Effects of Sowing Seaweed Gracilaria lichevoides on Growth of Sea Cucumber Apostichopus japonicus in a Seawater Pond
ZHOU Quanli1, QIN Xianming2, REN Lihua1, GUO Zhicheng1, HAN Huizong1, WANG Zhongquan1, XIANG Zhiwei1, LIU Yuanjin1, LIU Yihao1
1. The Key Laboratory of Restoration for Marine Ecology of Shandong Province, Shandong Marine Resource and Environment Research Institute, Yantai 264006, China; 2. Fishery Development Service Center of Rencheng District of Jining City, Jining 272000, China
Abstract：The seaweed function as food for marine organisms and regulate the ecological environment in the multi-trophic level integrated culture system. In order to study the ecological polyculture technology of the sea cucumber Apostichopus japonicus and seaweed Gracilaria lichevoides sown at the bottom of seawater pond, the experiment was design as one stocking density (100.0±23.6) g/m2 for sea cucumber and 4 stocking density (0 g/m2, 100 g/m2, 300 g/m2, and 600 g/m2) for seaweed in pilot test pond (0.1 hm2), respectively. The results showed that the G. lichevoides reduced the temperature and increased the dissolved oxygen (DO) level at the bottom of the seawater pond in the period of high temperature (P<0.05); meanwhile, the harvest quantity and quality of sea cucumber increased with the increase of the stocking density of seaweed. There were significant differences in growth and survival of sea cucumber between control and treatment groups (P<0.05). There was no obvious difference in the growth of seaweed in the treatment group (P>0.05). There was a significant difference between the growthof sea cucumber after survival incontrol group and the treatment group (P<0.05), without significant difference in the treatment groups (P>0.05). The experiments show that the seaweed can decrease the temperature and dissolved oxygen level, increase the survival and growth rate of the sea cucumber at the bottom of the seawater pond, the 300—600 g/m2 stocking density of the seaweed G. lichevoides is the suitable conditions for survival and growth of the sea cucumber.
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2023, Vol. 42 
