Studies on the feeding attractants for fishes and shells. The attractive effect of seaweeds based on the behavioral responses of young herbivorous abalone Haliotis discus.

Abstract

It has been clarified that the attractive effect of seaweeds on young herbivorous abalone could be presented as the coefficient a of a logistic curve, y=g/{1+exp[-r(j-a)]} in the time-couse of abalone that remained in the test compartment. The attractive effect of three phyla of seaweeds was examined on the basis of behavioral responses of abalone. Among six specimens tested in the green algae, Chaetomorpha spirallis- “Hosojuzumo” in Japanese, Ulva Pertusa- Anaaosa and Caulerpa okamurai- “Fusaiwazuta” were found to be effective in attracting abalone. Among twelve specimens in hte brown algae, strong attractants were Sargassum hemiphyllurm- “Isomoku”, Pachydictyon coriaceum- “Sanadagusa”, Ishige okanurai- “Ishige” and Padina arborescens- “Umiuchiwa”. Amongst fourteen specimens in the red algae, only two species, Gelidium amansii- “Makussa” and Gelidium divaricatum- Himetengusa provoked exploratory and feeding behavior.