Temporal variation of commercial catches of torroto grunt, Genyatremus luteus in fishing pole of brazilian north coast - Peninsula of Ajuruteua- Bragança - PA

Abstract

Brazilian Northern coast includes the states of Amapá, Pará and Maranhão, characterized by high fishing productivity. Among of captured resources is Genyatremus luteus (torroto grunt). This study aims to analyze the seasonal variation of the fishing and how the behavior of the precipitation can influence the production in the Northern coast of Brazil. Data were collected during April 2008 to March 2011 by fishing vessel and in eleven ports of Bragança fishing land. Data of landings were obtained by census method and seasonal period data were given up by the National Institute of Meteorology (INMET). Values of abundance were designed by capture for unit of effort (CPUE). Data analysis was done using softwares STASOFT® 10.0 and Microsoft EXCEL 2010. A total of 3,291 fishing landings were registered, accomplished by 305 vessels, producing a total of 323 t of torroto grunt. The largest production average occurred in dry-rainy transition period (TSC) (F = 14.5; p<0.01). CPUE by vessel type and seasonal period obtained larger significance in small load vessels (BPP) in TSC period (F = 4.0; p<0.01). The categories of fishing gear with higher average production were mobile gillnets (F = 60.7; p<0.01). The seasonal variation has great influence on the productivity of the studied species.