水産動物のビタシンB₁₂について-V

ヒトデのビタミンB₁₂について(其の二)

抄録

Succeeding the previous report¹⁾, further studies have been pursued as to the vitamin B₁₂ contents of the yellow starfish (Asterias amurensis Lütken^*) and ether species.
The vitamin B₁₂ contents of starfish, in the pyloric caecum, gonad or body wall, were determined by the microbiological assay using Eugiena gracilis.
Experimental results:
1. Seasonal variation of vitamin B₁₂ contents of Ast. amurensis in TOKYO Bay was measured. The spawning season of this species was found to extend from January to April in that area, and the vitamin B₁₂ level of the pyloric caecum in the individuals captured before spawning is much higher than that of those having completed spawning (Table 1).
2. Among various species investigated, Asterina pectinifera was found to be richest in vitamin B12 content in the pyloric caecum (Table 3).
1) M. Y_ANASE: Bull. Jap. Soc. Fish., 19, 1200 (1954).
^* The sientific name of the yellow starfish has been corrected as avobe, instead of Asterias
amurensis versicolor Sladen used in the previous report.