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Estimates of Annual Food Consumption/Biomass Ratio (Q/B) from the Fish Fauna of a Mangrove Estuary in North Brazil

DOI: http://dx.doi.org/10.18561/2179-5746/biotaamazonia.v3n2p149-154

http://periodicos.unifap.br/index.php/biota/index 

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Tommaso Giarrizzo, Daniel Ferraz & Victoria Isaac

 

Abstract: To contribute to mass balanced trophic model parametrization, estimates of annual food consumption/biomass ratio (Q/B) were compiled for 37 selected fish species of the Curuçá Estuary in Northern Brazil using an empirical model. Samples were taken bimonthly between July 2003 and July 2004 in the main channel and intertidal creeks using an otter trawl and a fyke net, respectively. The aspect ratio of the caudal fin varied between 0.8 for Poecilia vivipara and 4.6 for Sciades herzbergii and the Q/B ranged from 2.3 for Epinephelus itajara to 67.3 for Cetengraulis edentulus. This study represents the first reference available on Q/B values of 29 fish species. This compilation of Q/B ratio presented here should be useful for construction of Ecopath models particularly in tropical conditions.

Key words: consumption/biomass; aspect ratio; trophic models; Ecopath.

 

Resumo: Para contribuir para a construção de um modelo de balanço trófico, as estimativas das relações de consumo de alimentos por unidade de biomassa (Q/B) foram compiladas para 37 espécies de peixes do estuário do Curuçá selecionados no Norte do Brasil usando um modelo empírico. As amostras foram coletadas bimestralmente entre Julho de 2003 e Julho de 2004 no canal principal e áreas intertidais usando uma rede de arrasto modelo “otter trawl” e uma rede “fyke”, respectivamente. O aspect ratio da nadadeira caudal variou entre 0,8 para Poecilia vivipara e 4,6 para Sciades herzbergii e o Q/B variou de 2,3 para Epinephelus itajara para 67,3 para Cetengraulis edentulus. Este estudo representa a primeira referência disponível dos valores de Q/B para 29 espécies de peixes. Esta compilação de Q/B deveria ser utilizada para a construção de modelos de Ecopath específicos para condições tropicais.

Palavras-chave: consumo/biomassa; aspect ratio; modelo trófico; ictiofauna; Ecopath.

 

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