The influence of population structure and reproductive aspects of the genus Stellifer (Oken, 1817) on the abundance of species on the southern Brazilian coast

Brazilian Journal of Biology

Jl. Rodrigues-filho²  Jr. Verani²  Ac. Peret²  Lm. Sabinson²  Jo. Branco¹ 

[1] ,Universidade Federal de São Carlos Departamento de Hidrobiologia São Carlos SP ,Brazil

关键词: fish reproduction;    gonadosomatic index;    reproductive activity index;    population dynamics;    bycatch;    species coexist;    reprodução de peixes;    índice gonadossomático;    índice de atividade reprodutiva;    dinâmica de populações;    fauna acompanhante;    coexistência de espécies;   

DOI  :  10.1590/S1519-69842011000500019

来源: SciELO

【 摘 要 】

The differences between abundance and the relationship with aspects of population and reproductive Stellifer rastrifer, Stellifer stellifer and Stellifer brasiliensis were analysed. Data were collected monthly trawl directed for capture of seabob shrimp in Armação do Itapocoroy, an important fishing area on the southern Brazilian coast. The chi-square test showed that the population of S. rastrifer presented values of capture significantly higher than others in all evaluated periods. The frequency distribution of total length curves combined with records of the size at first maturity (L50) showed that S. rastrifer is a species with a majority of the adults effectively participating in the reproductive period. The frequency of occurrence of individuals in reproduction monthly examined together with changes in the gonadosomatic index (GSI) and the reproductive activity index indicated that spring was the main breeding season for the three species. However, it was observed that the reproductive period of S. rastrifer was more pronounced and more extensive than that of its congeners, apparently providing it with ecological advantages and enabling a more effective population balance given the pressure exerted by fishing in the study area.

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