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The sinergetic effect of temperature and salinity on rotifer Brachionus plicatilis (O.F. Muller)population growth and lorica size in mass rearing

The sinergetic effect of temperature (22,27,35 C) and salinity (20,27,38 psu) on population growth and changes in lorica length and width of the rotifer Brachionus plicatilis was investigated under mass rearing conditions.The greatest average population density (432,4 ind/ml)and the fastest doubling time (D=17,2 h) was noted at a salinity of 20 psu and at 22 C. Daily harvesting 50-60% of the contents of one 400 l volume tank, satisfied the food intake of 500000-600000 reared fish larvae. Various salinity and temperature combinations resulted in significantly different lorica sizes (ANOVA, P<0,001). This shows that it is possible to produce rotifers with the required lorica size, depending of the functional mouth gape of larvae.

Brachionus plicatilis; lorica size; mass rearing; salinity; temperature

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