Sludge-Grown Algae for Culturing Aquatic Organisms: Part II. Sludge-Grown Algae as Feeds for Aquatic Organisms

Environmental Management
M H WongS T Chiu

Abstract

This project investigated the feasibility of using sewage sludge to culture microalgae (Chlorella-HKBU) and their subsequent usage as feeds for rearing different organisms. Part II of the project evaluated the results of applying the sludge-grown algae to feed Oreochromis mossambicus (fish), Macrobrachium hainenese (shrimp), and Moina macrocopa (cladocera). In general, the yields of the cultivated organisms were unsatisfactory when they were fed the sludge-grown algae directly. The body weights of O. mossambicus and M. macrocopa dropped 21% and 37%, respectively, although there was a slight increase (4.4%) in M. hainenese. However, when feeding the algal-fed cladocerans to fish and shrimp, the body weights of the fish and shrimp were increased 7% and 11% accordingly. Protein contents of the cultivated organisms were comparable to the control diet, although they contained a rather high amount of heavy metals. When comparing absolute heavy metal contents in the cultivated organisms, the following order was observed: alga > cladocera > shrimp, fish > sludge extracts. Bioelimination of heavy metals may account for the decreasing heavy metal concentrations in higher trophic organisms.

References


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Citations

Jul 16, 2009·Archives of Environmental Contamination and Toxicology·S Y LeungM H Wong
Mar 11, 2006·Environmental Geochemistry and Health·K C Cheung, M H Wong
Nov 17, 2005·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Kai-Yip KongMing-Hung Wong
Jan 17, 2019·International Journal of Systematic and Evolutionary Microbiology·Jeeva Susan AbrahamRavi Toteja
Nov 1, 2013·Comprehensive Reviews in Food Science and Food Safety·M van der SpiegelH J van der Fels-Klerx

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