| Abstract | Behavioral observations are described for the pike blenny, Chaenopsis ocellata, under aquarium conditions. The species is strongly territorial and well suited for aquarium study. Resting, threat, attack and feeding patterns are discussed. A multicolored spot in the spinous dorsal fin and the azure branchiostegal membranes play important roles in threat and attack behavior, as does erection of the dorsal fin, gaping of the mouth and a change in respiration rate. Some notes are provided for Chaenopsis alepidota a related species from the eastern Pacific, but detailed comparison of the 2 species is not yet possible. || ABSTRACT AUTHORS: C. R. Robins
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