Feeding behaviour in some teleosts is triggered by single amino acids primarily through olfaction
Feeding behaviour in some teleosts is triggered by single amino acids primarily through olfaction
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DOI：
10.1111/j.1095.8649.2006.00967.x
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发表时间：
2006-03-01
影响因子：
2
通讯作者：
Hara, TJ
中科院分区：
文献类型：
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作者：
Hara, TJ
本研究在一个流动行为槽中，研究了幼稚虹鱼Oncorhynchus mykis、湖Charr Salvelinus namaycush、湖白鱼Coregonus clupeaformis和金鱼Carassius auratus对食物提取物和选定的氨基酸(10(-6)M)和相关化学物质的行为反应。半胱氨酸是电生理学确定的最有效的嗅觉刺激氨基酸，在所有被研究的物种中，半胱氨酸都能增强运动活动，这是一种最初的唤醒行为，其方式与食物提取物完全相同。随之而来的是不同物种的特定搜索行为模式：1)虹鱼的海底搜索；2)查尔湖的浮出水面和跳跃；3)白鱼对槽窗的探索行为；4)金鱼的啄石行为。嗅觉刺激性中性氨基酸丙氨酸和丝氨酸以及味觉刺激性亚氨基酸脯氨酸在诱导捕食行为方面有不同程度的效果。精氨酸和谷氨酸抑制了虹鲑鱼的运动活动，但触发了其他物种的摄食行为。Agmatine是一种脱羧基精氨酸，可刺激所有受试物种的摄食行为，但虹鲑鱼除外。观察到的行为反应与电生理阈值和特异性非常一致。总而言之，目前的数据表明，在幼稚的鱼类中，单一氨基酸和密切相关的化学物质主要通过嗅觉启动摄食行为，并可互换并辅之以味觉。
The present study investigated behavioural responses of naive rainbow trout Oncorhynchus mykiss, lake charr Salvelinus namaycush, lake whitefish Coregonus clupeaformis and goldfish Carassius auratus to food extracts as well as selected amino acids (at 10(-6) M) and related chemicals in a flow-through behaviour trough. Cysteine, the most potent olfactory stimulating amino acid determined electrophysiologically, enhanced locomotor activity, an initial arousal behaviour, in all species examined, in exactly the same fashion as did food extracts. The increased locomotor activity was followed by distinct species-specific search behavioural patterns: 1) bottom searching in rainbow trout; 2) surfacing and jumping in lake charr; 3) exploratory behaviour against the trough window in lake whitefish; 4) gravel pecking in goldfish. Olfactory-stimulating neutral amino acids alanine and serine and gustatory-stimulating imino acid proline were effective, to varying degrees, in eliciting feeding behaviour. Arginine and glutamate suppressed the locomotor activity in rainbow trout, but triggered feeding behaviour in the other species. Agmatine, a decarboxylated arginine, stimulated feeding behaviour in all species tested, except rainbow trout. The observed behavioural responses were in close accordance with the electrophysiological threshold and specificity. Together, the present data demonstrate that single amino acids and closely related chemicals initiate feeding behaviour primarily by olfaction, and interchangeably and complemented by gustation, in naive fishes.