Abstrak Size Distribution and Reproductive Biology of Gisnt Frewater Prawn (Macrobrachlum rosenbergii) in Kapuas River, West Kalimantan Province
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A research that aims to obtain data and information about distribution and reproductive biology of giant freshwater prawns in Kapuas River, West Kallmantan have been carried out from June to December 2005. Research was conducted by survey method by visiting the locations where the activities of catching prawns. Two times the frequency of surveys in the dry season and two times in the rainy season. The water qreas surveyed were the Kapuas River in Pontianak District, City of Pontianak, Districts of Sanggau and Sintang. Data were analyzed with descriptive method and tabulation. From the survey found that in the Kapuas river, a lot of prawns were caught by fishermen using nine types of fishing gear, namely : hooklines, longlines, traps, falling gear, gillnets, coast/edge traps (belat), fish agregating device (rumpon), electricalgear (Stroom) and surrounding traps (pukat rantau). The intensity of the fishing catchs appeared dominant in the downstream waters covers an area of County and City of Pontianak. The distribution of individual weight size of prawns that was caught a lotbby fishermen (mode value) of 4 times surveys varied between 17.73 to 40.00 grams (Pontianak Regency), from 19.31 to 47.01 grams (Pontianak City), 17.79-45, 35 grams (District of Sanggau) and between 25.08 to 85.52 grams ( District of Sintang). Fecundity of giant freshwater prawns varied between 7058-57887 eggs. The diameter of eggs at various of gonada maturity stages (GMS) occur in the range of 0.30 to 0.349 mm diameter in GMS-I, GMS-II, GMS-III and GMS-IV, but the diameter of the eggs in size of the middle value between 0.5745 to 0.7745 mm only exist In the broodstock of prawns with GMS·IV characterized egg gray color. Giant freshwater prawns In the Kapuas River for the first time in maturity size was 12.95 cm with a variation of value between 12.39 to 13.54 cm. Water quality at the habitat where the shrimps caught in the Kapuas River were still within feasible/reasonable limits to support the life of fish and shrimps.
Keywords : Giant freshwater prawns, Kapuas River, Distribution, Reproductive Biology