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Registros recuperados: 33
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Age and growth of Hypophthalmus edentatus (Spix), (Siluriformes, Hypophthalmidae) in the Itaipu Reservoir, Paraná, Brazil Zoologia
Ambrósio,Ângela Maria; Gomes,Luiz Carlos; Agostinho,Ângelo Antônio.
Age and growth of Hypophthalmus edentatus (Spix, 1829) (Siluriformes, Hypophthalmidae) was determined. Data were collected from December 1983 to November 1984 and from April 1997 to March 1998 in the Itaipu Reservoir. To evaluate reading consistency, it was analyzed the coefficient of variation of the total length for each annulus observed in the otoliths. Through marginal increment analysis, it was determined that the annuli formed annually (April) indicating that otoliths may be used in the study of age and growth of the species. Food supply was considered the main factor affecting growth and annuli formation in both periods. Back-calculated data were used to assess if the Rosa Lee phenomenon, commom in selective samples like commercial fishing, occured....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Age; Growth; Hypophthalmus edentatus; Itaipu Reservoir; Otoliths.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752003000200002
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Age and growth of Spanish mackerel (Scomberomorus brasiliensis) off the northeastern coast of Brazil Neotropical Ichthyology
Nóbrega,Marcelo Francisco de; Lessa,Rosangela Paula.
Age and growth of the Spanish mackerel (Scomberomorus brasiliensis) caught off northeastern Brazil were determined. A total of 831 otoliths were examined - 296 from males (12 - 75 cm FL), 212 from females (11.5 - 72 cm FL) and 323 from specimens of undetermined sex (12.4 - 75 cm FL). There was a high percentage of juveniles in the catches, resulting mainly from the use of gillnets. Marginal increment analysis of the otoliths indicated that the shortest distances from the last ring to the edge occurred from November to May, laying down just one ring annually. One to eight rings were found, with specimen lengths ranging from 11.5 to 75.8 cm. The Schunute model was used to determine what model was best fit the data, demonstrating that the specialized von...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Otoliths; Scombridae; Neritic species.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400016
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Age and growth of the dog snapper Lutjanus jocu (Bloch & Schneider, 1801) in Abrolhos Bank, Northeastern Brazil Neotropical Ichthyology
Previero,Marília; Minte-Vera,Carolina V.; Freitas,Matheus Oliveira; Moura,Rodrigo Leão de; Dei Tos,Claudenice.
We determined the age and growth of the dog snapper (Lutjanus jocu), caught in the region of Abrolhos Bank, Bahia State, by the fishermen from coastal communities of Prado, Alcobaça, Caravelas, and Nova Viçosa. We examined 205 sectioned otoliths of fish caught by harpoon, longline, hand line, and gill nets (14.5 to 79.5 cm fork length). The formation of each ring was considered annual. The sectioned otoliths showed between 0 and 29 rings. Nearly half of the analyzed specimens had between 0 and 7 rings (88 of 205). Fish caught with nets in the estuarine region were the juvenile, while fish caught with lines and harpoons were the oldest. Two von Bertalanffy growth models were fitted to length-at-age data: one assuming constant variance of length-at-age (SVB)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lutjanidae; Otoliths; Reef fisheries.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200017
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Age estimation and growth of some deep-sea fish from the northeast Atlantic ocean ArchiMer
Allain, Valerie; Lorance, Pascal.
Age is a necessary parameter used in population dynamics to assess the state of exploited resources. This parameter is poorly known for most deep-sea species (depth > 400 m). This work focused on age estimation from otoliths of Alepocephalus bairdii (Alepocephalidae), Coryphaenoides rupestris (Macrouridae), Helicolenus dactylopterus (Sebastidae) and Hoplostethus atlanticus (Trachichthyidae), which French fishery exploitation, off the west coasts of the British Isles, began the late 1980's. Considering otolith growth zones as annual, the four species all show high longevity: 38, 54, 43 and 130 years, respectively, together with slow growth. The differences in growth between sex were estimated and difficulties in accurately estimating the age were...
