Boujard T. auteur aut IRD Moreau Yann auteur aut IRD Luquet Pierre auteur aut IRD text journalArticle eng text/pdf reformatted digital access Low intensity colored light is very often used to observe or manipulate fish during the scotophase. According to data on fish vision, most species can perceive these wavelengths of light since their cone pigments have maximum absorption peaks around 455, 530 and 625 nm. To test whether Hoplosternum littorale can detect low intensity red or blue light, we attempted to entrain feeding activity, known to be nocturnal and synchronized by the circadian light/dark alternation, to such light. Feeding activity was entrained with either red or blue light, indicating that these fish can perceive these lights. In all cases, the fish fed during the darker phase of the light cycle. (Résumé d'auteur) specialized POISSON D'EAU DOUCE ETHOLOGIE NUTRITION ANIMALE EXPERIMENTATION RYTHME BIOLOGIQUE VARIATION TEMPORELLE INTENSITE LUMINEUSE RELATION ESPECE ENVIRONNEMENT 036EAUCON03 080ZOOGEN04 35 301-309 1992 0378-1909 https://www.documentation.ird.fr/hor/fdi:40468 10.1007/BF00001897 0378-1909 [F B40468] https://www.documentation.ird.fr/hor/fdi:40468 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_35-36/40468.pdf IRD - Base Horizon / Pleins textes 1994-09-30 2015-07-02 fdi:40468 fre