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Foraging Behavior in Beauty Goby, Pterogobius zacalles: Relationship between Foraging Modes and Prey Size  

Choi, Seung-Ho (National Institute of Biological Resources)
Publication Information
Korean Journal of Ichthyology / v.20, no.2, 2008 , pp. 123-128 More about this Journal
Abstract
The foraging behavior of the beauty goby, Pterogobius zacalles, was studied at Mutu Bay, Aomori province, Japan. P. zacalles harvested invertebrates prey from benthic substrates by using two distinct foraging modes: picking substrate among boulders and sucking surface of boulder. Among others, picking substrate among boulders was primarily used foraging mode. The foraging modes of P. zacalles were followed by three stages: searching for prey, feeding and chewing. For foraging, it takes less time to suck out the surface of boulder than pick up substrate among boulders, because the resting site of P. zacalles is close to the place where they do sucking. The diets of P. zacalles primarily consisted of benthic amphipods regardless of their foraging modes. Only the difference was that they can get bigger amphipods when they did picking rather than sucking. Even though it needs more time and energy to do picking, P. zacalles was compensated by getting a high-calorie diet eventually, therefore prey size can be the determinant of their foraging modes.
Keywords
Pterogobius zacalles; foraging modes; picking; sucking; amphipods; prey sizes;
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