摘要
研究体重为(9.20±1.50)g的三疣梭子蟹在分别投喂饵料鱼和兰蛤及有无沙底质条件下的昼夜摄食节律、摄食率和昼夜摄食量的差异。结果表明:投喂兰蛤组的三疣梭子蟹摄食高峰在20:00左右,投喂饵料鱼组三疣梭子蟹的摄食高峰在02:00左右;沙底质条件下三疣梭子蟹的夜晚摄食量占全天摄食量的94.34%,而无底质组为75%,表明在潜底环境条件下三疣梭子蟹具有更明显的昼夜摄食节律;投喂兰蛤组三疣梭子蟹黑夜摄食量比值显著高于白天,分别为75%和25%,而投喂鱼组黑夜摄食量比值仅略高于白天,分别为59.21%和40.79%。此外,投喂鱼组白昼摄食率可达80%,显著高于投喂兰蛤组的10%,表明投喂鱼饵料有利于三疣梭子蟹的白昼进食。根据昼夜摄食量对比分析,建议采用白昼投喂占总投喂量20%～30%的鱼肉以降低蜕皮残食,夜晚投喂70%～80%的兰蛤的投喂策略促其生长,并减少梭子蟹的残食。
The parameters of circadian feeding rhythm, feeding rate and food consumption in day and night of juvenile Portunus trituberculatus （Miers）were investigated under different feedstuff and sediments conditions. There was a pronounced feeding peak occurred at about 20：00 when feeding with clam, and at 02..00 when feeding with goby. An obvious diurnal feeding rhythms were observed when the crab maintained in sand sediments. The percentage of food consumption at night was 94.34% when the crab maintained with sand sediments, but 75% without sand. The food consumption in night was much more than that in daylight when feeding with clam, and it was not obvious when feeding with goby. An 80 percent of crabs was observed feeding in daylight in group of feeding with goby contrast to only 10% in group of clam, which indicated that the crab made more demands of food when feeding with goby in daylight. A feeding strategies of 20%-30% of day diet with goby in daylight and 70% - 80% clam in night may meet the diet need of the Portunus trituberculatus and weaken the risk of cannibalism to the crab.
出处
《海洋湖沼通报》
CSCD
北大核心
2009年第2期42-48,共7页
Transactions of Oceanology and Limnology
基金
国家"十一五"科技支撑计划项目课题(2006BAD09A01)资助
关键词
三疣梭子蟹
摄食节率
饵料
底质
摄食量比值
Portunus trituberculatus
feeding rhythm
feedstuff
sediments
food consumption
