Survey of Feeding Stimulants for te Sea Bream (Chrysophrys major)

Abstract

As a preliminary study to identify feeding stimulants for the sea bream, Chrysophrys major, aqueous methanolic extracts of many kinds of aquatic organisms were fractionated into acetoneinsoluble (B), acetone- and ether-soluble (C), and acetone- and water-soluble (A) fractions, and their stimulatory potencies were assayed. Results obtained are summarized as follow.
(1) In most of the aquatic animals examined, the strongest activities were found in Fr. B.
(2) Among various algae tested, only Fr. A of two species, Endarachne binghamiae and Porphyra suborbiculate, was stimulative, but its activity was weader than that of Fr. B of animal origin.
(3) In viscera of the squid, Todarodes pacificus and whole body of the mysid shrimp, Anisomysis ijimai, all of the three fractions induced active feeding behaviors.