"Aspectos biológicos e dinâmica das capturas do tubarão-azul (Prionace glauca) realizadas pela frota espinheleira de Itajaí - SC, Brasil / Biological aspects and dynamics of the captures of the blue shark (Prionace glauca) accomplished by the longline fleet from the Itajaí - SC, Brazil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

This study analyzed data from the capture of blue shark (Prionace glauca) by the longline fleet based in Itajaí, State of Santa Catarina, Brazil, operating in south and southeast regions and in international neighboring waters from 1996 to 2002. The data were collected in the form of logbooks, landing sheets and through research cruises personally conducted aboard the commercial fleet. Based on the biological information gathered from the cruises, equations were calculated in order to convert the data of carcass weight captured and listed in the landing sheets for total length and total weight. After data conversion, length frequency for each month and the analysis of accumulated capture was rebuilt. With the data from logbooks, CPUE/1000 hooks were analyzed in terms of kg and the number of individuals plotting of results. Statistical modeling was then developed with the use of GLM to assess the effect of time and space variables in CPUE’s. At the time of fishery recruitment between May and November, the following were observed: (i) the expansion of the mating area to 34º S (ii) time variables influenced more the CPUE’s than the space variables (iii) a positive correlation of the latitude with the CPUE’s and a negative correlation for longitude and (iv) the need for conservation of this important group of predators.

ASSUNTO(S)

glm rionace glauca glm longline prionace glauca conservation conservação espinhel fishery recruitment recrutamento por pesca

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