica OceanDocs
Jerez, B.; Hernández, D.R.; Giussi, A.R.; Malaspina, A.M..
To determine the existence of different population units of longtail hake (Macruronus magellanicus) of the Argentine Sea, the meristic and morphometric characters of 861 specimens from two different areas were studied measuring 24 body distances with the landmark methods. Besides, the relation among weight, width and thickness of 806 pairs of sagittae otoliths as a function of length and sex of individuals was analyzed. Using the General Linear Model, the Principal Component Analysis and the Multivariate Analysis of Variance the fitted morphometric variables, the meristic characters and their relation to the Area and Sex factors were assessed. The variability observed does not show any conclusive evidence about the existence of more than one stock in the...
Tipo: Journal Contribution Palavras-chave: Stock identification; Meristic counts; Morphometry; Otoliths.
Ano: 2013 URL: http://hdl.handle.net/1834/5490
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Analyse démographique des captures de thon rouge et de la thonine des madragues Tunisiennes OceanDocs
Hattour, A..
The temporal evolution of the demographic structure of bluefin tuna (Thunnus thynnus, Linnaeus 1758) and of the little tuna (Euthynnus alletteratus, Rafinesque 1810) by the Tunisian traps of Sidi Daoud and Monastir is studied during 3 periods (1979-1983; 1988-1992 and 1993-1997). This survey showed the two points of passive capture landing draw the bluefin tuna from two populations of different composition. The fish taken from Tunisian waters do not from a homogenous group of similar beings, since they result from a mixture of local Mediterrean and Atlantic forms. This conclusion was arrived at by Heldt (1929), and confirmed in 2004, by displacement studies indicated that, after reproduction, the adults (<100kg) remained in the Mediterranean, and that,...
Tipo: Journal Contribution Palavras-chave: Euthynnus alletteratus Thunnus thynnus; Population structure; Trap nets; Stock identification; Tuna fisheries; Population structure; Http://aims.fao.org/aos/agrovoc/c_6115.
Ano: 2004 URL: http://hdl.handle.net/1834/4235
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Avances en métodos y tecnología aplicados a la investigación pesquera. Seminario final del Proyecto INIDEP-JICA sobre evaluación y monitoreo de recursos pesqueros 1994-1999 OceanDocs
The Seminar organized by the Japan International Cooperation Agency (JICA) and the National Institute for Fisheries Research and Development (INIDEP) of Argentina, was held at INIDEP, Mar del Plata from September 6-9, 1999. The publication comprises expanded abstracts of each presentation, in four Theme Sessions: Reproduction and Survival, Age and Growth, Stock Identifcation and Resource Management Techniques and Relation between Oceanographic and Fishing Conditions. Presentations focused mainly on the following marine resources: squids Illex argentinus and Loligo sanpaulensis; and fish species southern blue whiting Micromesistius australis, patagonian hoki Macruronus magellanicus, kingklip Genypterus blacodes, patagonian toothfish Dissostichus...
Tipo: Book Palavras-chave: International cooperation; Research programmes; Fishery resources; Reproduction; Survival; Growth; Age determination; Fishery management; Population structure; Stock identification; Mesh selectivity; Satellite sensing.
Ano: 1999 URL: http://hdl.handle.net/1834/5510
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Características poblacionales de la anchoíta (Engraulis anchoita)del Mar Argentino. Parte I. El largo medio al primer año de vida, crecimiento y mortalidad OceanDocs
Hansen, J.E.; Cousseau, M.B.; Gru, D.L..
A total of 7263 otoliths were collected from anchovy samples taken during two pelagic cruises which were carried out in the Spring of 1978. An statistical analysis of back calculated length distributions of one-year-old fish (L1)was made. The L1 mean values taken by geographical latitude form a cline, with higher values in the northern samples, and decreasing Southwards. Within this latitudinal gradient two main anchovy populations can be identified, one in the region of Buenos Aires Province and the other in Patagonian waters. The L1 of the females is significatively larger than that of the males for the former population, whereas in the Patagonian area differences between sexes are not significant. The parameters of the von Bertalanffy Growth curves, as...
Tipo: Journal Contribution Palavras-chave: Stock identification; Otolith reading; Growth curves; Mortality; Mortality; Http://aims.fao.org/aos/agrovoc/c_4945.
Ano: 1984 URL: http://hdl.handle.net/1834/2043
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Crecimiento de la merluza (Merluccius hubbsi) del Atlántico sudoccidental entre 1993-2003 al norte y sur de 41º S OceanDocs
Renzi, M.A.; Santos, B.A.; Abachian, V..
