Intensive Culture of the Pacific White Shrimp Litopenaeus vannamei, under Limited Water Exchange - II. Indoor Post-Nursery Culture of Juvenile Shrimp -

사육수 비교환 방식에 의한 흰다리새우의 고밀도 사육 - II. 흰다리새우의 실내 중간양성 -

  • Jang, In-Kwon (West Sea Mariculture Research Center, National Fisheries Research & Development Institute) ;
  • Kim, Jong-Sheek (West Sea Mariculture Research Center, National Fisheries Research & Development Institute) ;
  • Seo, Hyung-Chul (West Sea Mariculture Research Center, National Fisheries Research & Development Institute) ;
  • Cho, Kook-Jin (West Sea Mariculture Research Center, National Fisheries Research & Development Institute)
  • 장인권 (국립수산과학원 서해특성화연구센터) ;
  • 김종식 (국립수산과학원 서해특성화연구센터) ;
  • 서형철 (국립수산과학원 서해특성화연구센터) ;
  • 조국진 (국립수산과학원 서해특성화연구센터)
  • Published : 2009.02.25

Abstract

Shrimp farming which is entirely conducted in outdoor ponds in the west coast of Korea has been suffered from mass mortality due to viral epizootics. Intensive indoor shrimp culture under limited water exchange can solve these problems of outdoor ponds including viral transmission from environment, pollution due to discharge of rearing water, low productivity and limited culture period. In this study, juvenile L. vannamei (B.W. 0.08-0.09 g) was stocked with $3,000-5,455/m^3$ in density in four raceway tanks (two $12.9\;m^2$, two $18\;m^2$ tanks) and cultured for 42 days with 2.7-3.4% of daily water exchange. Results from four tanks showed FCR of 0.79-1.29, survival of 38.2-48.0%, and yields of $2.49-4.22\;kg/m^3$ which is consistent with 12-20 and 8-14 times higher than those of commercial shrimp hatchery and outdoor pond in Korea, respectively. Concentrations of total ammonia nitrogen in all four tanks were 1.11-1.42 ppm in mean level and did not exceed 6.0 ppm (0.096 ppm of $NH_3$) which is still acceptable levels for shrimp growth. During the culture trial, concentration of $NO_2$-N rapidly increased from stocking, resulting in mean concentration of 18.45-22.07 ppm. It also exceeded 10 ppm over four weeks and maintained at 35-45 ppm for four days in all tanks, accounting for low survival of shrimp due to long-term exposure to high concentration of $NO_2$-N. Nevertheless, the results with survival rate over 38% from raceways which experienced the extreme $NO_2$-N levels suggests that under "biofloc system" white shrimp can acclimate to high $NO_2$-N concentration to some degree.

새우양식은 서해안의 축제식 양식장에서 거의 전적으로 이루어지고 있지만 최근 바이러스성 질병 피해와 생산성 저하로 해마다 피해가 증가하고 있다. 사육수 비교환 방식의 실내 고밀도 새우양식은 바이러스의 유입의 억제, 배출수에 의한 연안환경 오염 방지, 생산성 향상 뿐 아니라 출하시기의 조절 등 장점이 있어 축제식 양식장의 문제점을 해결할 수 있다. 본 연구는 타가영양을 기본으로 하는 BFT (biofloc technology) 방식으로 제작된 4개의 raceway형 tank (12.9, $18\;m^2$ 각 2개)에 흰다리새우 치하(B.W. 0.08-0.09 g)를 3,000-5,455 마리/$m^3$ 밀도로 입식하고 42일간 환수율 2.7-3.4%/day로 사육한 결과, 생산량은 $2.49-4.22\;kg/m^3$으로 일반 새우종묘배양장의 12-20배, 축제식 양식장의 8-14배에 달하였다. 수확시 tank에 따라서 새우의 평균 체중은 1.45-2.03 g, 생존율은 38.2-48.0%, FCR은 0.79-1.29이었다. 총암모니아성 질소의 농도는 평균 1.11-1.42 ppm이며 최고 6.0 ppm ($NH_3$ 농도, 0.096 ppm)까지 상승하였으나 새우에게 영향을 미칠만한 농도는 아니었다. 아질산성 질소는 사육 초기부터 꾸준히 상승하여 전 기간 평균 18.45-22.07 ppm으로 높게 유지되었다. 또한 아질산성 질소는 모든 tank에서 4주간 10 ppm 이상의 농도가 지속되었으며 후반기 4일 동안은 35-45 ppm의 높은 농도를 보여주어 새우의 생존에 영향을 미친 것으로 판단된다. 그러나 본 실험에서 보여준 장기간의 높은 아질산염의 농도에도 불구하고 최저 38%의 새우가 생존한 점은 BFT 조건 하에서 아질산염에 대한 새우의 적응능력을 설명해주며 이에 대한 기작과 내성한계 등에 대한 추가적인 추구가 필요할 것이다.

Keywords

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