i s h e r ie s & Wldl Poultry, Fisheries & ifec Suantika et al., Poult .
Java, Indonesia, and further cut into 2 × 2 cm cubical limestone using a grinding wheel. Available surface area to volume ratio in limestone substrate and bioball substrate was 2 cm2 cm-3 and 3 cm2 cm-3, respectively. Due to instrument limitation, microporous