Breeding Season of the Sunray Surf Clam Mactra chinensis in Tomakomai, Southwest Hokkaido.

Abstract

BreedingSeason of the Sunray Surf Clam Mactra chinensis in Tomakomai,

The potential of marine bivalve Spisula sachalinensis as a marine temperature record

“…The species reaches sexual maturity at three years (Golikov and Scarlato, 1970), after which spawning takes place annually during the spring/early summer in Hokkaido (Kinoshita and Shibuya, 1920;Sakurai et al, 1992;Sasaki, 1981;Takamaru, 1976). In Primorje, Russian Far East, Golikov and Scarlato (1970) report spawning between late June and October.…”

“…One of the main aims of this work was to identify the seasonality of growth minima in S. sachalinensis from Tomakomai, as regular interruptions in shell growth result in biased (towards the season of fastest growth) or incomplete SST reconstructions. The ecological literature suggests that growth lines can be triggered variously by excessively warm water (Sasaki, 1981), cold water (Yamamoto, 1947) or by the end of the spawning season (Kato and Hamai, 1975) which falls in spring/early summer for Hokkaido (Kinoshita and Shibuya, 1920;Sakurai et al, 1992;Sasaki, 1981;Takamaru, 1976). In this project, nacreous growth lines were identified during sampling so that the samples representing these minima could be identified in the results.…”

Serotonergic Ligands Induce Spawning but not Oocyte Maturation in the Bivalve Mactra chinensis from Central Japan

“…M. chinensis supports an important bivalve fishery in Japan (Sakurai et al, 1992;Sakurai, 1993Sakurai, , 1994 and Korea (Chung et al, 1987). are closedly related species in the bivalve family Mactridae.…”