Tipo: Text Palavras-chave: Alepocephalus bairdii; Coryphaenoides rupestris; Helicolenus dactylopterus; Hoplostethus atlanticus; ANE; Slope fish; Age estimation; Otoliths.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00000/10396/7690.pdf
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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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Biologie de l'anchois (<Engraulis encrasicolus>) en Mauritanie OceanDocs
Ba, I.S..
L’étude du cycle sexuel de l’Anchois montre que la principale période de reproduction s’étend d’avril à octobre. Celle-ci serait sous la dépendance principale de l’élévation de la température de surface. La croissance, abordée à l’aide des marques supposées journalières sur les otolithes, donne des résultats jugés satisfaisants jusqu’à 10 cm L.F. Par contre, ceux concernant les tailles supérieures devront être confirmés.
Tipo: Journal Contribution Palavras-chave: Biology; Growth; Otoliths; Sexual maturity; Sexual reproduction; Growth; Otoliths; Biology; Sexual maturity; Sexual reproduction; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_925; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_26876.
Ano: 1989 URL: http://hdl.handle.net/1834/1146
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Características morfológicas y morfométricas de los otolitos de tres especies de pejerrey de la costa marplatense OceanDocs
Aloisi, P.N..
Realizado en el INIDEP (Instituto Nacional de Investigación y Desarrrollo Pesquero- Mar del Plata, Argentina)
Tipo: Theses and Dissertations Palavras-chave: Otoliths; Otoliths; Http://aims.fao.org/aos/agrovoc/c_27091.
Ano: 1990 URL: http://hdl.handle.net/1834/3552
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Déclin de la taille-aux-âges des sardines (Sardina pilchardus) : diminution de la croissance et/ou disparition sélective des individus à croissance rapide ArchiMer
Gentil, Claire.
In many exploited species, we see a decrease of size-at-ages. Two main hypotheses have been proposed to explain this decline: a decline in growth and the selective mortality of the individuals with fast growth both being due to environmental changes or/and to fishing. The sardine Sardina pilchardus of the Bay of Biscay is a good model for the study of this phenomenon because of its high sensitivity to the environmental variations and it sustains two large French and Spanish fisheries. The aim of this study is to measure the changes in the growth of sardines, by the reading of otoliths, and to understand mechanisms involved in this process. The main stages of this study are described in this report: extraction of otoliths during PELGAS, otoliths...
Tipo: Text Palavras-chave: Sardina pilchardus; Golfe de Gascogne; Otolithes; Croissance; Mortalité; Sélection; Sardina pilchardus; Bay of Biscay; Otoliths; Growth; Mortality; Selection.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00459/57038/58942.pdf
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Détermination de l'âge des chinchards (Trachurus trachurus et Trachurus trecae) de la ZEE mauritanienne par otolithométrie. OceanDocs
Mylnikov, N.; Ba, I.S..
Résumé : Cette étude traite de la détermination de l’âge des chinchards Trachurus trachurus et Trachurus trecae pêchés dans la ZEE mauritanienne de juin 1987 à décembre 1988. La méthode utilisée est celle dite de lecture directe des otolithes selon l’hypothèse : « une marque = une année ». Les paramètres de croissance estimés sont dans la plupart des cas voisins de ceux déjà obtenus sur ces deux espèces dans la région, mais restent cependant tributaires de la période et de la périodicité de formation des marques. Abstract : This work studies the age determination of horse-mackerels Trachurus trachurus and Trachurus trecae fished in Mauritanian waters from June 1987 to December 1988, using the direct reading of otoliths with the hypothesis: « One mark = one...
Tipo: Journal Contribution Palavras-chave: Otoliths; Mauritania; Trachurus trecae; Growth; Mauritanie; Horse-mackerels; Otolithes; Chinchards; Trachurus trachurus; Croissance; Horse mackerel fisheries.
Ano: 1990 URL: http://hdl.handle.net/1834/784
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Dynamique temporelle de la contribution du repeuplement en stades précoces de truite (Salmo Trutta l.) dans la population en place et dans la pêche sur le doubs franco-suisse. ArchiMer
Champigneulle, A.; Degiorgi, F.; Raymond, J. C.; Cachera, S..
