Abstract
Gourami is one of the main freshwater fish commodities which has a high economic value. One of the efforts that can be made to increase the productivity of gourami is the provision of macromineral in the form of calcium carbonate (CaCo3). This study aimed to determine the effect of calcium on productivity that would be seen through the growth rate and feed conversion ratio of gourami seed. The study consisted of five doses of calcium carbonate, each of which was repeated three times. As for treating the doses of calcium carbonate, including 1 (0 mg / L CaCO3), 2 (150 mg / L CaCO3), 3 (200 mg / L CaCO3), 4 (250 mg / L) CaCO3) and 5 (300 mg / L CaCO3). The maintenance medium is added with a salinity of 3 ppt in order to save metabolic energy through an osmoregulation mechanism so that the available energy is expected to be used to increase growth. The result or absolute weight growth was not significantly different based on the analysis of variance and linier regression analysis. The analysis of variance showed that no significant different for survival rate of all treatments. The value of feedÃÂ conversion ratio was not significantly different based on analysis of variance and linier regression analysis. Addition of calcium carbonate did not give significant difference in the absolute weight growth, survival rate, and feed conversion ratio of gourami seed.
Highlights
Gourami (Osphronemus gourami) is a fish with high economic value which is one of the main commodities of aquaculture in Indonesia
Absolute Weight Growth The data of absolute weight growth was presented in figure 1
The regression analysis showed that the result of R2 on concentration of calcium and absolute growth 0.15
Summary
Gourami (Osphronemus gourami) is a fish with high economic value which is one of the main commodities of aquaculture in Indonesia. To reach a size of 200 g / head from a size of 15 g / head it takes 120 days, in the first stage of enlargement with a protein content of 2026% while in the second stage of enlargement from a size of 200 g / head to reach a consumption size of 500 g / head takes 150 days (SNI 2006). This is an obstacle faced by cultivators in order to increase the productivity of gourami. In order for fish organ cells to function properly, these cells must be in a fluid media (extracellular) which has the same ionic composition and concentration as the fluid in cells (intracellular) (Fujaya, 1999)
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