Open AccessFeed degradation testing was carried out by feed incubation placed in nylon bags sunk in the sea for 50 days. During incubation was done the content analysis of C, N and P of feed periodicly. Waters quality determination of Ekas Bay was carried out by using STORET system. The result showed that feed decomposition rate was quickly occurred until the twenty ninth period of incubation, then continued to be slowly with the composition rate constant of k1 and k2 found to be 0.043 and 0.026, respectively. Nutrient releasing (dried weight/day) of C, N and P of feed was 0.326 C/g, 0.177 N/g and 0.073 P/g, respectively. Waters quality status of Ekas Bay was in C class (moderate fouled) with standard quality over parameters were ammoniac (0.3 mg/L), nitrate (0.008 mg/L) and phosphate (0.015 mg/L). Therefore, to anticipate the availability decreasing of habitat and its effect on culture aquatic environment is need to search efforts which can decrease waste removal rate of ammoniac, nitrate and phosphate to culture environment to minimize the effect of culture activity.