A survey of some biological aspects of cobia (Rachycentron canadum)
2006
Daquqi, Behnam | Darvishi, Mohammad | Behzadi, Siyamak | Safa`ie, Mohsen | Forughi Fard, Hojat Ol-Lah | Kamali, E`isa
Biology aspects of cobia (Rachycentron canadum) were investigated from October 2005 to December 2006 in Northern waters of Persian Gulf (Hormozgan province).The reproduction cycle, sexual maturity, sex ratio, Fecundity, Lm50, feeding, length frequency, growth parameters and mortality of cobia were studied from total of 509 specimens ranged from 19 to 159 fork length. Gonadosomatic index peaked during spring and summer with main peak in June. Spontaneous spawning occurs around the year with peak in June. The overall female to male ratio was significantly 1 : 1.49 (P0.05). Batch fecundity were estimated 1684954±118990 in 15 females. Relationship between total length and fecundity were calculated F, Ǿand t0 were calculated by von bertalanfy growth equation : 0.11 ( ), 168.65 cm, 3.49 and -0.97 respectively. The instaneous rate of total mortality (z), natural mortality (M) and fishing mortality estimated by catch curve analysis were 0.30, 0.25, 0.14 ( ). Exploitation rate and Tmax were 0.36 and 28 year respectively.
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