The daily food intake of 0-group plaice (Pleuronectes platessa L.) under natural conditions: changes with size and season
The daily food intake of 0-group plaice (Pleuronectes platessa L.) under natural conditions: changes with size and season
复制标题
自然条件下0组鲽鱼(Pleuronectesplatessa L.)每日摄食量随体型和季节的变化
DOI：
10.1093/icesjms/41.2.181
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发表时间：
1984
影响因子：
3.3
通讯作者：
S. Lockwood
中科院分区：
文献类型：
--
作者：
S. Lockwood
对1969年7月和9月至10月在约克郡Filey湾收集的0组鲽样本进行了分析，以5毫米长度的组为单位估计其每日食物摄入量。在7月份，每日食物摄入量与体重之间存在线性关系，相当于在18毫米至49毫米的尺寸范围内每天体重的10%。秋季测鱼体长为40 ~ 80 mm时，日相对摄食量降至体重的1.5%，但不能确定日摄食量与体重之间是否呈线性关系。0组鲽鱼的饮食变化与鱼的大小有关。由此可见，改变食性可以使捕食者的最佳体型保持在体重的0.5% ~ 10%之间。这种饮食的变化使每天所需的猎物生物数量保持在最低限度，并且由于平均体型增加而相对摄食率下降，这解释了为什么种群中较大的鱼类比小鱼更有可能空腹。变质的鲽鱼幼虫停止进食超过24至36小时。这可能是由于较少的攻击，或较少成功的攻击，导致改变眼口结构。
Samples of 0-group plaice collected in Filey Bay, Yorkshire, during July and September-October 1969 were analysed to estimate their daily food intake by 5 mm length groups. In July there was a linear relationship between daily food intake and body weight, equivalent to 10 % whole body weight per day over the size range 18 mm to 49 mm. In the autumn when the fish examined were 40 mm to 80 mm, the relative food intake fell to 1·5 % body weight per day, but it is not certain that the relation between daily food intake and body weight was linear.The change in diet of 0-group plaice is described in relation to the size of the fish. It is concluded that diet changes to maintain an optimal prey size between 0·5 % and 10 % of the predators' weight. This change in diet keeps to a minimum the number of prey organisms required each day and, due to the falling relative feeding rate with increase in mean size, explains why larger fish in the population are more likely to have empty stomachs than small fish.Metamorphosing plaice larvae are shown to cease feeding for more than 24 to 36 hours. This may be due either to fewer attacks, or fewer successful attacks resulting from a changing eye–mouth configuration.