[Objective] The paper was to study the effects of laminarin on growth performance and immunity of pearl gentian groupers. [Method] Four separate30 m2 concrete pools were used as a closed circulating water aquaculture system for the experiment. Simultaneously,approximately 1 800 groupers were placed in each of the two pools for treatment or control. The initial weight of the individual fish was( 275. 55 ± 29. 79) g. They were fed with either a control diet or one containing 0. 6% laminarin in the pools for 66 d. [Result]At the end of the feeding trial,the weight gain of the groupers in treatment group was increased by 29. 03%( P 0. 05). For each kilogram weight gain of an individual fish,the cost of the treatment diet was 1. 96 yuan less than that of control diet,i. e.,a reduction of 12. 54%. On the other hand,the activities of alkaline phosphatase( AKP),lysozyme( LZM) and total superoxide dismutase( T-SOD) of the groupers in treatment group were significantly higher than those in control group( P < 0. 05). [Conclusion] Addition of 0. 6% laminarin in the regular feed would improve the growth performance and immunity of pearl gentian groupers in aquaculture.
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