モ場の魚の群集生態学的研究-II

Abstract

For observing interspecific relations between fishes living together around the outside of the Zostera area in Matsushima Bay, Miyagi Prefecture, composition of food was investigated on each of the eight fish species. Basing on the interrelation of food compositions, a trophic order within this fish group was presented just as in the series of the fish from the top to the bottom shown in Table 1. Sebastes inermis, “Mebaru”, grown and emigrated out of the Zostera area, is limited more strictly its feeding activities by many highly ranked fish species in this community than while it lived in the Zostera area. Among them, Sebastes oblongus and Sebastes schlegeli, predate the young of Sebastes inermis, predominated inside of the Zostera area. Among many problems involved in interspecific relations between fishes, relations between “Mebaru” and its food organisms, previously reported qualitatively, were analysed quantitatively by feeding experiments and the results will be reported in the third of this series.