Abstract
We investigated the optimum salinity and temperature conditions for the mass culture of small rotifer, Proales similis. In the salinity experiment ranging from 1, 5, 10, 15, 20, 25 and 33‰, growth tended to decrease with salinity increase. Most agreeable salinity for rotifer growth was 1‰ in which maximum density and specific growth rate (SGR) were obtained. In the temperature experiments ranging from 15, 20, 25, 30 and <TEX>$35^{\circ}C$</TEX>, continuous growth of rotifer populations was found up to <TEX>$35^{\circ}C$</TEX>. The highest maximum density (2,060 inds./mL) of rotifer was observed at <TEX>$25^{\circ}C$</TEX> in given temperature regime. Also, the SGR of females showed increasing tendencies with the increase of temperature. These results suggest that the optimum salinity and temperature for mass culture of P. similis may be 1‰ and <TEX>$25^{\circ}C$</TEX>, respectively.
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