The technique of otoliths fluoromarking has been used to evaluate at a large scale the practices of brown trout (Salmo trutta L.) stocking (540 000 - 570 000/year, most of them as sac fry) for three cohorts 1994-95-96 in a part of the River Doubs having a length of 40 km and fragmented in three zones (upstream, median, downstream) by three hydroelectric dams. For each of the three cohorts, there is a rather high contribution (23 to 60% according to the zone) of the stocked fry to the automnal 0+ standing population. The mass marking of all the stocked fry allowed to show that the dynamics of the contribution of the two components of recruitment (natural or stocked) differed. Indeed, the contribution of stocking decreased with time when measured in the...
Tipo: Text Palavras-chave: Salmo trutta; Repeuplement; Marquage; Otolithes; Pêche; Salmo trutta; Restocking; Marking; Otoliths; Angling.
Ano: 2002 URL: https://archimer.ifremer.fr/doc/00480/59141/61769.pdf
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Estudio de algunos aspectos del ciclo vital de la merluza de cola Macruronus magellanicus, Lonnberg, 1907. OceanDocs
Giussi, A.R..
Long tailed hake Macruronus magellanicus, is a demersal fish,distributed in the SW Atlantic Ocean, in Malvinas Current waters,from 36° and 55°S, mainly between 50m and 200m depth. The species is also distributed in Chilenian waters in the Pacific Ocean, being caught in the Magellan Strait and the Beagle Channel. Age determination was estimated with the sagittae otoliths, in which only one ring is formed during the year. Growth parameters were calculated directly and with back calculated methodology, no differences were observed between the results. Differences in growth sexes were evident from 3 years old. The oldest age observed was 13. Different distributional areas of adults through out the year could suggest a migratory movement in northern waters of...
Tipo: Theses and Dissertations Palavras-chave: Life cycle; Growth; Otoliths; Age determination; Reproduction; Population dynamics; Mortality; Population structure; Fishery surveys; Fishing grounds; Geographical distribution; Back calculation; Growth; Otoliths; Age determination; Population structure; Geographical distribution; Life cycle; Reproduction; Population dynamics; Mortality; Fishing grounds; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_6115; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_4317; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_6111; Http://aims.fao.org/aos/agrovoc/c_4945; Http://aims.fao.org/aos/agrovoc/c_2947.
Ano: 1996 URL: http://hdl.handle.net/1834/1488
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Estudio de la edad y crecimiento del recurso merluza común (Merluccius hubbsi) durante el período 1968-1970; determinación de las fluctuaciones del recurso OceanDocs
Villarino, M.F..
La merluza común (Merluccius hubbsi) es uno de los más importantes recursos pesqueros del Mar Argentino. Constituye aproximadamente el 68 por ciento de las capturas desembarcadas, según lo indicado por las estadísticas oficiales (Boletín Oficial, Subsecretaría de Pesca, 1988). Su explotación ha mantenido una tendencia creciente a partir de 1974, como consecuencia del incremento de las capturas de Argentina y el plan de desarrollo pesquero implementado por Uruguay. Las capturas de 1978 y 1979 superaron ampliamente el valor del rendimiento máximo sostenible, estimado en 344.000 toneladas (Verazay y Otero, 1986), y se mantienen próximas al mismo a partir del último año mencionado.Como resultado de esta explotación el recurso pesquero se redujo aproximadamente...
Tipo: Theses and Dissertations Palavras-chave: Age determination; Otoliths; Growth.
Ano: 1990 URL: http://hdl.handle.net/1834/5027
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Estudio de la morfometría de las sagittae en poblaciones de sciaenidos marinos de aguas cálidas del Perú y aguas templado-frías de Argentina OceanDocs
Volpedo, A..
Otoliths (sagitta, asteriscus and lapillus)are complex structures composed of calcium carbonate, other minerals, and a protein matrix. Otoliths are located in the internal ear of the teleost fishes. The shape and structure of otoliths are specific for each species. For this reason, otoliths are used to identify species in biological and ecological studies.Sciaenids conform a group of fishes of commercial importance, so the handling of this resource is a high-priority topic for the local and national economies of countries that exploit these species. The purpose of this work is to study different aspects of the sagittae of marine sciaenids from Argentina and Peru. The morphology, morphometry and chemical composition has been analyzed in relation to the...
