Water quality at silvoaquaculture pond in indramayu regency

Abstract

Silvoaquaculture is one of environmentally friendly aquaculture, which is integration between fish ponds (brackish water aquaculture) and mangrove tree in the coastal area. In Indramayu Regency, silvo-aquacultures are located in Karangsong, Brondong and Tegur village. Milk fish (Chanos chanos) was cultured at silvo-aquaculture in Indramayu Regency. The objective of this study is to know water quality at silvo-aquaculture ponds in Indramayu Regency. The water quality has been measured includes temperature, salinity, pH, brightness, DO, nitrate, phosphate, and ammonia. The ranges of water quality values at silvo-aquaculture ponds in Indramayu Regency are Brondong Village {temperature (29.8-33.0 C), salinity (26-30 ppt), pH (7.27-7.80), brightness (26.5-91 cm), DO (3.1-10.7 mgL-1), nitrates (12.5 mgL-1), phosphates (0.03 mgL-1), and ammonia (0.25 mgL-1)}; Karangsong Village {temperature (29.5-31.0 C), salinity (17-25 ppt), pH (7.29-7.51), brightness (39.5-47 cm), DO (2.2-4.4 mgL-1), nitrates (12.5 mgL-1), phosphates (0.03 mgL-1), and ammonia (0.25 mgL-1)}; and Tegur Village {temperature (30.4-31.8 C), salinity (15-19 ppt), pH (7.14-8.18), brightness (32.25-48.25 cm), DO (8.8-9.5 mgL-1), nitrates (12.5 mgL-1), phosphates (0.03 mgL-1), and ammonia (0.25 mgL-1)}. Analysis of variance showed temperature, pH, brightness, phosphate, nitrate, and ammonia were not significantly different between locations, but salinity and DO were significantly different between locations. These results indicate all water-quality parameters are suitable for fish culture. The lower salinity presented in Tegur Village was affected by rainy. Interestingly, DO concentrations in the Karangsong silvo-aquaculture pond are lower than optimal value (<5.00 mg/l), but they are still suitable for milkfish life (> 2 mg/l).