Assessing the stocks of the primary snappers caught in Northeastern Brazilian Reef Systems. 2-A multi-fleet age-structured approach

Frédou, Thierry; Ferreira, Beatrice Padovani; Letourneur, Yves

doi:10.1016/j.fishres.2009.05.009

Cited by 29 publications

(20 citation statements)

References 13 publications

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“…Traditional singlespecies stock assessment could be further extended to incorporate technical interactions that would refine the assessment outcome given the highly technologically stratified system of the Northeastern Brazil fishery (Frédou et al, 2006). The companion paper (Frédou et al, 2009) explores these aspects and will discuss the associated advantages and drawbacks.…”

Section: Discussionmentioning

confidence: 99%

“…In this study, the following model classes were used: (1) virtual population analysis (VPA), also called cohort analysis, which calculates stock size based on catches and assumes that the observed catches are known without error (Hilborn and Walters, 1992) by using an iterative analytical method instead of minimum likelihood criteria (this paper); and (2) 'statistical catch-at-age methods' relying on formal statistical models that require the model to be fitted by a minimisation routine (companion paper, Frédou et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Assessing the stocks of the primary snappers caught in Northeastern Brazilian reef systems. 1: Traditional modelling approaches

2009

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing the stocks of the primary snappers caught in Northeastern Brazilian reef systems. 1: Traditional modelling approaches

2009

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“…The region comprises the largest and richest coralline reefs in the South Atlantic (Leão et al, 2003), with nearly 300 species of fish and 20 species of reef building corals, as well as an extensive mosaic of algal bottoms, mangrove forests, beaches, and vegetated sandbanks. Nearly 20,000 artisanal fishermen operate in the Abrolhos Bank, but the region's fisheries are poorly known and were not included in recent revisions of reef fisheries in Northeastern Brazil (Frédou et al, 2009a(Frédou et al, , 2009b.…”

Section: Methodsmentioning

confidence: 99%

Age and growth of the dog snapper Lutjanus jocu (Bloch & Schneider, 1801) in Abrolhos Bank, Northeastern Brazil

et al. 2011

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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) and another assuming constant coefficient of variation, i.e. variance increasing as a function of average size (CVVB). The SVB estimates were Loo = 87.82 cm, K = 0.10, and t0 = -1.486 and the CVVB estimates were Loo = 117.60 cm, K = 0.06, and t0 = -2.470. The largest Loo values estimated by the CVVB model are supported by reports from the literature of larger animals occurring in the deeper outer shelf of Abrolhos Bank. Growth parameters were also estimated for males and females separately (SVB model) (Loo = 92.80 cm, K = 0.099, and t0 = -1.680 for males, and Loo = 82.10 cm, K = 0.105, and t0 = -1.570 for females).

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“…Additionally, the economic importance of snappers has led them to a status of exploited populations [14]. After consulting the federal legislation of IBAMA (http://www.pescamadora.com.br/peixes_agua_salgada/tamanho_minimos_peixes_agua_salgada.pdf) we did not find any minimum threshold for catching snappers (Lutjanidae) in Brazil.…”

Section: Discussionmentioning

confidence: 83%

Ethnobiology of snappers (Lutjanidae): target species and suggestions for management

Begossi

Salivonchyk

Araujo

et al. 2011

J Ethnobiology Ethnomedicine

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In this study, we sought to investigate the biology (diet and reproduction) and ethnobiology (fishers knowledge and fishing spots used to catch snappers) of five species of snappers (Lutjanidae), including Lutjanus analis, Lutjanus synagris, Lutjanus vivanus, Ocyurus chrysurus, and Romboplites saliens at five sites along the northeast (Riacho Doce, Maceió in Alagoas State, and Porto do Sauípe, Entre Rios at Bahia State) and the southeast (SE) Brazilian coast (Paraty and Rio de Janeiro cities at Rio de Janeiro State, and Bertioga, at São Paulo State.). We collected 288 snappers and interviewed 86 fishermen. The stomach contents of each fish were examined and macroscopic gonad analysis was performed. Snappers are very important for the fisheries of NE Brazil, and our results indicated that some populations, such as mutton snapper (L. analis) and lane snapper (L. synagris), are being caught when they are too young, at early juvenile stages. Local knowledge has been shown to be a powerful tool for determining appropriate policies regarding management of target species, and artisanal fishermen can be included in management processes. Other suggestions for managing the fisheries are discussed, including proposals that could provide motivation for artisanal fishermen to participate in programs to conserve resources, such as co-management approaches that utilize local knowledge, the establishment of fishing seasons, and compensation of fishermen, through 'payment for environmental services'. These suggestions may enhance the participation of local artisanal fishermen in moving to a more realistic and less top-down management approach of the fish population.

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Assessing the stocks of the primary snappers caught in Northeastern Brazilian Reef Systems. 2-A multi-fleet age-structured approach

Cited by 29 publications

References 13 publications

Assessing the stocks of the primary snappers caught in Northeastern Brazilian reef systems. 1: Traditional modelling approaches

Assessing the stocks of the primary snappers caught in Northeastern Brazilian reef systems. 1: Traditional modelling approaches

Age and growth of the dog snapper Lutjanus jocu (Bloch & Schneider, 1801) in Abrolhos Bank, Northeastern Brazil

Ethnobiology of snappers (Lutjanidae): target species and suggestions for management

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