북방전복, Haliotis discus hannai의 해상가두리 양성 시 적정 수용밀도에 관한 연구 = A Study on the Optimum Stocking Density of Abalone, Haliotis discus hannai, reared in Net Cage Culture

국문 초록 (Abstract)

본 연구는 해상가두리에서 2년 동안 수용밀도별로 사육된북방전복 (Haliotis dicus hannai) 의 성장 및 생존율 조사를통해 적정 수용밀도를 구명하고 생산성을 향상시키고자 수행하였다. 수용밀도는 쉘터 단면적 당 점유율로 15, 30, 45, 60 percentage (= per.)/m2로 설정하여 약 1년을 기준으로 1차양성기간 (the primary rearing period, PRP), 2차 양성시간 (the second rearing period, SRP) 으로 실시하였다.
PRP와 SRP의 1년간 평균 수온은 2℃의 차이를 보였다. PRP 의 북방전복 (평균각장 36.14 ± 2.28 mm) 은 성장에서 각장과 각폭의 절대성장율 (absolute growth rate, ARG), 일간성장율 (daily growth rate, DGR), 특수생장율 (specific growth rate, SGR) 에서 15 per./m2 유의적으로 높았고 (P < 0.05), 생존율은 차이가 없었다. SRP의 북방전복 (평균각장55.26 ± 6.93 mm) 은 ARG, DGR, SGR에서 45 per./m2제외한 실험구간 유의적 차이는 없었으며, 생존율은 저밀도인15, 30 per./m2는 70% 이상을 보였으나, 고밀도인 45, 60 per./m2는 각각 31%, 9%이하였다. 본 실험결과 해상가두리내에서 각장 3-4 cm 북방전복의 1차 양성기간 적정 수용밀도는 15 per./m2 (2.4 × 2.4 m, 1칸 당 750마리) 가 적정하였다. 2차 양성기간 육성용 북방전복 (각장 5-6 cm) 은 경제성을고려하여 30 per./m2인 양성하는 것이 양식 생산성을 향상시킬 수 있을 것으로 판단된다.

다국어 초록 (Multilingual Abstract)

The effects of different stocking densities on the growth and survival rate of the abalone, Haliotis discus hannai, were investigated in marine net cage for two years. Stocking density was set 15, 30, 45 and 60 percentage (= per.) /m2 with share to cross-sectional area ​​per shelter. The primary rearing period (PRP) and the secondary rearing period (SRP) were conducted by a year. One year mean water temperature of PRP and SRS showed the difference about 2℃. In the growth (initial mean shell length of abalone : 36.14 ± 2.28 mm) of PRP, the absolute growth rate (ARG), daily growth rate (DGR) and specific growth rate (SGR) of the 15 per./m2 were higher than those of density groups (P < 0.05). Survival rates of all density groups were showed no significant difference. In the growth (mean shell length of abalone : 55.26 ± 6.93 mm) of SRP, ARG, DGR and SGR of stocking density groups showed no significant difference except for 45 per./m2 density group. Survival rate in the low-density (15, 30 per./m2) was more than 70%, and those of the high-density (45, 60 per./m2) were less than 31% and 9%, respectively. These results showed that the appropriate stocking density for 15 per./m2 was seven hundred fifty number per one net cage (2.4 × 2.4 m), during PRP using 3-4 cm abalone in length. Also for the secondary rearing period, the optimal stocking density (shell length 5-6 cm of abalone) consider with the economical efficiency was determined to be 30 per./m2, resulting the productivity improved.

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