A study on the some specials of biological javelin grunter (Pomadasys Kaakan), tigertooth croaker (Otolithes ruber) and spotted croaker (Protonibea diacanthus) in Hormozgan waters
2004
Kamali, Easa | Valinasab, Tooraj | Dehghani, Reza | Behzadi, Syamak
Aspects of the biological features such as age and growth , the reproductive cycle , food and feeding of the tigertooth croaker (Otolithes ruber) and the Javelin grunter (Pomadasys kaakan) were studied from a total of 540 specimens of tigertooth croaker and 477 Javelin grunter collected in Hormuzgan waters between September 1381 and desember 1382 . Fishes aged using sections of their otoliths . The equation of growth for tigertooth croaker and Javelin grunter obtained Lt = 72(1-e -0/151(t+1/369) ) and Lt = 69(1-e -0/162(t+1/169) ) respectively. Weight-length relationships for tigertooth croaker and Javelin grunter were W = 0/0064L 3/1268 and W =0/0293L 2/7957 respectively. Maximum length-growth rate for tigertooth croaker and Javelin grunter were in 3 and 2 years old and their mortality rates were estimated 0/4606 and 0/3216 respectively. Lm50 and Tm50 for tigertooth croaker and Javelin grunter were 33/7cm, 2/75 years and 44cm , 5/1 years respectively. Sex ratio(femail : male) for tigertooth croaker and Javelin grunter were 1/76:1 and 1/065:1 respectively. maximum absolute and relative fecundity for tigertooth croaker and Javelin grunter were 1128401 , 1761092 and 943/7 , 2229/46 respectively. Diameter of ovol for tigertooth croaker and Javelin grunter were 350 and 445 micron respectively. Spawning seasons both tigertooth croaker and Javelin grunter obtained between May and June . Main food for tigertooth croaker were fish and shrimp and for Javelin grunter was crustacian specially crab.
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