伊勢湾産イカナゴの体長の個体変異と個体群密度の関係

Abstract

The chief of factors affecting body length-variations of a sand eel Ammodytes personatus were studied in Ise Bay. Mean body size and growth rate of first year sand eel in fourteen year-classes varied considerably among the year-classes. The relative variation in individual fish size, coeffi-cient of variation (CV), in each year-class was inversely related to population density and was thus density-dependent. The causes of density-dependent fluctuation of the variation were dis-cussed.