Open AccessAge and growth of larval Sardinella aurita (Pisces: Clupeidae) from northeastern Venezuela, determined by otolith microstructure analysis
Author(s) -
TC Ramírez-M,
BJ Marín-E
Publication year - 2006
Publication title -
ciencias marinas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.215
H-Index - 29
eISSN - 2395-9053
pISSN - 0185-3880
DOI - 10.7773/cm.v32i3.1123
Subject(s) - sardinella , sagitta , otolith , bay , ichthyoplankton , clupeidae , larva , biology , zoology , fishery , growth rate , fish <actinopterygii> , ecology , oceanography , geology , mathematics , sardine , geometry
Age and growth of Sardinella aurita larvae were analyzed based on daily growth increments in sagitta otoliths. Larvae were obtained from ichthyoplankton samples collected from the outer shelf off Margarita Island and from Mochima Bay (northeastern Venezuela), between March 1999 and January 2001. Total length, standard length (SL) and height of larvae were measured and the otoliths were examined under a light microscope. Larval size ranged from 1.35 to 15.90 mm SL, the Margarita Island larvae being signicantly larger than those from Mochima (t = 18.69; P 0.05) between them. The mean backcalculated growth rate was 0.99 mm day–1 and it was not significantly different from the mean growth rate obtained from fitted length-age data (F = 3.32, P > 0.05). Morphological changes in otoliths were evident from the mean daily increment widths, with wider increments in larval otoliths from Margarita Island (H = 42.54, P < 0.001).