A LPUE (LANDING PER UNIT EFFORT) ANALYSIS OF THE TRAWL FISHERY FOR THE COASTAL SHRIMPS Artemesia longinaris AND Pleoticus muelleri OFF SOUTHERN BRAZIL

Abstract

A B S T R A C TThe Argentine stiletto shrimp (Artemesia longinaris) and the Argentine red shrimp (Pleoticus muelleri) currently sustain an important fishery in terms of tonnage and revenues in southern Brazil. This study analyzed the factors affecting the abundance of both species through the application of Generalized Linear Models to landing-per-unit-of-effort (LPUE) data of the trawl fleet operating on the main fishing grounds between 1998 and 2005. The main patterns of LPUE variability of both species were attributed do the effect of seasons and annual cycles. Larger yields were obtained in the southern shallow areas of Rio Grande do Sul State. No tendency either to an increase or a decline in stock abundance was observed, but the effort in one year was affected by the success of the captures of the previous year. In the last two years analyzed the abundance and the total captures declined. R E S U M OO camarão-barba-ruça (Artemesia longinaris) e o camarão-santana (Pleoticus muelleri) são espécies que sustentam uma pescaria responsável por elevadas capturas das frotas de camaroeiros no sul do Brasil. Este trabalho teve como objetivo analisar a variabilidade da abundância das duas espécies à variação dos dados de DPUEs da frota de arrasteiros em operação entre 1998 e 2005, por meio do ajuste de Modelos Lineares Generalizados (MLG). As principais variações de abundância das duas espécies estão relacionadas aos ciclos anuais e a temporada de pesca. As áreas rasas ao sul do Rio Grande do Sul proporcionaram maiores rendimentos. Não foram observadas tendências de aumento ou declínio na abundância do estoque, mas o esforço de um determinado ano é condicionado pelo sucesso das capturas do ano anterior. Nos dois últimos anos analisados a abundância e as capturas totais foram reduzidas.

Fishing ground and tuna productivity by tuna longline based on Benoa Bay, Bali, Indonesia

“…CPUE represents the total value of the catch divided by the amount of effort made, while the LPUE calculates the catch that is actually captured and sold at the port by reporting. According to Metri and Perez (2014), it is stated that bycatches are usually disposed of on the ship so that the calculation of the main catches is more effective, if the bycatch is relatively stable then LPUE can provide better CPUE thinking. Landing catches can usually describe the number of specimens or the weight of the catch, and "unit effort" is represented by the value of the length of a fishing unit using its fishing gear (for example: the number of ships when soaking time per unit time).…”