Comparative study on growth performance of mixed and monocultures of select marine microalgae

Xavier, Biji and Ranjan, Ritesh and Megarajan, Sekhar and Loka, Jayasree and Balla, Vamsi and Bathina, Chinnibabu and Shiva, Ponnaganti and Joseph, Shoji and Kizhakudan, Joe K (2024) Comparative study on growth performance of mixed and monocultures of select marine microalgae. In: Marine Fisheries Information Service No.259. ICAR- Central Marine Fisheries Research Institute, Kochi, pp. 34-36.

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Abstract

Microalgae forms an integral component of live feed for hatchery production of commercially valuable fish and shell fish. Microalgae has it application for maintaining green water rearing systems for larval rearing of finfishes as well as they form direct feed for the zooplankton component in the food chain and also for shellfish culture. Commonly used marine microalgae includes green algae (Chlorella sp., Nannochloropsis sp., and Tetraselmis sp.), diatoms (Chaetoceros sp. and Thalassiosira sp.) and flagellates (Isochrysis sp.). In general each microalgae species is being cultured separately and fed to the targeted species of culture. In this practice, the major drawback is that individual algae species may not be able to satisfy the nutritional requirement of the cultured finfish / shellfish larvae. At present, mixed cultures of microalgae is gaining importance as an important culture strategy to increase the production of microalgae. Mixed algal diets are regularly used in bivalve hatcheries as well as in marine finfish hatcheries. It is opined that in the mixed cultures, the growth characteristics, biochemical compositions, nutritional compositions and other growth factors are different from those of monocultures.

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