Age and growth of Boops boops (Linnaeus, 1758) in Izmir Bay, Aegean Sea, Turkey


KARA A. , BAYHAN B.

JOURNAL OF APPLIED ICHTHYOLOGY, cilt.31, ss.620-626, 2015 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 31 Konu: 4
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1111/jai.12680
  • Dergi Adı: JOURNAL OF APPLIED ICHTHYOLOGY
  • Sayfa Sayıları: ss.620-626

Özet

The present study was conducted to determine the age relationships in lengths and weights of Boops boops (Linneaus, 1756) in Izmir Bay, central Aegean Sea. A total of 932 specimens (503 females and 429 males) were caught by gillnet, trammel net and a combination thereof on a monthly sampling basis from November 2008 through October 2009. Total length and weight of sampled fish ranged from 11.3 to 27.9cm and from 12.2 to 261.7g, with a mean of 19.6cm and 82.7g, respectively. Length-weight relationships for all individuals were described by the parameters a=0.0050, b=3.237 and r(2)=0.956. The von Bertalanffy growth curve fitted to the lengths-at-age provided parameters of L=29.87cm k=0.243 and t(o)=-0.98 for males and L=30.79cm, k=0.239 and t(o)=-0.90 for females. Based on otolith readings, age determinations varied from 1 to 5years. Maximum age was 5years in age group 2, with 29.84 and 37.97% for males and females, respectively. The overall 1:1.17 sex ratio of males to females was significantly biased toward females (P<0.05). There was no statistical difference in the mean condition factor (P>0.05), with a value of 1.028 for the entire population. The growth performance index (phi(')) was 2.33 and 2.36 for males and females, respectively. Results were similar to other geographical areas, which suggests that a common fisheries management might be possible.