Effects of the size of abalone (Haliotis discus hannai) seeds stocked on the sea cage on growth
Young Dae Oh, Hyun Seok Jang, Yoon Ho Lee and Han Kyu Lim
Department of Marine & Fisheries Resources, Mokpo National University, 585-54, Korea
Long-term growth and survival rates were investigated in stocking size of Haliotis discus hannai seeds in sea cages. This study was conducted at the abalone cage culture in Bogil-do, Wando-gun, Jeollanam-do. The cage used in the experiment was 2.4 m × 2.4 m, and Undaria pinnatifida and Saccharina japonica were supplied as diet. The size of sea cage stocking seeds was divided into groups A (3.2 to 3.6 cm), B (2.9 to 3.2 cm), C (2.6 to 2.9 cm), and D (less than 2.6 cm) based on each Shell length. During the experiment, the salinity and pH were maintained at constant values, and the water temperature and dissolved oxygen content showed seasonal changes, but they were suitable for rearing abalone. As a result of rearing for 722 days, the survival rate did not show a significant difference between the experimental groups except for group D, which was excluded from the experiment due to the large number of early mortality when the cage was stocked. The growth of seeds gradually narrowed as the rearing period lengthened after stocking at sea cages, and there was no significant difference between A, B, and C after 722 days. In conclusion, it was found that the stocking size of early seeds did not affect productivity during long-term rearing.
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