Volume 3, Issue 4 (2015)                   JFST 2015, 3(4): 93-96 | Back to browse issues page

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Study of different concentrations of green algae, Tetraselmis Suecica, on reproduction parametrs of marine rotifer Brachionus plicatilis. JFST 2015; 3 (4) :93-96
URL: http://jfst.modares.ac.ir/article-6-3395-en.html
Abstract:   (8897 Views)
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) higher than the other two treatments. Specific growth rate at concentrations of 3×106 cell/ml-1and 4.5×106 cell/ml-1 were significantly greater than concentrations of 1.5×106 cell/ml-1 of green algae (P<0.05). However, no significant differences were observed between the two treatments, medium and high. The maximum number of eggs and egg-bearing females were observed in the fourth and seventh days. Mean body size (lorica area) and egg size (bio-volume) in rotifers fed with high concentrations (4.5×106cell/ml-1) significantly greater than the mean body size of rotifers fed with medium (3×106 cell/ml-1) and low (1.5×106 cell/ml-1 ) concentrations while no significant differences were observed between low and medium treatments(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.
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Article Type: Short Communication Article | Subject: Fis nutrition
Received: 2014/06/10 | Published: 2015/02/20

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