Age, growth, and reproductive biology of Atlantic bonito (Sarda sarda Bloch, 1793)from the Turkish coasts of the Black Sea and the Sea of Marmara


KAHRAMAN A. E. , GÖKTÜRK D. , YILDIZ T., UZER U.

TURKISH JOURNAL OF ZOOLOGY, vol.38, no.38, pp.1-8, 2014 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 38 Issue: 38
  • Publication Date: 2014
  • Title of Journal : TURKISH JOURNAL OF ZOOLOGY
  • Page Numbers: pp.1-8

Abstract

This study aims to investigate some biological characteristics of Atlantic bonito, Sarda sarda Bloch, 1793, from the Turkish
coasts of the Black Sea and the Sea of Marmara. A total of 212 S. sarda (100 females, 89 males, and 23 undetermined) were sampled
monthly between May 2011 and September 2012. The sex ratio (>/+) was 0.89; females prevailed but not statistically significantly so.
Fork lengths of all sampled individuals ranged from 17.7 to 63.0 cm. The length–weight relationship for all individuals was calculated
as W = 0.01 L3.085. The ages of the fish ranged from 0+ to 2+. Growth parameters calculated according to the von Bertalanffy growth
equation were L∞ = 69.565 cm, k = 0.439, t0 = –1.327 for females; L∞ = 74.603 cm, k = 0.364, t0 = –1.518 for males; and L∞ = 67.883
cm, k = 0.463, t0 = –1.220 for both sexes. One hundred ovaries were obtained from the females, and these ovaries were histologically
examined to determine the reproductive conditions and developmental stages of oocytes. The gonadosomatic index values calculated
for females indicated that spawning generally occurred between May and August. The most intensive spawning period was observed in
June and July. The length at first maturity was estimated to be 42.5 cm for females and 36.8 cm for males.