Effect of calcium carbonate on growth and reproductive performance of moina macrocopa

Abstract

This study aims to investigate the effect of calcium carbonate on life table demography of Moina macrocopa. Brooders of Mmacrocopa was exposed to different concentrations of calcium carbonate, CaC03 (40 mg/L CaC03, 80 mg/ L CaC03, 200 mg/ L CaC03, and 500 mg/ L CaC03) under optimal condition. Results show that life span of M macrocopa increased as the concentration of calcium carbonate increased in the range O mg/ L to 200 mg/ L and if exceed 200 mg/ L the result is reversed. As the concentration increase, the cumulative birth increased during the early reproductive period. 100% of mortality occurs on day 16 for concentration 0, 40, 80, and 200 mg/ L. For higher concentration 500 mg/L, mortality starts on the second day and total mortality was observed at day 11. Different concentration of CaC03 gives effect to the size of neonates produced by M macrocopa. The size for neonates produced range from 0.523 mm (at O mg/ L) to 0.474mm (at 200 mg/ L ). This result suggests that higher concentration will cause Jong life span of M macrocopa as Jong as the concentration is not exceed the range 0-200 mg/ L.