Influence of Water Temperatures in the Spawning Season of Scallop, Pecten (Patinopecten) yessoensis J_AY, upon Collecting Seed Scallops

Abstract

From the results of the experiment of collecting seed scallops which was made at Lake Saromako, Kitami, Hokkaidô, for four years, 1936-1939, conclusion can be drawn that the amount of setting seed scallops generally depends on the type of rise of water temperatures during the spawning season. Namely, the critical temperature of spawning of scallop in this district seems to be about 9°C, and the amount of setting seed scallops is great when the critical temperature occurs late in spawning season, (e.g. 1939), and is small when it, occurs early. (e.g. 1938).