军曹鱼(Rachycentron canadum)早期发育阶段的摄食及其影响因子*

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Abstract

The feeding rhythm and intensity of Cobia(Rachycentron canadum) and the influences of food densities, temperatures and salinities on larvae and juvenile were investigated. The results showed that an obvious feeding circulation rhythm of 8 d larvae(fed on rotifers), 23 d juvenile(fed on atemia larvae) and 38 d juvenile(fed on non-living food) were observed. Feeding mainly proceeded in daytime, which accounted to more than 68% of the all-day total feeding intensity, and there was little or no feeding in the darkness of night. The feeding intensity during the period of 6:00-8:00 am and 16:00-18:00 pm was maximum. It seemed that the Cobia feeding rhythm was characterized by twilight feeding. The suitable food densities of 8 d larvae and 23 d juvenile were ranged at 15 ind·mL^-1-20 ind·mL^-1 and 7 ind·mL^-1-12 ind·mL^-1 respectively in the experiments of different food densities. The curves of the effects of temperatures and salinities on the feeding intensity of 18d juvenile cobia were displayed in the parabola type. The suitable temperature and salinity for juvenile were ranged 27℃-31℃ and 28‰-32‰ respectively. The relationship between feeding intensity and food density, temperature and salinity were well described by a binomial equation.

Key words： Cobia(Rachycentron canadum) early developmental stages feeding influencing factors

Received: 25 August 2004

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	CHEN Hao-ru
	SUN Li-hua
	WANG Zhao-ding

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CHEN Hao-ru,SUN Li-hua,WANG Zhao-ding. Cobia(Rachycentron canadum) feeding and its influencing factors at early developmental stages[J]. , 2004, 23(4): 299-304.

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http://journal15.magtechjournal.com/Jwk_stkx/EN/ OR http://journal15.magtechjournal.com/Jwk_stkx/EN/Y2004/V23/I4/299

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