Estrutura populacional da raia viola de focinho curto, Zapteryx brevirostris, em um ambiente de ressurgência costeira

Abstract

The Lesser guitarfish, Zapteryx brevirostris (Müller & Henle, 1841), is considered a vulnerable species. This is due to its low fecundity and because this species is commonly captured as fisheries by-catch. This study compiled a data collection of three years (1985-1988) and described aspects of length, sex ratio, seasonality and bathymetry (30, 45 and 60 m) of a population of Z. brevirostris. 211 specimens were studied, where the population of Z. brevirostris is distributed in practically all classes total length of 30 to 45 m. There is no sexual segregation these depths. None of the specimens were found at 60 m. This work is the first to explore aspects of the seasonal distribution of the species at depths.