Abstract:
:The influence of hunger level and predation risk on habitat choice and foraging in crucian carp, Carassius carassius, were studied in a laboratory experiment. Experiments were carried out in aquaria with or without a predator (pike, Esox lucius). Habitat use and foraging activity of three-fish foraging groups of either fed or hungry crucian carp were studied. Fish were allowed to choose between an open (risky) habitat with Tubifex worms and a habitat with dense vegetation (safe) without food. Habitat use was significantly affected by both risk of predation and hunger level. Crucian carp spent less time in the open habitat when there was a predator present and they also spent less time there when fed than when hungry. Furthermore, there was a significant interaction between risk of predation and hunger level, indicating a state-dependent trade-off between food acquisition and predator avoidance.
journal_name
Oecologiajournal_title
Oecologiaauthors
Pettersson LB,Brönmark Cdoi
10.1007/BF00320988subject
Has Abstractpub_date
1993-09-01 00:00:00pages
353-357issue
3eissn
0029-8549issn
1432-1939pii
10.1007/BF00320988journal_volume
95pub_type
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