摘要
将3种不同规格的三疣梭子蟹[平均体质量分别为(101.26±5.36)g、(62.37±4.10)g和(24.37±2.10)g]各10只饲养于2.6m×1.8m×1m的室内水泥池单元格内,水深40cm,重复3组。每日17:00投喂鲜活的带鱼块,通过摄像机观察不同规格三疣梭子蟹的竞食行为,每组重复3次。结果表明:(1)不同规格三疣梭子蟹发现、抱持食物所需的时间相近,无显著差异(P>0.05);(2)个体间竞食激烈,(101.26±5.36)g组蟹抢食的比率最高,抢夺(62.37±4.10)g组或(24.37±2.10)g组蟹所持有的食物;(101.26±5.36)g组蟹抢食的次数显著多于(62.37±4.10)g组或(24.37±2.10)g组蟹的抢食次数(P<0.05),(24.37±2.10)g组蟹抢食的次数最少;(24.37±2.10)g组蟹被(101.26±5.36)g、(62.37±4.10)g、(24.37±2.10)g组蟹抢食的次数及总次数最高,显著多于(101.26±5.36)g组蟹(P<0.05),(62.37±4.10)g组蟹次之,(101.26±5.36)g组蟹最少,后两组蟹无显著差异(P>0.05),表现出明显的"大欺小"现象;(3)(101.26±5.36)g组蟹的食物占有率(45%)显著高于(24.37±2.10)g组蟹(近20%)(P<0.05),而(62.37±4.10)g组蟹占有的食物数量介于(101.26±5.36)g组和(24.37±2.10)g组之间,(101.26±5.36)g组蟹啃食完食物所用的时间仅约为(24.37±2.10)g组蟹的1/5倍。
A total of 30 swimming crab Portunus trituberculatus with three different sizes [average body weight of （101.26±5.36） g （LC）, （62.37±4. 10） g （MC） and （24. 37±2. 10） g （SC）] were raised in the same indoor tanks of each 2.6 m×1.8 m×1 m with water depth of 40 cm with triplication. After crabs were fed fresh ribbon fish at 17：00 daily, camera was used to record their eating and competing behavior for food with triplication. The results showed that swimming crab with different body weight had similar foraging time for food （P〉0.05）. Intraspecific competition for food among swimming crab individuals was highly fierce and the behaviors were approximately divided into five stages： meet stage, demonstration stage, snatch stage, pugilism stage, and withdraw stage. The proportion and frequency of competition for food exhibited that the larger-sizes individuals had a stronger competition desire and were inclined to com- pete for food with smaller individuals. As for the proportion of being deprived of food and the ultimate oc- cupancy of food, smaller-size individuals had relatively poorer capability of invasion and protection for food.
出处
《水产科学》
CAS
CSCD
北大核心
2017年第6期741-746,共6页
Fisheries Science
基金
浙江省科技厅院所专项(2016F50042,2015F10001,2015F30003)
浙江海洋大学博士启动基金资助项目(22135010815)
舟山市科技计划项目(2017C43032)
舟山市普陀区科技计划项目(2015YN209)
关键词
三疣梭子蟹
规格
竞争
食物
Portunus tritubercatus
size
competition
food
