The escape response of food-deprived cod larvae (Gadus morhua L.) |
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Authors: | Katrine Skajaa Howard I. Browman |
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Affiliation: | a University of Bergen, Department of Biology, PO Box 7800, N-5020 Bergen, Norway b Institute of Marine Research, Austevoll Research Station, N-5392 Storebø, Norway |
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Abstract: | The escape response of Atlantic cod larvae (Gadus morhua) 25 and 47 days post hatch (dph) - either fed or deprived of food for three days - was studied. Larval escape responses were provoked by water movement from the suction of a fixed-position pipette. Escape latency, distance, speed, burst speed, and vertical and lateral escape angles were quantified using motion tracking software designed for 3-D silhouette video recordings. Escape performance, expressed as escape distance and escape speed, improved with age. The escape angles were normally distributed and highly variable, ranging from − 170° to 170° and − 40° to 105° for lateral and vertical escape angles respectively. No food deprivation-induced effects in any of the behaviours were found, suggesting that there are no condition-related behavioural effects (size-independent effects) in escape response performance after 3 d of food deprivation. This may reflect a negligible difference in the cost/benefit equation for fed vs. food-deprived larvae in performing an escape response when under attack. |
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Keywords: | Anti-predatory behaviour Atlantic cod larvae Escape response Food deprivation Gadus morhua |
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