This research aims to know the influence of the thickness of catfish culture waste on silk worm (Tubifex sp.) biomass. The research was conducted with culturing Tubifex sp. in different thickness media of the waste as treatments. The treatments consist of the waste 2, 4, 8 and 12 cm thickness of medium with 6 cm depth. The stock densities 150 g/m3 with average weight 0.0062+0.00032 g. The parameter that analyzed is biomass and population of Tubifex sp.. Data analyzed by analysis of variance and posthoc test is Duncan’s Multiple Range Test. The result shows that diversification of medium thickness gives the real influence (P<0.05) to Tubifex sp. biomass. The highest biomass 1745.14±143.77 g/m3 and population 233,848.46±19265.61 ind./m3 on the treatment with 8 cm thickness. The relationship between treatment and biomass production of Tubifex sp. is quadratic relationship with y = -30.405x2 + 552.18x – 823.55. The optimum thickness of medium that results maximum biomass production is 9.1 cm.
Brackish water vannamei shrimp aquaculture in Keburuhan village of Purworejo Regency is one of the shrimp aquaculture activities developed since 2010. Shrimp aquaculture enteprises were done by local communities which use sandy land coated by plastic sheet with an area of 1000-4500 m 2. Some farmers suffered losses due to lack of technical knowledge in shrimp aquaculture, environmental carrying capacity, ecological and economic feasibility. The aim of this study was to determine the general condition of vannamei shrimp aquaculture and shrimp farming feasibility. The study was conducted by field surveys, interviews and questionnaires to 30 farmers. The survey was conducted in May-June 2016 by purposive sampling of farmers who were members of a joint venture group of Minamulyo. The results showed shrimp pond size aquaculture area was varied, with a range of 1000-1500 m 2 , 1500-2000 m 2 , 2000-3000 m 2 and 3000-4500 m 2. An average fixed cost required for construction and operation of shrimp pond aquaculture was approximately IDR 6,620,934 to 12,606,666 million/plot/cycle shrimp production, while the variable costs of each cycle production ranged from IDR 45,876,733 to 78,861,666. The revenue and net profit varied according to pond size. The net gain for the smallest pond (1000-1500 m 2) was IDR 48,702,332/plot/cycle, and the largest pond (3000-4500 m 2) was IDR 58,131,666/plot/cycle. The shrimp farmers could recover the original investment incurred within a period of 4-6 months (one half cycles). Vannamei shrimp aquaculture in Keburuhan village of Purworejo regency brings a variety positive and negative impacts to the development of the economic, social and environment. Positive impact included increase of income and welfare of farmers, while the negative impact was a decline in the quality of the pond environment.
Penelitian ini bertujuan untuk mengevaluasi kandungan nutrien dan antinutrien tepung daun kelor terfermentasi sebagai sumber protein nabati pakan ikan. Tahap penelitian meliputi pembuatan tepung daun kelor, persiapan dan penghitungan kepadatan bakteri, proses fermentasi, dan analisis kandungan nutrien dan antinutriennya. Bakteri yang digunakan untuk fermentasi merupakan campuran bakteri T2A (Bacillus sp.), T3P1 (Bacillus sp.) dan JAL11 (Lactococcus raffinolactis) dengan kepadatan sebesar 2,16x109 cfu/mL. Fermentasi tepung daun kelor dilakukan selama 168 jam. Analisis kandungan nutrien dan zat antinutrien tepung daun kelor terfermentasi dilakukan pada jam ke-24, ke-48, ke-72, ke-96, ke-120, ke-144 dan ke-168. Kandungan nutrien tepung daun kelor meliputi kadar air (9,04±0,00%), abu (9,70±0,21%), protein (25,77±0,08%), lemak (4,80±0,52%), serat kasar (11,60±0,13%), bahan ekstrak tanpa nitrogen (39,06±0,52%), energi (351,27±3,27 kkal/00 g), hemiselulosa (13,79±0,07%), selulosa (9,9±0,06%) dan lignin (15,34±0,31%). Fermentasi dapat meningkatkan kadar air, abu, protein dan lemak, serta menurunkan kadar serat kasar, bahan ekstrak tanpa nitrogen, hemiselulosa, selulosa, lignin dan antinutrien, antara lain fenol, tanin, asam fitat dan HCN. Hasil penelitian menunjukkan bahwa fermentasi dapat meningkatkan kandungan nutrien dan menurunkan kandungan antinutrien tepung daun kelor, sehingga dapat digunakan sebagai sumber protein nabati pada bahan baku pakan ikan.
AbstrakKajian mengenai analisis kandungan nitrogen (N), fosfor (P) dan karbon organik (KO) telah dilakukan di Danau Sentani, Papua. Penelitian ini bertujuan untuk mempelajari kandungan ketiga unsur tersebut di perairan. Metode penelitian yang digunakan adalah metode survei berstrata (stratified sampling method) sesuai dengan tujuan (purposive). Abstract Study on the analysis of nitrogen (N), phosphorus (P) and organic carbon (OC) content has been conducted at
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