Watershed performance can be seen from various aspects, including the ability of the land to absorb water, the amount of erosion, water quality, and water regime index. This study is an effort to manage critical watersheds in managing water absorption based on biophysical parameters such as soil type, slope, geology, rainfall, and land cover. This research was conducted in 2021 in the Citarum watershed, limited to shallow aquifers. It is important to be mapped because it is part of 15 critical watersheds in Indonesia. The method used is to integrate RS, GIS, and Analytical Hierarchy Process (AHP). The results showed that there was a distribution of water absorption in the Citarum watershed, including very low 1.04%, low 21.33%, Medium 25.20%, high 38.80%, and very high 13.63%, with a total area of 638,511.57 ha. The dominant absorption rate is relatively high, 38.8%, and very high, 13.63%, influencing water availability in the Citarum watershed. From this study, AHP shows that the most influential in water infiltration into shallow aquifers is soil, with a score of 0.5, followed by Rainfall Criteria with a score of 0.26, followed by the land cover at 0.13, then slope and geology.
Biofloc technology is an alternative in overcoming the problem of feed waste in hard-lipped barb culture media. The decline in hard-lipped barb production was caused by limited knowledge and traditional aquaculture. This research was conducted with the aim of knowing the effect of different feeding levels on the ratio of C/N 20 on the growth of hard-lipped barb (Osteochilus hasselti). This research was conducted in May 2021-June 2022 with a trial period of May-June 2021. The design used was a Completely Randomized Design with 3 treatments (feeding rate 1%, feeding rate 3%, feeding rate 5%) and 4 replications. Parameters observed included specific length growth rate (SLGR), specific weight growth rate (SWGR), feed efficiency (FE), and survival rate (SR). Water quality parameters (DO, temperature, Ammonia, CO2, and pH) were analyzed descriptively. The results showed that the different levels of feeding with a C/N ratio of 20 had a significant effect on SLGR, SWGR, FE, and SR. SLGR in the treatment of FR 1% (0.17±0.03), FR 3% (0.28±0.03), and FR 5% (0.32±0.01). SWGR in treatment A (0.33±0.06), B(0.95±0.04), and C(1.53±0.11), FE at 1% FR treatment (16.85±1, 12%), FR 3% (25.04±0.73%), and FR 5% (30.95±1.87%). SR in the treatment of FR 1% (55.83%), FR 3% (59.16%), and FR 5% (68.33%). FR 5% treatment had the highest growth rate compared to FR 1% and FR 3% treatment. The water quality during the 40-day trial period was still within normal limits for Nilem fish cultivation in the biofloc system.
Ekosistem lamun tidak banyak dikenal luas masyarakat, padahal menyimpan banyak manfaat bagi kesejahteraan manusia, baik secara ekologi, sosial maupun ekonomi. Tujuan penelitian ini adalah melakukan analisis ekonomi keterkaitan ekosistem dan sumberdaya ikan. Penelitian dilakukan di tiga desa (Berakit, Malang Rapat dan Teluk Bakau) yang berbatasan langsung dengan Kawasan Konservasi Padang Lamun Kabupaten Bintan. Analisis ekonomi keterkaitan ekosistem lamun dan sumberdaya ikan dilakukan dengan menggunakan pendekatan koefisien daya dukung lamun. Hasil menunjukkan bahwa ekosistem lamun menyediakan layanan jasa habitat dan produksi ikan. Setiap pertambahan luas satu satuan hektar ekosistem lamun dapat meningkatkan ketersediaan sumberdaya ikan sebanyak 9049,3 kg atau setara nilai habitat sebesar Rp. 166.963.204,72 per hektar per tahun. Nilai ekonomi keterkaitan ekosistem lamun dan sumberdaya ikan mencapai sebesar Rp. 97.764.000 per hektar, artinya bahwa nilai kerugian ekonomi akibat kehilangan satu satuan hektar ekosistem lamun dalam kapasitasnya sebagai penyedia produksi ikan mencapai sebesar Rp. 97.764.000 per tahun. Kedua nilai ini diharapkan dapat menjadi pertimbangan kebijakan dalam pengukuran potensi aset sumberdaya ikan dan pengukuran potensi kerugian habitat akibat kehilangan ekosistem lamun.
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