Behavioural responses of krill and cod to artificial light in laboratory experiments

Most fishes and crustaceans respond to light, and artificial light sources may therefore be an efficient stimulus to manipulate behaviours in aquatic animals. It has been hypothesised that the catch efficiency of pots could be increased if prey, for example krill, can be attracted into the pots prov...

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Bibliographic Details
Published in:PloS one 2018-01, Vol.13 (1), p.e0190918-e0190918
Main Authors: Utne-Palm, A C, Breen, M, Løkkeborg, S, Humborstad, O-B
Format: Article
Language:English
Subjects:
Animal behavior
Aquatic animals
Baits
Biology and Life Sciences
Bioluminescence
Broadband
Cod
Commercial fishing
Crustaceans
Ecology and Environmental Sciences
Efficiency
Experiments
Fish
Fisheries
Fishing equipment
Gadus morhua
Krill
Laboratories
Laboratory experiments
Light
Light intensity
Light sources
Luminous intensity
Meganyctiphanes norvegica
Physical Sciences
Prey
Shellfish
Social Sciences
Studies
Swimming
Visual stimuli
Wavelength
White light
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Summary:Most fishes and crustaceans respond to light, and artificial light sources may therefore be an efficient stimulus to manipulate behaviours in aquatic animals. It has been hypothesised that the catch efficiency of pots could be increased if prey, for example krill, can be attracted into the pots providing a visual stimulus and a source of live bait. To find which light characteristics are most attractive to krill, we tested the effects of light intensity and wavelength composition on Northern krill's (Meganyctiphanes norvegica) behavioural response to an artificial light source. The most attractive individual wavelength was 530 nm (green light), while broadband (425-750 nm) white light was an equally attractive light source. The intensity of the emitted light did not appear to have a direct effect on attraction to the light source, however it did significantly increase swimming activity among the observed krill. The most promising light stimuli for krill were tested to determine whether they would have a repulsive or attractive effect on cod (Gadus morhua); These light stimuli appeared to have a slightly repulsive, but non-significant, effect on cod. However, we suggest that a swarm of krill attracted to an artificial light source may produce a more effective visual stimulus to foraging cod.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0190918