1. 1 Partly presented in Abst. Metg. Japan Soc. Fisheries Sci., April, 1992, p. 225 (in Japanese).
2. 4 S. Arai et al.: Abst. Metg. Japan. Soc. Fisheries Sci., October, 1986, p. 147 (in Japanese).
3. 5 M. Kashiwagi: Abst. Metg. Japan. Soc. Fisheries Sci. October, 1992, p. 201 (in Japanese).
4. 6 H. Ito et al.: Abst. Metg. Japan. Fisheries Sci., April, 1992, p. 133 (in Japanese).
5. 7 K. Soyano et al.: Abst. Metg. Japan. Soc. Fisheries Sci., April, 1992, p. 134 (in Japanese).