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| Registros recuperados: 33 | |
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| 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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| 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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| 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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| Panfili, Jacques; De Pontual, Helene; Troadec, Herve; Wrigh, Peter J.. |
| Sclerochronology, the study of calcified structures to reconstruct the past history of living organisms, is central to fish biology and fisheries management. This manual aims to provide an overview of the current theoretical and practical aspects of sclerochronological studies. By providing information on the nature of calcified structures (otoliths, scales, skeleton), their uses in fish research and methods for preparation and examination, the manual constitutes a comprehensive guide for researchers, technicians and students either new to the field or interested in expanding their range of expertise. The enclosed multimedia version (DVD) is supplemented by videos illustrating the main technical procedures with an alternative navigation mode based on... |
| Tipo: Text |
Palavras-chave: Age; Age determination; Biological aging; Chemistry; Growth; Otolith reading; Otoliths; Scale reading; Scales; Skeleton. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00017/12801/9742.pdf |
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| 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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| 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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| Petitgas, Pierre; Grellier, Patrick; Duhamel, Erwan; Masse, Jacques; Doray, Mathieu. |
| Individual fish growth depends on internal population factors such as phenotypic variability as well as external factors such as past environmental conditions (temperature, food) and selective mortality (predation or fishing). In the anchovy, growth in the first year is key to population dynamics as it determines the potential energy allocated to reproduction as well as the capacity to occupy off-shore habitats. Further, in the recent past, the anchovy in the bay of Biscay has experienced collapse and recovery and the role played by growth in this history is unknown. Since 2001 with the spring acoustic survey series PelGas, we have monitored individual fish growth by measuring in the otolith the increments between annual rings, in addition to age... |
| Tipo: Text |
Palavras-chave: Anchovy; Biscay; Otoliths; Growth; Metapopulation. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00114/22550/20236.pdf |
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| 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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| 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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| Pérez,Alfredo; Fabré,Nidia Noemí. |
| ABSTRACT The tiger shovelnose catfish (Pseudoplatystoma metaense) identified in literature prior to 2007 as P. tigrinum is the most important catfish species in the Orinoco River fishery, because of its abundance and high market price. The aim of this study was to obtain age, growth and population parameters of the of tiger shovelnose catfish. A total of 2,183 catfish, were sampled during 1996-2003 from the commercial fishery of the northwestern Orinoco River Basin in Venezuela, and were aged by examination of otoliths. Validation of otolith annuli was achieved with marginal increment analysis. Results suggest that, the opaque and translucent zones of otoliths were formed once per year. Length-weight relation and the von Bertalanffy growth model parameters... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Age; Growth; Otoliths; Overfishing; Venezuela. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100209 |
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| 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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| 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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| Brown, D.R.; Leonarduzzi, E.; Averbuj, A.; Livore, J.P.. |
| Argentine anchovy (Engraulis anchoita) eggs and larvae abundance distribution patterns in the Argentine northpatagonian littoral during January-April 2001 were analyzed. As the season progressed, a process of decline in the reproductive activity was observed. Larval growth and mortality rates were established. Age determinations were performed analyzing otoliths daily increments. The 0.43 mm day-1 growth rate average did not show space-time differences, fact attributed to the homogeneity of the thermal field. The 0.32 d-1 January natural mortality rate was determined by exponential decline. Mortality rates, estimated with the mortality-aggregation model, were considered dependent on the larval size. The value ranges (d-1) were 0.07-0.49, 0.05-0.61 and... |
| Tipo: Journal Contribution |
Palavras-chave: Fish larvae; Growth; Otoliths; Mortality. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5500 |
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| Registros recuperados: 33 | |
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