Induced Spawning of Puntius gonionotus (Bleeker)

Abstract

An experiment was conducted to study the induced spawning of Rajputi Puntius gonionotus (Bleeker) in the months of April, May, June and July 2005. Five different doses of PG were used in the experiment. In Puntius gonionotus all the different doses (doses D1-3.00 mg/kg, D2-6.00 mg/kg, D3-9.00 mg/kg, D4- 12.00 mg/kg and D5-15.00 mg/kg) were affected equally (100%) in egg release. In the experiment both the males and females were given the 1st dose but the 2nd injection was given only to the females after 6 hours. The highest fertilization rates were 70.10±2.25% in April (dose D4), 75.00±2.10% in May (dose D3), 80.00±2.14% in June and 79.20±2.65% in July (dose D3). The highest hatching and survivability rates were 61.50±3.10 and 55.00±2.13 in April (dose D4), 68.00±3.5 and 63.00±2.20 in May (dose D3), 71.80±2.00 and 68.50±2.60 in June (dose D2), and 70.25±3.50 and 65.70±2.16 in July (dose D3) respectively. The month of June and the dose D2 (2mg in first injection and 4 mg in second injection) were found to be most effective for induced spawning of P. gonionotus. Key words: Induced spawning, hatchling, PG dose. J. bio-sci. 14: 121-125, 2006