Back-calculation methods were applied to length/age data and the parameters of von Bertalanffy's growth model were fitted based on average length per ring.
Fish with no more than eight rings and six years of age were found, the two first rings after the core being formed during the first year. Marginal increment and edge type percentage methods were used for validation, resulting in one ring per year, formed during summer-autumn. Readings of sliced and burned otoliths were conducted on 686 individuals (397 females, 129 males and 160 young - sex not identified), identifying opaque and translucent zones. A total of 3,651 specimens obtained from surveys and sampling landings using trawlers and long-lines in the South-Southeast Region (21ºS to 34ºS) between 19 were analyzed. This is the first detailed study on the age and growth of the Argentine hake Merluccius hubbsi in Brazilian waters.
0 kommentar(er)
