Fish mucus versus parasitic gnathiid isopods as sources of energy and sunscreens for a cleaner fish

摘要: The cleaning behaviour of the bluestreak cleaner wrasse Labroides dimidiatus is extensively used as a model system for understanding cooperation. It feeds mainly on blood-sucking gnathiid isopods and also epidermal mucus client fish; nutritional quality these foods, however, unknown. reef fish contains ultraviolet (UV)-absorbing compounds (mycosporine-like amino acids, MAAs), which are only obtained via diet; nevertheless, while La. has high amounts MAAs in its mucus, their source Therefore, energetic value (calories protein estimated using carbon nitrogen) MAA level gnathiids from several clients [parrotfishes, wrasses (Labridae), snapper (Lutjanidae)] were determined. varied among fishes. Overall, carbon, nitrogen, calories, per dry weight higher most species compared to gnathiids. Thus, depending species, may be energetically more advantageous feed than UV absorbance, confirmed proxy levels, indicated levels whereas had no detectable MAAs. This suggests that obtain but not Hence, addition energy, some provides with added bonus UV-absorbing compounds. explain why prefer over isopods. likely costs benefits removal protecting parasitic gnathiids, respectively, variation gained by feeding foods cooperation interactions.