Nutritional effect of freshwater Chlorella on growth of the rotifer Brachionus plicatilis
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Mass production of Brachionus plicatilis is usually accomplished by feeding so-called marine Chlorella (Nannochloropsis oculata) to the rotifers in marine fish hatcheries. If the marine Chlorella are in short supply, baker's yeast is usually used as a supplementary food. Recently, a condensed suspension of freshwater Chlorella (Chlorella vulgaris, k-22) was commercially developed as another supplementary food. We have evaluated the dietary value of this freshwater Chlorella for growth of the rotifer by means of individual and batch cultures. Rotifers cultured with the freshwater Chlorella suspension under almost bacteria-free conditions, showed very suppressed growth. However if the Chlorella was supplemented with vitamin B12 by adding the vitamin solution into the suspension or by culturing the Chlorella in a medium containing vitamin B12, the nutritional value of freshwater Chlorella was greatly improved and almost at the same level as that of marine Chlorella. Condensed Chlorella may therefore be effective as a supplementary food if vitamin B12 is supplied.
Key wordsFreshwater Chlorella nutritional effect Brachionus plicatilis Vitamin B12 supplementary food
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- Birch, L. C., 1948. The intrinsic rate of natural increase of an insect population. J. Anim. Ecol. 17: 15–26.Google Scholar
- Hirayama, K. & H. Funamoto, 1983. Supplementary effect of several nutrients on nutritive deficiency of baker's yeast for population growth of the rotifer Brachionus plicatilis. Bull. Japan. Soc. Sci. Fish. 49: 505–510.Google Scholar
- Maruyama, I., T. Nakamura, T. Matsubayashi & T. Maeda, 1986. Identification of the alga known as ‘marine Chlorella’ as a member of the Eustigmatophyceae. Jap. J. Phycol. 34: 319–325.Google Scholar
- Provasoli, L., K. Shiraishi & J. R. Lance, 1959. Nutritional idiosyncrasies of artemia and tigriopus in monoxenic culture. Ann. N. Y. Acad. Sci. 77: 250–261.Google Scholar
- Scott, J. M., 1981. The vitamin B12 requirement of the marine rotifer Brachionus plicatilis. J. mar biol. Ass. U.K. 61: 983–994.Google Scholar