Effect of Chlorella-based diets on growth of the silver carp, Hypophthalmichthys molitrix

Abstract

The Silver carp, Hypophthalmichthys molitrix, is a native species in China and Eastern Siberia, and has been internationally distributed all over the world. It is not only utilized as human food, but also appreciated by its ability to clean water reservoirs from clogging algae (FAO, 2005). Use of feed additives in aquaculture has received a considerable attention in recent years. Microalgae have a broad spectrum of nutritious compounds including proteins, vitamins, essential amino and fatty acids, minerals, and pigments (Becker, 2007). Feeding behavior studies have shown that many fish, including carnivorous fish, ingest algae as a food source. Thus, the use of algae as a feed additive might help in effective utilization of artificial diets in cultured fish (Mustafa & Nakagawa, 1995). Adding small amounts of micro algae into fish feeds improved growth rate, feed efficiency, body composition and disease resistance (Nakagawa et al., 1993).Among microalgae, Chlorella vulgaris is widely distributed in nature, especially in freshwater bodies. Chlorella vulgaris can survive by photo-autotrophy as well as heterotrophy utilizing external carbon source. Hence, Chlorella vulgaris is easily cultured ARTICLE INFO