The responses of hatchery‐reared Atlantic salmon, Salmo salar L., parr to pelletted and wild prey
The responses of hatchery‐reared Atlantic salmon, Salmo salar L., parr to pelletted and wild prey
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孵化场饲养的大西洋鲑鱼 Salmo salar L.、parr 对颗粒和野生猎物的反应
DOI：
10.1111/j.1365-2109.1987.tb00124.x
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发表时间：
1987
影响因子：
2
通讯作者：
J. Thorpe
中科院分区：
文献类型：
--
作者：
L. Stradmeyer;J. Thorpe
． 在相同颗粒宽度的试验水槽中，为大西洋鲑（Salmo salar L.）幼鱼提供颗粒或四种野生猎物（chironomid幼虫、ephemeropteran稚鱼Ecdyanurus和Baetis以及tnchopteran稚鱼Hydropsyche）的选择，16次试验（1.5 h）后，对野生食物的偏好增加，其中对Ecdyonurta和Hydropsyche的偏好最大，其猎物宽度鱼叉长度（PFR）分别为0.019和0.022。以棘球龙若虫为替代食物时，其对颗粒食物的排斥反应较以棘球龙幼虫为替代食物的排斥反应快（P < 0.05）。11次试验后对畸形龙的偏好达到（P < 0.05）， 15次试验后对摇尾鱼的偏好达到（P < 0.05）。捕获第一个猎物所需的时间是捕获野生猎物所需时间的两到三倍，并且对于任何类型的猎物都不会随着经验而改变。平均捕获距离不随经验变化。综上所述，野生猎物的可接受性不应限制颗粒饲料鲑鱼放归野外的生产性能。
. Juvenile hatchery-reared Atlantic salmon, Salmo salar L., were offered choices of pelletted or four types of wild prey (chironomid larvae, ephemeropteran nymphs Ecdyanurus and Baetis and tnchopteran larvae Hydropsyche) of the same particle widths, in a test flume Preference for wild foods increased over 16 trials (1·5 h), and was greatest for Ecdyonurta and Hydropsyche, which had prey width fish fork length (PFR) ratios of 0·019 and 0·022 respectively, Pelletted food was rejected sooner when Ecdyonurus nymphs were offered as the alternative food than when chironomid larvae were (P < 0·05). Pret'erence (P < 0·05) for Ecdyonurus was achieved after 11 trials and for chironomids after 15. The time required to capture the first prey item was two to three times as long for pellets as for wild prey and did not change with experience for any prey type. Mean capture distance did not change with experience. It is concluded that acceptability of wild prey should not limit performance of pellet-fed salmon released into the wild.