Estimativa do tamanho de estoques pesqueiros da Amazônia baseada em dados de captura e esforço
DOI:
https://doi.org/10.37002/biodiversidadebrasileira.v7i1.617Keywords:
Amazon, fishing, catchability, aquatic biodiversityAbstract
Fishing is an activity that demands the practical application of theories of population ecology,
and correctly estimating the size of fish stocks is fundamental for them to be managed correctly. For this, one of the fundamental parameters is the catchability (q), but it has often been considered a constant parameter, which can lead to erroneous evaluations both for the fishing potential and the state of conservation of these populations. This work aims to use a catch – and effort – based method to deal with the potential variability of the catchability of some commercial fish species in the Amazon in order to estimate the size of their stocks and their levels of exploitation. The catchability coefficient values found for the species studied (Colossoma macropomum, Semaprochilodus spp., Prochilodus nigricans, Triportheus spp., Brycon spp., Myleus spp., Mylossoma spp., Hypophthalmus spp., Brachyplatystoma rousseauxii, Pterygoplichthys pardalis and Cichla spp.) varied from2.8x10-5 to 1.3x10-4, and the value found for the sum of the sizes of the fish stocks was approximately 600,000 tons. Methodological implications for the context of poor data, catchability studies, evaluation of species conservation status and monitoring of fishing are discussed.
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