Tipo: Theses and Dissertations Palavras-chave: Otoliths; Morphometry; Identification keys; Indicator species; Dimensions; Trace metals; Environmental factors; Stocks; Coastal fisheries; Otoliths; Dimensions; Environmental factors; Stocks; Indicator species; Coastal fisheries; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_2283; Http://aims.fao.org/aos/agrovoc/c_2594; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_35790; Http://aims.fao.org/aos/agrovoc/c_1696.
Ano: 2001 URL: http://hdl.handle.net/1834/3132
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Estudio preliminar sobre la estructura de edades y el crecimiento de la pescadilla de red (Cynoscion guatucupa, Pisces, Sciaenidae) en el área sur de la provincia de Buenos Aires OceanDocs
Ruarte, C.O.; Sáez, M.B..
Otoliths reading of specimens derived from research cruises carried out in the south of the Province of Buenos Aires (39°S-41°S), Argentine Sea, in 1998 and 1999 allowed to determine stripped weakfish (Cynoscion guatucupa, Pisces, Sciaenidae) age and growth.
Tipo: Journal Contribution Palavras-chave: Age determination; Growth; Otoliths; Age determination; Growth; Otoliths; Http://aims.fao.org/aos/agrovoc/c_24110; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091.
Ano: 2008 URL: http://hdl.handle.net/1834/3144
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Estudios sobre la edad y crecimiento de la Palma Calamus brachysomus (Lockington) (Pisces: Sparidae) en aguas ecuatorianas OceanDocs
Martínez, J..
342 specimens of sparid Calamus brachysomus ”Palma”, collected during a demersal trawl survey by the R. V. Tohallí in April and May1983, were examined. The different techniques used to prepare scales and otoliths for ageing are described and analysed. The otoliths were determined to be the most reliable for ageing studies; 87% of otoliths were readable. The rings observed were assumed to be annual. The mean lengths at age were used to determine the parameters of the Von Bertalanffy growth formula, giving: Lt=50.13(1-e-0.1473(t+2.0704)). The growth curve obtained must be considered provisional due to possible biases in the interpretation of the otoliths, and also due to those arising from the selectivity of the fishing gear.
Tipo: Journal Contribution Palavras-chave: Demersal fisheries; Age; Growth; Growth curves; Otoliths; Otolith reading; Demersal fisheries; Growth; Otoliths; Age; Http://aims.fao.org/aos/agrovoc/c_2173; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_27091; Http://aims.fao.org/aos/agrovoc/c_186.
Ano: 1985 URL: http://hdl.handle.net/1834/3226
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Evaluation of the Status of the Namibian Hake Resource (Merluccius spp.) Using Statistical Catch-at-Age Analysis OceanDocs
Kirchner, Carola; Kainge, Paul; Kathena, Johannes.
Namibian hake is the most important fish resource in Namibia. This monograph is a compilation of all the hake data, historic and recent, that has been used to inform stock assessment and management since the late 1970s. It presents the statistical catch-at-age analysis used to evaluate the state of the Namibian hake resource under different assumptions. This analysis treats the two hakes, Merluccius paradoxus and M. capensis, as a single stock. The data and modeling show that the stock has not as yet recovered to its maximum sustainable yield level, despite foreign fishing effort having been removed in 1990. Best estimates suggest the current stock to be roughly 20% of pre-exploitation levels; however this figure is sensitive to model assumptions. Signs...
Tipo: Book Section Palavras-chave: Stock assessment; Gadoid fisheries; Data; Dynamics; Surveys; Commercial species; Total allowable catch; Biomass; Trawls; Otoliths; Fishing mortality; Fisheries management; Reproductive system.
Ano: 2012 URL: http://hdl.handle.net/1834/5166
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Growth, condition and metal concentration in juveniles of two Diplodus species in ports ArchiMer
Bouchoucha, Marc; Brach-papa, Christophe; Gonzalez, Jean-louis; Lenfant, P.; Darnaude, A. M..
