Life history traits and population structure of Citharichthys spilopterus (Paralichthyidae): accompanying fauna species in Southern Brazil
DOI:
https://doi.org/10.56926/repia.v3i1.55Keywords:
demersal fish, fishing impact, trawlAbstract
The study aimed to describe life history traits, such as population structure, age, growth, mortality and reproductive biology of the sole Citharichthys spilopterus, in a subtropical estuary in southern Brazil. 275 specimens were captured, obtaining data on total weight, total length, tissue samples and gonad weight. The results showed five stages of gonadal development and split spawning, with reproductive peaks in October and March. The length at first maturation was 10.1 cm for females and 8.0 cm for males, with positive allometric growth. The theoretical maximum length was 17.9 and 15.5 cm, growth coefficient of 0.43 and 0.68 year-1 and longevity of 5.9 and 4.4 years, for females and males respectively. Adult individuals predominated in all collection months, except in May. Total mortality was 1.35 and 2.39 year-1, natural mortality was 1.07 and 1.5 year-1 and fishing mortality was 0.28 and 0.89 year-1, for females and males respectively. The exploitation rate obtained was 0.21 and 0.37year-1, for females and males respectively, allowing us to infer that the species is in an adequate exploitation situation in relation to the stock.
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