Use of freshwater hyacinth Eichhornia crassipes in cage culture in Lake Rawa Pening, Central Java
1986
Hutarabat, J. | Syarani, L. | Smith, M.A.K. (Diponegoro Univ., Semarang, Central Java (Indonesia). Jurusan Perikanan, Fakultas Peternakan)
Rawa Pening is extensively utilized as a hydroelectric, irrigation, fishing and recreational resource. A major constraint to be efficient resource management is the extensive (60%) cover of water hyacinth on this lake. The use of water hyacinth as a feed for cage cultured fish was investigated as a possible solution to this problem. Java carps, Puntus javanicus; common carp, Cyprinus carpio; tilapia, Oreochromis mossambicus; and Sepat Rawa, Trichogaster sp., kept in cages suspended in the lake were fed four diets including: 2.5% composted water hyacinth; 10% composted water hyacinth 2.5 percent noncomposted water hyacinth; and 10% non-composted water hyacinth. All diets were kept at a 25% protein level and contained the same carbohydrate and fat constituents. Feeding frequency was twice a day at 5% body weight per day. Stocking density was 45/m3 with an initial stocking weight of 10-20 g. Results showed that in P. javanicus, C. carpio and O. mossambicus substitution of up to 10% by weight of either composted or non-composted water hyacinth in the diets did not significantly decrease the growth rates. Trichogaster sp. showed a significantly decreased growth rate at the higher levels of substitution.
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