The reading of otoliths sagittae collected during the INIDEP (National Institute for Fisheries Research and Development, Argentina) assessment cruises carried out in the 1993-2003 period allowed to estimate length and weight growth parameters and the condition factor of hake (Merluccius hubbsi) and to prospect the two management units of the species north and south of 41ºS (Argentine Sea, SW Atlantic). A great variability in total length and weight in each age group was observed; nevertheless, stable mean length and weight values per age group were observed in the period analyzed. Besides, the values estimated to determine possible growth variations in each and between both management units north and south of 41ºS were compared. The comparison of growth...
Tipo: Journal Contribution Palavras-chave: Growth curves; Stock identification; Condition factor; Marine environment; Marine environment; Http://aims.fao.org/aos/agrovoc/c_4610.
Ano: 2009 URL: http://hdl.handle.net/1834/3458
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Directional bilateral asymmetry in otolith morphology may affect fish stock discrimination based on otolith shape analysis ArchiMer
Mahe, Kelig; Ider, Djamila; Massaro, Andrea; Hamed, Oussama; Jurado-ruzafa, Alba; Goncalves, Patricia; Anastasopoulou, Aiketerini; Jadaud, Angelique; Mytilineou, Chryssi; Elleboode, Romain; Ramdane, Zohir; Bacha, Mahmoud; Amara, Rachid; De Pontual, Helene; Ernande, Bruno.
Otolith shape analysis is an efficient fish stock identification tool. However, most applications used left and right otoliths or only one of them arbitrarily chosen without testing for biases resulting from potential directional bilateral asymmetry (DA) in otolith shape, i.e. a unimodal population-level deviation form bilateral symmetry between right and left otolith shapes. In this study, 560 bogues (Boops boops) were sampled from 11 geographical locations from the Canary Islands to the Aegean Sea and elliptical Fourier descriptors were used to describe their otoliths’ shape. First, a significant otolith DA was observed at the global scale with an average amplitude of 2.77%. However, at the scale of sampling locations, DA was not always significant and...
Tipo: Text Palavras-chave: Boops boops; Elliptical Fourier analysis; Mediterranean Sea; Side effect; Stock identification.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00468/57967/60418.pdf
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Enclave coralligène de l'infralittoral de Korbous (nord de la Tunisie) : Aire minimale qualitative du phytobenthos et inventaire scépifique OceanDocs
Romdhane, N.; Ben Mustapha, K.; Romdhane, M. S.; El Abed, A..
دراسة التنوع البيولوجي للكائنات البحرية القاعية للشعب المرجانية « coralligène »للطابق « infralittoral » لقربص سمحت لنا للتعرف على ادنى مساحة نوعية لمثل هذه الدراسات التي تقام لاول مرة في تونس وتخص هذه الشعب.
Tipo: Journal Contribution Palavras-chave: Benthos; Comparative studies; Coral; Phytobenthos; Stock identification; Benthos; Phytobenthos; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_13337.
Ano: 2007 URL: http://hdl.handle.net/1834/4284
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Estudio comparativo de caracteres merísticos y morfométricos de la anchoíta (Engraulis anchoita) OceanDocs
Ratti, M.M..
The argentine anchovy (E.anchoita)shows a distributional area between 35° and 47°30' on the continental shelf off Argentina. This paper deals with some meristic and morphometric characters in order to test their power in separating different stocks. Those largely scattered distributions of morphologic features, which had been already pointed out other authors, make difficult to separate different stocks of this species on this basis.
Tipo: Journal Contribution Palavras-chave: Meristic counts; Stock identification.
Ano: 1986 URL: http://hdl.handle.net/1834/2026
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Estudio de edad y crecimiento de la sardina fueguina (Sprattus fuegensis)de las costas de la provincia de Santa Cruz e Islas Malvinas OceanDocs
Cousseau, M.B.; Gru, D.L..
Samples of Sardina fueguina (Sprattus fuegensis)were taken during research cruises carried out in 1974 and 1978. Length and age frequency distributions were analyzed, and von Bertalanffy growth parameters were calculated for the coastal waters of two geographical regions: Province of Santa Cruz and northern part of Malvinas Islands. Lenght and weight growth curves have been calculated for each region and each year. Marked differences have been found between gowth parameters of both regions, and the calculated values showed a good fit with the observed ones. According to these results, it is possible to assume that the sardines of both regions constitute two different populations. However, more information on the total distribution of the species will have...
Tipo: Journal Contribution Palavras-chave: Age composition; Growth curves; Stock identification; Sardine fisheries; Age composition; Http://aims.fao.org/aos/agrovoc/c_29093.
