日本鳗鲡仔鱼的开口饵料和行为特征

在连续多年日本鳗鲡人工繁殖实验的基础上,研究了不同饵料对日本鳗鲡仔鱼存活率的影响,并记录了仔鱼的运动特征和摄食行为。结果显示,与对照组(不投饵)相比,投喂以鲨鱼卵、磷虾提取液为基础的饵料和以鲨鱼卵、海蜇匀浆液为基础的饵料以及微绿球藻液均提高了日本鳗鲡仔鱼的存活率,仔鱼发育至柳叶鳗前期阶段;而投喂以鲨鱼卵、卤虫匀浆液为基础的饵料和以卤虫匀浆液、磷虾提取液为基础的饵料,以及轮虫、海带+龙须菜匀浆液或海蜇以及发酵鲨鱼肉,均降低日本鳗鲡仔鱼的存活率。实验同时还研究了日本鳗鲡仔鱼的主动摄食行为,摄食时仔鱼先用吻端反复多次触碰食物,然后张开下颌咬食,证实了日本鳗鲡早期仔鱼的摄食方式是触碰后咬食。

Effects of different initial diets on the survival and behavior characteristics of the larvae of Japanese eel (Anguilla japonica)

Based on the continuous research on artificial propagation of Japanese eel Anguilla japonica, the effects of different initial diets on the survival of eel larvae were investigated, and the motion characteristics and feeding behavior of larvae were observed and recorded. The results showed that the shark eggs, krill extract-based diet and shark eggs, jellyfish-based diet and exclusively microalgae had positive effects on larval survival; However, the shark eggs, artemia-based diet and artemia, krill extract-based diet, rotifers and kelp, seaweed homogenate, jellyfish and fermented shark flesh reduced larval survival. The larvae touched the diets repetitiously, and then opened the lower jaw widely and bit, which confirmed that the way for eel larvae to ingest diets was biting after touching.