High abundances of juvenile fish in certain ports suggest they might provide alternative nursery habitats for several species. To further investigate this possibility, post-settlement growth, metal uptake and body condition were estimated in 127 juveniles of two seabream species, collected in 2014–15, inside and outside the highly polluted ports of the Bay of Toulon. This showed that differences in local pollution levels (here in Hg, Cu, Pb and Zn) are not consistently mirrored within fish flesh. Muscle metal concentrations, below sanitary thresholds for both species, were higher in ports for Cu, Pb and V only. Otherwise, fish muscle composition principally differed by species or by year. Juvenile growth and condition were equivalent at all sites. Higher...
Tipo: Text Palavras-chave: Coastal areas; Nursery habitats; Fish; Contamination; Otoliths.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00408/51932/52609.pdf
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Growth of an Inshore Antarctic fish, Trematomus newnesi (Nototheniidae), off Adelie Land ArchiMer
Mahe, Kelig; Elleboode, Romain; Loots, Christophe; Koubbi, Philippe.
Dusky rockcod, Trematomus newnesi, is a widely distributed neritic circumpolar Antarctic fish species. We conducted a study on age and growth of Trematomus newnesi in coastal waters of Adélie Land in East Antarctica. A total of 289 specimens were collected in 2003, 2005, 2006 and 2009. They consisted of 122 females, 132 males and 35 immature specimens. Total length (TL) and total weight (W) of these fish ranged from 13.5 to 25 cm and 19.7 to 174 g respectively for females and from 12 to 20.9 cm and from 24.1 to 144.1 g for males. The TL/W relationship was described by the following parameters: a=7.2.10-3 and b=3.127, showing no significant difference between sex (ANCOVA, P<0.05). Fish age was estimated by counting annual growth increments on polished...
Tipo: Text Palavras-chave: Antarctic fish; Trematomus newnesi; Otoliths; Growth; Age; Adelie land.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00333/44440/44156.pdf
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Habitat discrimination of big-scale sand smelt Atherina boyeri Risso, 1810 (Atheriniformes: Atherinidae) in eastern Algeria using somatic morphology and otolith shape ArchiMer
Boudinar, A. S.; Chaoui, L.; Mahe, Kelig; Cachera, M.; Kara, M. H..
Somatic morphology and otolith shape were used to discriminate four samples of Atherina boyeri from three different habitats: Mellah lagoon (n = 269), Annaba Gulf (144 punctuated and 194 unpunctuated individuals) and Ziama inlet (n = 147) in eastern Algeria. For each individual, somatic morphology was described with 13 metrics and eight meristic measurements, while the otolith contour shape of 452 individuals from the three habitats was analysed using Fourier analysis. Then, two discriminant analyses, one using the 13 metric measurements and the other using Fourier descriptors, were used in order to discriminate populations of A. boyeri. The results of the discriminant analyses based on the two methods were similar, and showed that this species could be...
Tipo: Text Palavras-chave: Sand smelt; Otoliths; Morphology; Mediterranean; Algeria.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00270/38079/36303.pdf
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Habitat selection and phenotypic diversity in the anchovy of the Bay of Biscay ArchiMer
Petitgas, Pierre; Grellier, Patrick; Leseur, Floriane; Lenfant, Philippe.
Diversity among individuals in a population is an important feature linking vital rates with behaviour and spatial occupation. We measured the growth increments in the otolith of individual fishes collected on the annual fisheries survey PELGAS from 2001 to 2015. Individuals who grew larger at juvenile stage occupied later in life more off-shore habitats. Further, we analysed the allozymes of 13 different loci from 2001 to 2006. Alleles of the enzyme IDH showed different frequencies in inshore and offshore habitats. The population spatially segregates along a coast to off-shore gradient with individuals showing different early growth and allele frequencies. Results show how individuals in a population segregate spatially in different habitats in relation...
Tipo: Text Palavras-chave: Allozymes; Otoliths; Habitats; Spatial distribution; Anchovy.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00353/46379/46001.pdf
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