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首页> 外文期刊>Journal of Fish Biology >Prey size selection and cannibalistic behaviour of juvenile barramundi Lates calcarifer
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Prey size selection and cannibalistic behaviour of juvenile barramundi Lates calcarifer

机译：幼年尖吻鲈的食肉动物的大小选择和食人行为

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摘要

This study assessed the cannibalistic behaviour of juvenile barramundi Lates calcarifer and examined the relationship between prey size selection and energy gain of cannibals. Prey handling time and capture success by cannibals were used to estimate the ratio of energy gain to energy cost in prey selection. Cannibals selected smaller prey despite its capability of ingesting larger prey individuals. In behavioural analysis, prey handling time significantly increased with prey size, but it was not significantly affected by cannibal size. Conversely, capture success significantly decreased with the increase of both prey and cannibal sizes. The profitability indices showed that the smaller prey provides the most energy return for cannibals of all size classes. These results indicate that L. calcarifer cannibals select smaller prey for more profitable return. The behavioural analysis, however, indicates that L. calcarifer cannibals attack prey of all size at a similar rate but ingest smaller prey more often, suggesting that prey size selection is passively orientated rather than at the predator's choice. The increase of prey escape ability and morphological constraint contribute to the reduction of intracohort cannibalism as fish grow larger. This study contributes to the understanding of intracohort cannibalism and development of strategies to reduce fish cannibalistic mortalities.
机译：这项研究评估了幼年尖吻鲈食肉动物的食人行为，并研究了食肉的大小选择与食人的能量获取之间的关系。食饵处理时间和食人族的捕获成功被用来估计猎物选择中能量获取与能量成本的比率。食人族选择了较小的猎物，尽管它可以吞食较大的猎物。在行为分析中，猎物的处理时间随着猎物大小的增加而显着增加，但食人动物的大小却没有明显影响。相反，捕食成功率随猎物和食人族的增加而显着下降。获利能力指数表明，较小的猎物为各种规模的食人族提供最大的能量回报。这些结果表明，L。calcarifer食人族选择较小的猎物以获得更高的利润。然而，行为分析表明，食肉L. calcarifer食人族以相似的速度攻击所有大小的猎物，但更频繁地摄入较小的猎物，这表明猎物大小的选择是被动的，而不是掠食者的选择。随着鱼的长大，猎物逃逸能力的增强和形态学上的限制有助于减少同类人的同类相食。这项研究有助于了解队列内的同类相食行为，并开发出减少鱼类同类相食死亡率的策略。

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