Document Type : Original Manuscript
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Abstract
Some biological characteristics and population dynamic of Platycephalus indicus were studied during one year from May 2011 to March 2012 in the coastal waters of Bandar Abbas. A total of 1106 samples were collected. Also, each month 35 fish was choosen and transferred to the laboratory for evaluation of spawning season.The ages of 279 specimens were determined by sectioned otoliths. The ages of the females were estimated to be between 1 to more than 7,while the ages of the males were from 1 to more than 4.The relationship between weight and length (Total length) can be expressed as W=0/004L3/16 35 for male and W = 0/0042L3/1293 for female.This equation hndicates that keeled mullet has isometric growth. The values for natural mortality (M) resultant coefficient were M = 0.886 year-1 for females and 0.736 year-1 for males, and the estimated Z values were 1.43 year-1 for females and 1.62 year-1 for males. The mean value of the gonadosomatic index (GSI) for males and females was 0.82 ± 0.25 and 2.477 ± 0.59 respectively in each year. The mean values of the hepatosomatic index (HIS) were 0.89 ± 0.20 for males and 1.28 ± 0.16 for females. The highest HSI values for this location were observed in January, and the lowest were in April.
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