Stock identification of tainha (Mugil liza) by analyzing stable carbon and oxygen isotopes in otoliths

Issue:

Author(s): 
Valéria M. Lemos, Cassiano Monteiro-Neto, Henrique Cabral, and João P. Vieira
Cover date: 
2017
PDF: 
doi: 
10.7755/FB.115.2.7
Pages: 
201-205
Abstract: 

We investigated the use of δ13C and δ18O stable isotopes in otoliths of juvenile tainha (Mugil liza) as indicators of the stock structure of this species of mullet in the southern Atlantic Ocean. Our analysis identified 2 different spawning stocks along the Brazilian coast: the southern stock, from São Paulo (25°S) to Chui (33°S), with distinct seawater temperature requirements for spawning (18–21°C), and the northern stock, from Rio de Janeiro (23°S) to the north (up to 19°S), spawning in seawater temperatures of 21–24°C. These results will contribute to the development of appropriate stock management measures.