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Mer de Sulawesi - Indonésie - Couple de crevettes empereurs (Periclimenes imperator) sur un couple de nudibranches ou limaces de mer (Risbecia tryoni). Les nudibranches (mollusques sans défense apparente) se protègent de leurs prédateurs (principalement les poissons) par leurs couleurs frappantes. Dans le monde sous-marin cette couleur vive, loin d'être un ornement gratuit, est plutôt un signe répulsif : attention danger, poison ! parfois on peut observer un poisson qui a eu l'audace de picorer un nudibranche, le recracher immédiatement. Ces belles couleurs cachent en fait un goût terrible et des toxines redoutables. Ici, la crevette tire à profit ces caractéristiques pour sa propre sécurité Sulawesi sea - Indonesia - A pair of Imperial shrimps (Periclimenes imperator) on a pair of nudibranchs or seaslugs (Risbecia tryoni). The protection of the nudibranchs or seaslugs (mollusks with no apparent means of defense) is only their bright colors. In fact, bright multi-colored costumes serve as a warning: see me from afar but I?m no good to eat ! These colors are more a repellent in the chemical warfare. It says : "pay attention, danger, I am poisonous" ! Filled with acids that they produce or with toxins that they extract from their prey, they become fairly unappetizing. We can observe sometimes a fish trying to swallow a seaslug. After one encounter, it is unlikely that the fish will try again. Here, the shrimp takes profit in this strategy of defense
