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Acquired predator recognition in juvenile rainbow trout (Oncorhynchus mykiss): conditioning hatchery-reared fish to recognize chemical cues of a predator

Title:

Acquired predator recognition in juvenile rainbow trout (Oncorhynchus mykiss): conditioning hatchery-reared fish to recognize chemical cues of a predator

Brown, Grant E. and Smith, Jan F. (1998) Acquired predator recognition in juvenile rainbow trout (Oncorhynchus mykiss): conditioning hatchery-reared fish to recognize chemical cues of a predator. Canadian Journal of Fisheries and Aquatic Sciences, 55 (3). pp. 611-617. ISSN 0706-652X

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Official URL: http://dx.doi.org/10.1139/cjfas-55-3-611

Abstract

In this study, we exposed predator-naive, hatchery-reared juvenile rainbow trout (Oncorhynchus mykiss) to the chemical stimuli from northern pike (Esox lucius) and either trout skin extract (a chemical alarm signal) or a distilled water control to test for acquired recognition of a novel predator. Trout exposed to conspecific skin extract and pike odour significantly increased antipredator behaviour (i.e., decreased foraging and area use and increased shoaling and freezing), while those exposed to distilled water and pike odour did not. Conditioned trout were exposed to pike odour alone (versus a distilled water control) either 4 or 21 days later. When presented with pike odour 4 days postconditioning, trout significantly increased antipredator behaviour (i.e., decreased foraging and area use and increased time under cover and freezing). Trout tested 21 days postconditioning still exhibited a significant increase in antipredator behaviours when presented with pike odour alone (i.e., decreased foraging and increased freezing). These data are the first to demonstrate that hatchery-reared trout can be conditioned to recognize the chemical cues of a predator and suggest that this may serve as a strategy to train hatchery-reared fish to recognize predators prior to stocking into natural waterways.

Divisions:Concordia University > Faculty of Arts and Science > Biology
Item Type:Article
Refereed:Yes
Authors:Brown, Grant E. and Smith, Jan F.
Journal or Publication:Canadian Journal of Fisheries and Aquatic Sciences
Date:March 1998
Funders:
  • Canadian Department of Fisheries and Oceans
  • Natural Sciences and Engineering Research Council
  • University of Saskatchewan
ID Code:6732
Deposited By:DANIELLE DENNIE
Deposited On:18 Jun 2010 14:31
Last Modified:08 Dec 2010 18:14
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