不同浓度小球藻与养殖模式对橄榄蛏蚌生长的影响

Influence of Different Chlorella spp.Concentrations and Culture Patterns on Growth of Solenaia oleivora,

在水温为31.3~33.0℃的室内条件下,对体质量2.22~4.09 g的橄榄蛏蚌(Solenaia oleivora)投喂小球藻(Chlorella.spp),浓度设置为1.0×10^(6)、1.0×10^(5)、0.5×10^(5)、1.0×10^(4)和1.0×10^(3) cells/L,研究不同浓度小球藻对橄榄蛏蚌生长的影响;另设置无土、浅土池塘(5 cm厚)散养与网箱吊养模式,投喂小球藻密度为1.0×10^(4) cells/L,研究不同培育模式对橄榄蛏蚌生长的影响。30 d后测定不同浓度小球藻与不同养殖条件对橄榄蛏蚌生长率的影响。结果表明,在不同小球藻浓度间,橄榄蛏蚌含水量有一定差异;在小球藻浓度为1.0×10^(4) cells/L时橄榄蛏蚌体长与体质量增长率最高,在小球藻浓度为1.0×10^(3) cells/L时橄榄蛏蚌体长与体质量增长率最低。方差分析结果表明,不同小球藻浓度间橄榄蛏蚌肥满度无显著影响(F=0.817,P=0.543,P>0.05),含水量差异显著(F=6.627,P=0.009,P<0.05);3种养殖模式中,浅土模式更有利于橄榄蛏蚌生长,在该模式下与在自然环境中橄榄蛏蚌的栖息生境、摄食习性相似,能充分利用养殖水体底层的营养物质。

Solenaia oleivora with body weight of 2.22-4.09 g were raised in a 100 L round plastic bucket containing 40 L tap water at a density of 8-10 individuals per bucket and fed Chlorella spp.at various concentrations of 1.0×10^(6),1.0×10^(5),0.5×10^(5),1.0×10^(4) and 1.0×10^(3) cells/L at water temperature of 31.3-33.0℃to investigate the effect of green alga concentration on growth of S.oleivora.In addition,S.oleivora with the same size were reared in a soil-free pond,approximately 5 cm thick soil shallow pond and net cages for 30 days to evaluate the effects of culture patterns on the growth of S.oleivora.The results showed that there was significant difference in moisture content in S.oleivora among algae concentration groups.The maximal specific growth rate in body length and weight gain rate were observed in S.oleivora at concentration of 1.0×10^(4) cells/L and the minimal specific growth rate in body length and weight gain rate were found in S.oleivora at concentration of 1.0×10^(3) cells/L.Variance correlation analysis(ANOVA)revealed that there was significant difference among five algae in water content(F=6.627,P=0.009,P<0.05),but not for fatness(F=0.817,P=0.543,P>0.05).Among three culture patters we concluded that shallow soil pattern was involved in the similarity of habitat settings and feeding habits to make full use of relevant nutrients at bottom layers of culture patterns,shallow soil pattern was more favorable for the growth of S.oleivora.