USE OF BIOFUEL BY-PRODUCT FROM THE GREEN ALGAE Desmochloris sp. AND DIATOM Nanofrustulum sp. MEAL IN DIETS FOR NILE TILAPIA Oreochromis niloticus

Abstract

Algal by-product meals from the Hawaiian biofuels industry were evaluated as ingredients in diets for ju­veniles of Nile tilapia (Oreochromis niloticus). Four experimental diets were formulated to fulfill fish nutri­tional requirements. The diets were made with fish meal, soybean meal, whole diatom (Nanofrustulum sp.) meal, or defatted green algae (Desmochloris sp.) meal as the test ingredients. A feeding experiment with juvenile tilapia of 2.6 ±0.1 g initial weight was carried out in a freshwater recirculation system with each diet treatment tested in triplicate tanks. Fish were fed the experimental diets to apparent satiation twice a day for 12 weeks and fish weight was measured every three weeks. Water temperature was maintained at 22.7 ±0.8 °C, salinity at 0.1 ±0.0 ppt and dissolved oxygen at 5.6 ±0.5 mg/L. At the end of the experiment a significant effect (P<0.05) of diet treatments was found in fish growth and feed utilization, with specific growth rate, food conversion ratio, and retained nitro­gen efficiency being highest for the green algae-based diet. Lipid content in the diets was lower than ex­pected for the algae diets. Proximate composition analysis showed no significant difference (P>0.05) in the protein content of the fish bodies among the diets. Results indicate the suitability of the green algae by-product meal as an ingredient in Nile tilapia diets. Diatom meal also showed interesting potential for use as an ingredient in tilapia feeds.

Keywords

• Nile tilapia,microalgae,diatom,green algae,fish feeds,Hawaii

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