Artificial seed production of short neck clam Ruditapes philippinarum in Yamaguchi prefecture [Japan]
1997
"Tateishi, T. (Yamaguchi-ken. Fisheries Research Center (Japan). Inland Sea Division) | Ideo, H. | Kishioka, M. "
"We completed the technique to constantly produce the artificial seeds of the short neck clam Ruditapes philippinarum in large scale, because its natural resources have seriously been decreased in Japan. In Yamaguchi Prefecture 10E7 seeds of l-2mm in shell size have been able to obtain in a 100 cube m tank from 1992, and about 2*10E7 seeds were produced annually. For increasing the survival rate of the released seeds, the intermediate culture of them until 10mm in shell size was carried out mainly by Yamaguchi Prefectural Fisheries Station and ten Fisheries Cooperative Associations. The large scale seed production of this clam and its intermediate culture are described in detail. We, furthermore, present the results on the production of the seeds bearing a special color pattern on the shell as a marker of the released seeds. Bp (banded purple) type shell, which is very rare in the fields, could be fixed genetically by the group and individual inbreedings. In 1996 we obtained the fourth generation of the Bp type shell at the rate of 92.5% in the group inbreeding experiments and nearly 100% in the individual inbreeding experiments. A pert of them were released to the fields after the intermediate culure."
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