Growth response of four species of carps to different protein sources in pelleted feeds.
1986
Nandeesha M.C. | Devaraj K.V. | Sudhakara N.S.
Experiments were conducted in duplicate in earthern ponds of 200 sq.m. each for a period of 112 days. Four species of major carps -- catla, rohu, common carp and silver carp were stocked at 7,000/ha in the ratio of 0.5:1:1:1, respectively. Three feeds -- silkworm fecal matter based diet (pellet SF), slaugther house waste based diet (pellet SH) and fishmeal based diet (pellet FM) were fed at 5% of the body weight of the fish for the first 28 days and later at 2.5% of the body weight. All the three feeds were formulated in such a way that the protein content of each feed was around 30%. The growth of catla was found to be superior on pellet SH, followed by pellet FM and pellet SF. The growth of rohu was found to be superior on pellet SF, while it was almost equal on pellets SH and FM. Silver carp responded better to pellet SH than the pellets SF and FM. Common carp was found to grow better on pellet SH than on pellets SF and FM. Net estimated fish production obained from pellet SH was 2,097.8 kg/ha/year as against the production from pellet SF (1,684.18 kg/ha/year) and pellet FM (1,148.40 kg/ha/year). Conversion ratio was found to be the best (1.67) with pellet SH, followed by 1.93 for pellet FM and 2.03 for pellet SF. The cost of production of fish was maximum with pellet FM (Rs 3.70/kg) as compared to pellet SH (Rs 2.52/kg) and pellet SF (Rs 1.97/kg). This study indicates that it is possible to successfully replace fishmeal with cheaper slaughter house waste or silkworm fecal matter.
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