Induced Ovulation of the Australian Eel-tailed Catfish Neosilurus ater (Perugia) with Ovaprim
2000
M.S.H. CHEAH | C.L. LEE
The effect of Ovaprim on induced ovulation of eel-tailed catfish, Neosilurus ater, was studied. Twenty gravid females with a body weight of 582±25 g were randomly assigned to five treatment groups. Females were treated with either saline (control), 0.25, 0.50, 0.75, or 1.00 mL·kg-1 body weight (BW) of Ovaprim. The oocyte diameters prior to hormone administration ranged from 1.91-2.01 mm and the oocyte diameters for all experimental fish were similar (P>0.05). No ovulatory response was observed when the fish were treated with either 0 or 0.25 mL·kg-1 body weight (BW) of Ovaprim. However, all of the fish that were treated with 0.50, 0.75 or 1.00 mL·kg-1 body weight (BW) of Ovaprim ovulated. The latency periods and the working fecundities per 100 g BW ranged from 20-23 hours at 28 °C and from 2,877-3,001 eggs, respectively, and the values for the three treatments were similar (P>0.05). The fertilization rates and the hatching rates ranged from 77.5-89.9% and 75.6-82.0%, respectively. All the rates for the three successful treatments were not significantly different (P>0.05).
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