1. 1Department of Fisheries, Kinki University, Nakamachi 3327-204, Nara 631-8505, Japan
2. 2Uragami Experimental Station, Fisheries Laboratory of Kinki University; Uragami 468-03, Yakayama 649-5145, Japan
3. 3Oshima Experimental Station, Fisheries Laboratory of Kinki University, Oshima 1790-4, Yakayama 649-3633, Japan