Production and Hatching Rate of Resing Egg of Korean Rotifer, Brachionus plicatilis (S-type) with Different Diets

먹이에 따른 한국산 S-tyoe Rotifer, Brachionus plicatilis의 내구란 생산과 부화율

  • Park, Heum-Gi (Department of Aquaculture, Pukyong National University) ;
  • Hur, Sung-Bum (Department of Aquaculture, Pukyong National University)
  • Published : 1996.11.01

Abstract

Dietary values of phytoplanktons, concentrated Chlorella and commercial yeasts were investigated for the resting egg production of the Korean rotifer, B. plioatilis S-type. The hatching rate of the resting egg of the rotifer fed on different diets was also studied. The highest production of the resting egg was 3,760 eggs/20 ml with N. oculata. However, the hatching rate was not significant among 4 phytoplankton species. The highest production of resting eggs among 9 diet groups ($\omega$-yeast, baker's yeast, 2 refrigerated Marine Chlorella, frozen Marine Chlorella, frozen Chlorella ($70\%$) + baker's yeast ($30\%$), frozen Chlorella ($30\%$) + baker's yeast ($70\%$), 2 refrigerated freshwater Chiorella) was 283 eggs/ml in the frozen Chlorella ($30\%$) +baker's yeast ($70\%$) and the refrigerated freshwater Chlorella. The highest number of resting egg from 10,000 rotifers and 1 mg dry wieght diet was 5,566 eggs and 2,131 eggs in the frozen Chlorella ($30\%$) + baker's yeast ($70\%$). However, the highest hatching rate of the resting eggs was $67.4\%$ in $\omega$-yeast. In this study, the results suggest that the baker's yeast with a small amount of frozen Chlorella seems to be good feeding regime for the economical production of resting eggs.

한국산 rotifer, B. plicatilis, S-type를 대상으로 식물부유생물, 농축 Chlorella 및 효모류에 대한 내구란 생산과 먹이 종류에 따라 생산된 내구란의 부화율을 조사하였다. 4 종류(Chlorella ellipsoidea, Nannochloris oculata, Tetraselmis suecica, Pavlova lutheri) 가운데 N. oculata는 3,760개/20 ml로 가장 많은 내구란을 생산하였다. 그러나 식물부유생물 종류에 따른 부화율의 유의적인 차이는 없었다. 9 종류의 농축먹이(유지효모, 빵효모, 두 종류의 해수산 농축 냉장 Chlorella, 해수산 냉동 Chlorella, 냉동 해수산 Chlorella ($70\%$)+ 빵효모($30\%$), 냉동 해수산 Chlorella ($30\%$)+ 빵효모($70\%$), 두 종류의 냉장 담수산 Chlorella)에서 내구란 생산이 가장 많은 먹이는 냉동 Chlorella($30\%$)+빵효모($70\%$)와 냉장 담수산 Chlorella에서 각각 283개/ml로 나타났다. Rotifer $10^4$개체와 건조 먹이 1 mg당 내구란 생산은 냉동 Chlorella ($30\%$)+빵효모($70\%$)에서 각각 5,566개와 2,131개로 가장 높게 나타났다. 농축 먹이에 따른 내구란의 부화율은 유지효모가 $67.4\%$로 가장 높았다. 본 연구의 결과, 경제적인 내구란 생산을 위하여 빵효모와 농축 냉동 Chlorella를 혼합하여 공급하는 것이 효과적인 것으로 판단된다.

Keywords