National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
We report induction of spontaneous spawning in Mystus cavasius in glass aquaria provided with water hyacinth for egg attachment. The brooders (20 to 25g) were injected intramuscularly with Ovatide™ at the rate of 0.2 millilitre/Kilogram body weight and introduced into the spawning tanks in the evening. Maximum spawning response was obtained when two pairs of brooders were housed in one tank. Courtship was initiated 3 hours post injection. Batch spawning over a span of 6 to7 hours occurred 7 hours post induction. The first hatchling emerged 14 hours post fertilization and yolk sac absorption was completed 48 hours post hatching at temperature of 26±2â°C. Fertilization and hatching rates of 62% and 60% respectively were obtained in spontaneous spawning as against 48.9% and 43.2% in artificial fertilization. Immediately after yolk sac absorption, the fry exhibited obligatory air breathing behaviour that lasted upto 18-20 days post hatching. Maintaining water column at 10 centimetre and stocking density at 50 to 60 numbers/litre for the first 18 days, and providing a combination of feeds improved fry survivability. Our study holds special interest in the development of field friendly seed production protocols for the species.
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