Efeito do manejo pesqueiro sobre as assembleias de peixes em lagos situados na ilha da Paciência - Iranduba - Amazonas

Abstract

Fishery co-management in Amazon basin has proved to be a very efficient tool, providing a surprising recovery to the pirarucu stocks and promoting an increase in the population abundance the specie in managed areas. However, little is known about the effects that management can establish on the ichthyofauna. In view this shortcoming, this study proposed to evaluate the implications that the pirarucu management can cause to structure on fish assemblages in floodplain lakes located in the Paciência island, Iranduba citty, Amazonas State. From a bibliographical review as possible to observe that fishery management model based on co-management and its management tools, like as fishing agreements, has presented a positive and promising result to be replicated throughout the Brazilian Amazon. However, the amount of published scientific work that evaluates the efficiency and impacts of this management modality on biota is still limited. A total of 1088 fish were sampling from 64 species before to management and 4039 fish from 93 species after management. The fish were captured using gillnets during the low water period (disconnected lakes) in six lakes (two units representing management category). The composition and structure the fish assemblages presented statistical difference when compared in the time before and after the management. However, when comparing the species composition and the structure on fish assemblages between managed, preserved and commercially used lakes, no difference was found, attesting that the ichthyofauna of these lakes is statistically similar. Finally, the results presented evidence the efficiency of fishing agreement implemented in Paciência island, as a strategy to contribute to the maintenance on the biodiversity in lake system.