Ano: 1982 URL: http://hdl.handle.net/1834/2052
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Etude de la dynamique des systèmes d’exploitations et de l’éco biologie de la reproduction, de trois Mugilidés : <Mugil cephalus> (Linnaeus, 1758),< Liza aurata> (Perugia, 1892) et< Mugil capurrii> (Risso, 1810), analyse de leurs stratégies d’occupations des secteurs littoraux mauritaniens et de leurs possibilités d’aménagement. OceanDocs
Ould Mohamed Vall, M..
Résumé : En Mauritanie, un constat clair met en évidence une tendance de sur-exploitation « en série» des stocks à haute valeur, des Mugilidés; le mulet jaune premièrement, puis ensuite le mulet noir et le mulet doré (espèces pouvant être considérées de substitution). L’exploitation intensive du mulet jaune à partir de 1996 a conduit au ciblage du mulet noir à partir de 1998 et puis, plus récemment encore, celui du mulet doré en 2001. L’absence d’une gestion rationnelle risque de conduire, dans moins de sept ans à la quasi-disparition de ces ressources (logiquement renouvelables). C’est dans ce contexte de baisses des rendements, auquel s’ajoute la dégradation des zones littorales par l’action anthropique sans cesse croissante, que ce travail a permis...
Tipo: Theses and Dissertations Palavras-chave: Biology; Distribution; Ecological distribution; Exploitation; Abundance; Legislation; Reproduction; Stock identification; Zonal distribution; Distribution; Biology; Legislation; Reproduction.
Ano: 2004 URL: http://hdl.handle.net/1834/1226
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Genetic and morphological differentiation in the Sakura shrimp (Sergia lucens) between Japanese and Taiwanese populations Naturalis
Imai, H.; Hanamura, Y.; Cheng, J.-H..
The Sakura shrimp Sergia lucens is a remarkable meso-pelagic crustacean species, which is harvested for human consumption in restricted geographical areas of Taiwan and Japan in the northwestern Pacific. Nucleotide sequence analysis of the mitochondrial DNA control region was conducted to investigate the levels of genetic variability and differentiation between Japanese and Taiwanese populations of S. lucens. The latter half of the control region, which contained 589 nucleotide sites, was sequenced using DNA extracted from 178 individuals from the two geographical regions. Analyses yielded 162 haplotypes, and the amount of genetic variability within the populations as shown by the levels of haplotype and nucleotide diversity revealed that the two...
Tipo: Article / Letter to the editor Palavras-chave: Gene flow; Genetic diversification; Morphology; Stock identification; 42.74.
Ano: 2013 URL: http://www.repository.naturalis.nl/record/460049
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Identification biogéographique des principaux stocks exploités en Manche, relations avec ceux des régions voisines ArchiMer
Bennet, D; Casey, J; Dare, P; Dawson, W; Flatman, S; Hulme, T; Macer, C; Millner, R; Pickett, G; Vince, M; Lorance, Pascal; Souplet, A; Giret, M; Morin, Jocelyne; Berthou, A; Latrouite, Daniel; Morizur, Yvon; Bossy, S; Ozanne, S.
At present, the majority of fisheries are monitored and regulated in areas which are delineated by arbitrary ICES boundaries which do not necessarily have logical or consistent relationships with biological processes or fish movements. The biogeographical identification of Channel stocks is, therefore, an important step towards developing a rational strategy for the management of their fisheries. This synthesis is based on the wide available knowledge which has not been yet entirely exploited with the purpose of stock identification, for 25 commercially important species in the Channel. In addition, principal technics for stock identification are reviewed likewise environmental characteristics of the Channel, which represent fundamental components in...
Tipo: Text Palavras-chave: Environnement physico chimique; Méthodes d'identification; Migrations; Zones de ponte; Distribution géographique; Espèces exploitées; Identité de stock; Manche; Physical environment; Identification methods; Migrations; Spawning areas; Geographical distribution; Exploited species; Stock identification; Channel.
Ano: 1993 URL: https://archimer.ifremer.fr/doc/1993/rapport-719.pdf
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Morphological variability of the shape of striped red mullet Mullus surmuletus in relation to stock discrimination between the Bay of Biscay and the eastern English Channel ArchiMer
Mahe, Kelig; Villanueva, Ching-maria; Vaz, Sandrine; Coppin, Franck; Koubbi, Philippe; Carpentier, Andre.
