Effects of salinity, temperature, light intensity and light regimes on production, growth and reproductive parameters of Apocyclops dengizicus

The effects of salinity, temperature, and light conditions on production and development, longevity, survival and sex ratios of the cyclopoid copepod, A. dengizicus were determined. Seven different salinity levels (۵, ۱۰, ۱۵, ۲۰, ۲۵, ۳۰, ۳۵ psu), four temperatures (۲۰, ۲۵, ۳۰, ۳۵ °C), three different light intensities (۳۳.۳, ۸۵.۳, ۱۶۲.۱ μmol photons/ m۲/ s) and light regimes (۲۴:۰, ۰:۲۴, and ۱۲:۱۲ h light:dark regime) were employed . The highest production was achieved under ۲۰ psu salinity. The optimum temperature required for the maximum reproduction and shortest development time was ۳۵ °C. The production was highest (p<.۰۵) and development rate of A. dengizicus was shortest (p<.۰۵) under the lowest light intensity (۳۳.۳ μmol photons/ m۲/ s). Continuous light (۲۴:۰ h LD) showed positive effects on growth and production. Light regimes ۲۴:۰ h and ۱۲:۱۲ h LD yielded the highest total production and growth (p<.۰۵), with highest (p<.۰۵) survival percentage. This study demonstrated that A. dengizicus can tolerate wide range of environmental conditions and can be cultured for commercial live feed purposes as well as toxicity studies.

Keywords:

Environmental parameters , A. dengizicus , Cyclopoid copepod , Tropical , Production , Longevity , Sex ratio