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Survival of the early lavae of the Freshwater Crab, Eriocheir japonicus (De Haan) fed on different diets in the Laboratory

먹이종류에 따른 동남참게, Eriocheir japonicus(De Haan) 초기유생의 생존율

  • Published : 2002.08.01

Abstract

The survival of the early larvae of the freshwater crab, E. japonicus, fed on different diets at 22土1$^{\circ}C$ and 24$\pm$1% were studied in the laboratory. The larvae in the control (no feed) lived for 4 days (1~2 zoeal stages), and in the experimental container of non-living foods (egg Powder, soy bean Powder, Pellet Powder, millet Powder, and mussel meat), they were lived for 7~9 days (2~3 zoeal stages), When the larvae fed on phytoplankton (Chlorella ellipsoid., Skeletonema costatum. and Chaetoceros gracilis), they lived for 10, 18, and 19 days(3~5 zoeal stages), and fed on zooplankton (Artemianauplii and rotifer), they were reached to the juvenile stage in 24 and 25 days, respectivily. When the larvae fed on a mixed diets (see table 1). it was more effective than a single food diet, and the most effective diets included Chaetoceros gracilis, Artemia nauplii and rotifera, in which the larvae reached the juvenile stage in 22 days, and the survival was 73%.

동남참게 초기유생에 대한 다양한 먹이를 공급하여 먹이에 따른 어린게까지 소요 일수와 생존율을 수온 22$\pm$1$^{\circ}C$ 및 염분 24$\pm$1% 상태에서 조사한 결과는 다음과 같다. 무투여구에서는 5일만에 조에아 I~2기 상태에서 모두 사멸하였고, 살아있지 않은 먹이인 삶은 계란 난황 건조분말, 삶은 대두 건조분말, 인공배합사료 분말, 삶은 수수 건조분말, 새우 생육세편, 담치 외투막 생육세편를 공급한 실험구에세는 7~9일 까지 생존하였으며 유생의 형태는 조에아 2~3기 상태였다. 식물성 단세포인 C. ellipsoid, S. costatum, 및 C. gracilis를 각각 단독으로 공급하였을 때 각각 10, 18과 19일 까지 생존하였고, 유생의 형태는 조에아 3~5기 상태였고, 동물성 플랑크톤인 Artemia nauplii and rotifer를 공급하였을 때 각각 24일과 25일만에 치게로 변태하였고 이때의 생존율은 각각 43%와 25%이었다. 한편, 조류와 동물성 먹이를 혼합하여 공급하였을 때 단독공급시보다 모든 실험구에서 생존율이 높게 나타났고, 치게까지 도달하였다. 그 중에서 가장 효과가 좋았던 실험구는 규조류인 C. gracilis, Artemia nauplii and rotifer를 혼합공급한 실험구 이었고, 22일만에 치게로 변태하였으며 이때 생존율은 73%였다.

Keywords

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