Improvement of growth and nutritional value in diet microalgae for aquaculture by utilization of allelopathy

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Better understanding of the factors that affect the growth of microalgae used as feed in the aquaculture industry will help to improve the mass-cultivation methods. On the other hand, allelopathy refers to any direct or indirect inhibitory or stimulatory effect of one plant on another through the secretion of chemicals into the growth medium. For developing the mass-culture method of diet microalgae, in this study, we investigated the allelopathic effects of several microalgae on the growth of diet microalgae. Results indicated that growth of the haptophyte Pavlova lutheri was significantly improved by the addition of filtrate prepared from the diatom Chaetoceros neogracile, and growth inhibition of P. lutheri was induced by a self-growth inhibitor. Thus, control of concentration and utilization of allelochemicals will contribute to improving the mass-culture methodology of diet microalgae such as P. lutheri.