1. Department of Food Science and Technology, National Fisheries University; Nagatahonmachi Shimonoseki 759-6595 Japan
2. Faculty of Agriculture; Yamagata University; Tsuruoka Yamagata 997-8555 Japan
3. Department of Applied Aquabiology; National Fisheries University; Nagatahonmachi Shimonoseki 759-6595 Japan