Ocorrência de Alevinos de Piramutaba (Brachyplatystoma vaillantii) na Baía de Marajó

Barthem, Ronaldo Borges

doi:10.1590/1809-43921984142324

Cited by 5 publications

(4 citation statements)

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“…Many hard structures have been used to determine the age of pimelodidae. Among these, otoliths, vertebrae, and fin-spines are the structures that have produced the best results (Fenerich et al, 1975;Barthem, 1990;Muñoz-Sosa, 1996;Rêgo et al, 1998;Pérez Lozáno, 1999;Loubens & Panfili, 2000;Alonso, 2002;Mateus & Petrere, 2004). Although few studies compare the age determined by various structures of the same sample, preliminary data indicate that age underestimations tend to result when based on pectoral fin-spines in comparison with those based on dorsal spines (Layher, 1981) and vertebrae (Clay, 1982).…”

Section: Discussionmentioning

confidence: 99%

Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal

2004

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The porthole shovelnose catfish, Hemisorubim platyrhynchos, is the sixth largest pimelodidae of the Pantanal. Its age and growth were studied using pectoral fin-spines from fish collected in the Cuiabá river basin, Pantanal. The fish, which came from commercial and experimental fisheries, were all caught with hook and line. Growth-ring formation time could not be defined through the Kruskal-Wallis test on marginal increment (H = 4.142; p = 0.247). Nevertheless, decrease in the marginal increment index occurring as waters recede suggests this as the probable time when growth rings form. Estimation of the parameters of von Bertalanffy growth curve, adjusted through nonlinear regression to observed fork lengths, with L(infinity) fixed at 64 cm, were: k = 0.222 year(-1); t(o) = -2.149 years. Individual life span was estimated at 11.4 years. The results suggest that fork length is a good predictor of age for individuals of this species.

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Section: Discussionmentioning

confidence: 99%

Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal

2004

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“…The transport and dispersion of this catfish genus' larvae occur in the deep layers of the river Solimões/Amazonas main channel (Leite et al, 2007), and that ensures a higher probability for these individuals to reach feeding and growth areas in the estuary, as proposed by Barthem (1984) and Barthem & Goulding (1997). Unfortunately, there is little information about the downward migration processes of these eggs and larvae in the river channel.…”

Section: Ichthyoplankton Distribution and Its Relationship With Migratory Dynamicsmentioning

confidence: 98%

Ichthyoplankton studies as referential for the management and monitoring of fishery resources in the Brazilian Amazon basin

et al. 2020

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Studies on ichthyoplankton ecology become essential when one realizes the importance and influence of this component in dynamics, conservation, and maintenance of fishery resources. However, ecological information about this subject is still scarce and has not been properly valued and used by environmental managers and decision-makers. In this study, we present the state of the art of research on ichthyoplankton in the Amazon region. The number of studies has been increasing over time but they are scarce and restricted. We hope this study may encourage research related to ichthyoplankton in the Amazon region.

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“…As a result, since the 1990s both the quantity and the quality of catch in the region are decreasing. Stocks of some of the most traditional species, such as the "pirarucu", "tambaqui" (Colossoma macropomum), and the catfish "piramutaba" (Brachyplatystoma vaillantii) are now suffering a fishing-down process (Castello et al, 2011a;Castello & Stewart, 2010;Isaac et al, 1998;Welcomme, 1999;Isaac & Ruffino, 1996;Barthem & Petrere, 1995;Neves, 1995;Barthem, 1990). In addition, stocks of regionally important species such as the small catfish "mandi" (Pimelodus cf.…”

Section: Geographical and Institutional Settingsmentioning

confidence: 99%

Agora Sob Nova Administração: Acordos De Pesca Nas Várzeas Da Amazônia Brasileira

2015

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A pesca fica prejudicada quando as várzeas sofrem crescentes pressões de infraestrutura, poluição, mudanças climáticas e sobrepesca. Para comunidades ribeirinhas da Amazônia, isso pode significar menos peixes nos rios e lagos, o que leva a bolsos e estômagos vazios. Este artigo usa a teoria dos recursos comuns para analisar as origens e o funcionamento dos acordos coletivos de pesca assinados por habitantes das várzeas da Amazônia brasileira. Como a pesca comercial se expandiu em meados dos anos 1990, as experiências envolvendo lagos geridos pelas comunidades locais surgiram em vários locais, como um exemplo promissor de gestão participativa de base. Os resultados mostram que os acordos geraram melhorias consideráveis, embora a sua eficácia esteja ameaçada pela fraqueza do monitoramento e da fiscalização e pela falta de eficácia da regulamentação da posse da terra. O artigo sugere que as agências governamentais devem apoiar estes acordos por meio do desenvolvimento (ou adaptação) dos mecanismos que visam a descentralização das decisões públicas e da gestão. O fracasso deles pode levar a mudanças nos processos ecológicos, à redução dos estoques pesqueiros e a conflitos sócio-ambientais.

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Ocorrência de Alevinos de Piramutaba (Brachyplatystoma vaillantii) na Baía de Marajó

Cited by 5 publications

References 0 publications

Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal

Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal

Ichthyoplankton studies as referential for the management and monitoring of fishery resources in the Brazilian Amazon basin

Agora Sob Nova Administração: Acordos De Pesca Nas Várzeas Da Amazônia Brasileira

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