Study of different concentrations of green algae, Tetraselmis Suecica, on reproduction parametrs of marine rotifer Brachionus plicatilis

In recent years the use of rotifers as live food for rearing fish larvae and crustacean is very important. Growth and density is considered as an important factor in the production of rotifers. In this study, the effect of three different concentrations (1.5×106, 3×106, 4.5×106 cell/ml-1) of green algae, Tetraselmis Suecica, on growth, reproduction, body and egg size of marine rotifer, Brachionus plicatilis were investigated. Rotifers were cultured in standard conditions in 500 ml plastic containers. The initial density of rotifers in different treatments was 30 ind/ml. Based on the results, the highest density (331/67 ± 13/32) were showed in high concentration, which were significantly (P 0.05). The present study showed that the concentration of algae Tetraselmis suecica might be used in marine rotifer breeding and changing various concentrations, can produce various sizes of rotifers.