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Fajar Anggraeni and Hary Krettiawan
Research Institute for Fish Breeding
Jalan Raya 2 Sukamandi Pantura
Patokbeusi, Subang 41263
West Java, Indonesia

Indonesia is known as a center where native species of prawns, Macrobrachium rosenbergii (De Man, 1879) because there are 19 species native to Indonesia (Hadie and Hadie, 2002). But over time, early puberty or mature gonads become a problem in the cultivation of prawns. Based on the results of the evaluation of population structure on growth out of freshwater prawns of GIMacro II population in 2014 showed that there are variations in maturity in the female population suspected genetic. Efforts to improve the genetic quality through individual selection on the character of growth and the rate of female maturity expected to obtain females are late maturity or not spawn when harvesting. The aim of this study was to evaluated the first generation larvae of individual selection is based on the growth and maturity of gonads. Prawn larvae reared in six fiberglass funnel with a capacity of 60 liters with a density of 50 larvae / liter using a system of clear water salinity 10-12 ppt. Observation of larval stage of freshwater prawns done every 3 days, by taking 20 larvae / funnel maintenance to be observed with the aid of binokular microscope. Feed used is naupli Artemia sp. and artificial feed (egg custard). Parameters measured were the larval development of the first generation and control. The results showed more rapid larval development (p <0.01) in the first generation larvae compared with controls. On 22nd day, the development of the first generation larvae reach the LSI 10.55 ± 0.65, while the control larvae reached 10.02 ± 1.04. Variations larvae control on  22nd day was higher (10.47%) compared to first-generation larvae of freshwater prawns which amounted to 6.15%. Based on LSI and the coefficient of variation shows the first generation larvae have a better performance than the control larvae.

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