ISSN : 1225-3480
본 연구는 해상가두리에서 2년 동안 수용밀도별로 사육된 북방전복 (Haliotis dicus hannai) 의 성장 및 생존율 조사를 통해 적정 수용밀도를 구명하고 생산성을 향상시키고자 수행 하였다. 수용밀도는 쉘터 단면적 당 점유율로 15, 30, 45, 60 percentage <TEX>$(=per.)/m^2$</TEX>로 설정하여 약 1년을 기준으로 1차 양성기간 (the primary rearing period, PRP), 2차 양성시간 (the second rearing period, SRP) 으로 실시하였다. PRP와 SRP의 1년간 평균 수온은 <TEX>$2^{\circ}$</TEX>의 차이를 보였다. PRP의 북방전복 (평균각장 <TEX>$36.14{\pm}2.28mm$</TEX>) 은 성장에서 각장과 각폭의 절대성장율 (absolute growth rate, ARG), 일간성장율 (daily growth rate, DGR), 특수생장율 (specific growth rate, SGR) 에서 <TEX>$15per./m^2$</TEX> 유의적으로 높았고 (P < 0.05), 생존율은 차이가 없었다. SRP의 북방전복 (평균각장 <TEX>$55.26{\pm}6.93mm$</TEX>) 은 ARG, DGR, SGR에서 <TEX>$45per./m^2$</TEX>제외한 실험구간 유의적 차이는 없었으며, 생존율은 저밀도인 15, <TEX>$30per./m^2$</TEX>는 70% 이상을 보였으나, 고밀도인 45, <TEX>$60per./m^2$</TEX>는 각각 31%, 9%이하였다. 본 실험결과 해상가두리 내에서 각장 3-4 cm 북방전복의 1차 양성기간 적정 수용밀도는 <TEX>$15per./m^2$</TEX> (<TEX>$2.4{\times}2.4m$</TEX>, 1칸 당 750마리) 가 적정하였다. 2차 양성기간 육성용 북방전복 (각장 5-6 cm) 은 경제성을 고려하여 <TEX>$30per./m^2$</TEX>인 양성하는 것이 양식 생산성을 향상시킬 수 있을 것으로 판단된다.
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.
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