ISSN:
1095-8649
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Both wild- and hatchery-reared brown trout Salmotrutta, 18 months of age and of the same genetic origin, responded with increased heart rates (tachycardia) to a simulated predator attack on 2 consecutive days. Brown trout reared in the hatchery showed a more rapidly induced tachycardia compared with wild-reared fish at day 1, but not day 2. During an undisturbed period several hours after attacks, hatchery-reared brown trout maintained higher heart rates compared to wild-reared fish on both days. Behavioural responses to the attack were very low for all fish, although hatchery-reared fish tended to be more active than wild fish after the attack day 2. The observed differences may have had a genetic background caused by different selection regimes in the hatchery- and wild-rearing environments, or could have been due to different phenotypic responses in the two environments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1095-8649.2005.00822.x
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