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cycles nycthéméraux

Aquatic Living Resources (1)

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Entrainment of the circadian rhythm of food demand by infradian cycles of light-dark alternation in Hoplosternum littorale (Teleostei)
Thierry Boujard, Yann Moreau, Pierre Luquet
Journal:

Aquatic Living Resources / Volume 4 / Issue 4 / October 1991

Published online by Cambridge University Press:

15 October 1991, pp. 221-225

Print publication:

October 1991
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Hoplosterum littorale (Hancock, 1828) shows a marked circadian rhythm of food demand. Feeding activity is mainly nocturnal, with two peaks, and is synchronized with the diel light cycle. We tested the effect of infradian (period >28 h) light/dark cycles on this rhythm in fish with demand-feeders: fish subjected to a 13.5 L/22.5 D light/dark cycle for 8 days and a 25.5 L/10.5 D cycle for a further 8 days showed a strictly nocturnal feeding activity, a response that only passively reflected the cyclic alternation of light and dark.