金钱鱼幼鱼低温耐受能力和饵料营养需求的研究

在海水鱼苗培育过程中,温度耐受能力和饵料营养需求是主要考虑的因素。采用人工降温胁迫法,探讨金钱鱼幼鱼对低温胁迫的耐受性。结果表明,金钱鱼幼鱼的低温半致死温度(LT50)为12.2℃,低温致死温度为11.0℃。此外,还开展了金钱鱼幼鱼营养需求的研究,结果显示植物蛋白人工饲料组的生长显著快于动物蛋白人工饲料组,表明金钱鱼对饲料的动物蛋白需求低,这一养殖新对象符合低碳经济的养殖潮流,结果有助于指导金钱鱼人工养殖过程中对水温及饵料营养等因子进行有效管理。

Studies on low temperature resistance and nutritional needs of Scatophagus argus juveniles

In the process of cultivating marine fish,temperature tolerance and nutritional requirement are the main factors for consideration.In the current study,we performed the experiment of low temperature resistance in Scatophagus argus juveniles and proved that LT50 is about 12.2 ℃ and the lethal low temperature is 11.0 ℃ for this species.In addition,experiments about nutritional needs of Scatophagus argus juveniles were also carried out in this study.Through feeding Scatophagus argus juveniles with three different kinds of feed,the results showed that the group fed with plant protein grew significantly faster than the other two groups fed with animal protein(P<0.01).We also observed that Scatophagus argus preferred the synthetic feed made from plant protein.It proved that Scatophagus argus required less animal protein compared with other economic fishes,which suits the aquacultural trend of low carbon economy.Our studies can benefit the regulation and controlling of water temperature and nutritional requirement in the mariculture of Scatophagus argus.