Induced Spawning of <i>Puntius gonionotus</i> (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