Striped red mullet Mullus surmuletus L. 1758 is an economically important species in the Mediterranean Sea and in the northern Atlantic Ocean, where it is exploited from the Bay of Biscay to the southern North Sea (ICES, 2010). In Atlantic waters, there are two main areas where this species is caught, the Bay of Biscay and the eastern English Channel. This species was initially exploited by the Spanish fleets along the Spanish coast inside the Bay of Biscay. Originally considered as valuable by-catch (Marchal, 2008), the growing exploitation ofM. surmuletus and a conspicuous increase in landings in the English Channel and the southern North Sea by French, English and Dutch fleets have been observed from the 1990s onwards. This was attributed to an increase...
Tipo: Text Palavras-chave: Stock identification; Head morphology; Fish body shape; Truss model; Morphometric analysis.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00185/29587/28050.pdf
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Nematodes parásitos como indicadores biológicos en las especies Macruronus magellanicus y Merluccius hubbsi (Pisces, Gadiformes) OceanDocs
Incorvaia, I.S..
Parasites nematodes as biological tags of Macruronus magellanicus (longtail hake) and Merluccius hubbsi (hake) colleted between 34°- 55°S in the SW Atlantic were studied. Adult specimens of Hysterothylacium aduncum, Ascarophis marina and Ichthytofilaria argentinensis, and the third-stage specimens of H. aduncum, Anisakis simplex and Contracaecum aduncum were described. Histological studies showed that I. argentinensis provokes tissue reactions in the swim bladder of M. hubbsi. A wide distributional range of species can be represented by many fish populations or fishing stocks. As these can overlap in space, the proper identification of stocks is necessary for fisheries management. The parasitologic method is one currently used to determine stocks....
Tipo: Theses and Dissertations Palavras-chave: Stock identification; Parasites; Indicator species; Abundance; Histology; Marine fish.
Ano: 2002 URL: http://hdl.handle.net/1834/5030
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Numerical analysis of scale morphology to discriminate between atlantic salmon stocks ArchiMer
De Pontual, Helene; Prouzet, Patrick.
The use of an image analysis microsystem with a specially developed software enabled scale image processing, outline extraction and computation of features which are not available in the conventional approach of scale analysis. Those parameters (shape factors, moment invariants and elliptic Fourier coefficients) were introduced into a discriminant analysis process to test their usefulness in stock identification. The method was applied to European stocks originating from Norway (Etne river) and France (Elorn river). The low misclassification rate obtained indicates that this approach is particularly promising.
Tipo: Text Palavras-chave: Saumon atlantique; Écaille; Analyse numérique; Identification de stocks; Atlantic salmon; Scale; Numerical analysis; Stock identification.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00189/30066/28554.pdf
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Revisión taxonómica y análisis de los caracteres morfométricos y merísticos de la sardina fueguina (Sprattus fuegensis)Jenyns, 1842 (Pisces, Clupeidae) OceanDocs
Cousseau, M.B..
This paper is based on the study of 484 specimens collected off three different districts of Santa Cruz (Caleta Olivia, Puerto Deseado and Río Gallegos)and the northern coastal region of Malvinas Islands. The following items have been developed: -a brief description of the clupeoids present in the southern patagonic area where the sardine lives, and a key to their identification; -the updated systematic position of the species and its bibliographical references; -a description of the external morphology; -a statistical analysis of morphometric and meristic character; and geographic distribution and movements. It is possible to presume the existence of two geographically separated groups, one in the coasts off Santa Cruz Province and another around Malvinas...
Tipo: Journal Contribution Palavras-chave: Stock identification; Meristic counts; Geographical distribution; Sardine fisheries; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_5083.
Ano: 1982 URL: http://hdl.handle.net/1834/2054
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Variaciones en el número de miocélulas de la musculatura blanca de la merluza (Merlucciidae, Merluccius hubbsi), en la plataforma argentina OceanDocs
Christiansen, H.E..
This paper describes a method to discriminate different stocks of the Argentine hake (Merluccius hubbsi)based on the counting of white skeletal fibres of the trunk. A total of 713 females were examined from samples coming from a wide area of the Argentine shelf (between 34°30' and 54°00'S)which corresponds to the following systems: Uruguayan, Buenos Aires, northern, central and southern-patagonian. All results may be considered as preliminary due to the incipient nature of the information available on fibre regulation in fish.
Tipo: Journal Contribution Palavras-chave: Stock identification; Histology; Muscles; Hake fisheries; Muscles; Http://aims.fao.org/aos/agrovoc/c_5003.
Ano: 1982 URL: http://hdl.handle.net/1834/2055
Registros recuperados: 17
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