Abstract
A laboratory culture of Ankistrodesmus gracilis algae was evaluated by studying the biology of the species and its chemical composition in a traditional medium (CHU 12 ) and in two alternative culture media, NPK (20-5-20) and macrophyte ( Eichhornia crassipes ) + NPK, in three different types of recipients (fiberglass, carboy and plastic bag). First peak in the growth curve of Ankistrodesmus gracilis occurred on the ninth day in macrophyte + NPK medium (74.16 x 10 5 cells mL -1 ) in a fiberglass recipient. However, highest density (p 12 (122.87 x 10 5 cells mL -1 ) in a plastic bag on the twelfth day. Cell density was over 70 x 10 5 cells mL -1 starting on the twelfth day. Growth rate of A. gracilis was similar (p > 0.05) in culture media in the three recipients. Protein and fiber were similar (p > 0.05) in the treatments, but lipids were higher (p -1 in NPK (p A. gracilis cultured in three types of recipients. Costs are low, occupying less space when cultured in plastic bags and in the laboratory.
Highlights
Grown microalgae are widely used in aquaculture as a preferred natural feed for zooplankton and fish larvae
Exponential increase in the growth curve of Ankistrodesmus gracilis occurred on the 9th day in the macrophyte + NPK medium (74.16 x 105 cells mL-1) in the glass fiber recipient
The highest number of cells was reported in medium CHU12 in a plastic bag (122.87 x 105 cells mL-1) on the 12th day
Summary
Grown microalgae are widely used in aquaculture as a preferred natural feed for zooplankton and fish larvae. Numerous algae species belonging to the Chlorophyceae family have been reported to contain high levels (25-50% dry weight) of neutral lipid. This fact suggests that this class of algae may Maringá, v. Laboratory culture of fresh water microalgae as feed for water organisms has been on the increase, even though certain problems still remain unsolved. These comprise production costs, nutritional value of live feed, adequate space-saving recipients for culture, appropriate management and production in the shortest time possible
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