Biology of cladocerans and copepods in Ise bay - 2 : Vertical distribution of neritic copepods in relation to their life histories

概要

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Ontogenetic change of vertical distribution of copepods was investigated in detail with Van-Dorn water sampler during the daytime in three occasions in Ise Bay along the Pacific coast of central Japan.We placed great importance on the dominant copepods such as Acartia, Calanus sinicus,Paracalanus parvus　and Oithona brevicornsis．The copepods Acartia, Calanus and　Paracalanus, which shed eggs free in water, showed remarkable ontogenetic change. The eggs and nauplii were found largely in 2-8m layers; the adults in the water much close to the bottom of the bay;the copepodites in the intermediate layers. Three reults indicate that to sample copepods quantitatively during the daytime is difficult. Furthermore, our investigation showed that any life stage,especially the eggs, were always found in aggregations. This suggests that the adult females tend to swarm for releasing their eggs, presumably at night.On the other hand, Oithona which carries eggs until nauplii emerge did not show such ontogenetic change.This copepod was found mainly in 0-8m layers through the life cycle.
三重大学水産学部の論文
1985-10-01