Chlorella cultivation for mass culture of rotifer, Brachionus Plicatilis I. Selection of suitable Chlorella species

Rotifer (Brachionus Plicatilis) 사육을 위한 Chlorella의 배양 1. 적종 Chlorella의 선택

Rotifers became an important live food for fish larvae, especially for marine fishes, and Chlorella has been used as a very useful food for the mass culture of rotifer. However, not many tests for suitable Chorella species for the mass culture of rotifer were done and many of Chlorella sp. have been used without consideration of species for this purpose. There-fore, two species of marine Chlorella and four species of freshwater Chlorella were tested to select suitable species for the mass culture of a rotifer, Brachionus plicatilis. These Chlorella species were cultured in five different culture media; f/2, Erdschreiber, Complesal for marine species and S$\cdot$K, Wai and Complesal for freshwater species. Proximate analyses were done to see the protein, lipid and ash contents of a marine species, C. ellipsoidea and a freshwater species, C. vulgaris. Amino acids content of these species were also tested. C. ellipsoidea and C. vulgaris showed better growth than the other species. For marine Chlorella sp., f/2 media was better than Erdschreiber and Complesal. But for the freshwater species, Complesal showed the best result in growth. By the proximate analyses, C. ellipsoidea has higher lipid contents whereas C. vulgaris has higher protein and ash. In the analysis of amino acid of Chlorella, it was remarkable that freshwater Chlorella, C. vulgaris, has high content of $NH_3$ comparing with marine Chlorella, C, ellipsoidea. According to the above results, C. vulgaris seems have higher possibilities for mass culture of rotifer but further studies are needed.

해산어류 및 갑각류의 유생사육시 먹이로 사용되는 rotifer(Brachionus Plicatilis)의 먹이생물로 이용되는 Chlorella중 어떤종이 대량사육에 가장 적합한가를 파악하기 위하여 해수산 Chlorella 2종, 담수산 Chlorella 4종에 대한 성장 및 영양염분석의 결과를 요약하면 다음과 같다. 1. 해수산 Chlorella중에서는 C. ellipsoidea가 f/2배지에서 가장 높은 성장을 나타냈고 담수산 Chlorella 중에서는 C. vulgaris가 Complesal에서 가장 높은 성장을 보였다. 2. 성장의 측면에서 볼 때 담수산인 C. vulgaris는 해수산인 C. ellipsoidea보다 specific growth rate가 1.68배나 높게 나타났다. 3. 영양염의 측면에서 볼 때 지방은 해수산인 C. ellipsoidea가 조단백과 회분은 담수산인 C. vulgaris가 더 높았다. 아미노산측정에서 $NH_3$의 함량이 담수산인 C. vulgaris가 해수산인 C. ellipsoidea보다 8배 이상 높은 점이 특이하였다.