A COMPARATIVE STUDY ON THE BREEDING PERFORMANCE OF BIDORSALIS HETEROBRANCHUS AND HETEROBRANCHUS LONGIFILIS, USING THREE DOSES OF OVAPRIM

Abstract

Comparative analysis was carried out on induced breeding of Heterobranchus bidorsalis and Heterobranchus longifilis, using ovaprim at three doses, viz 4ml/Kg, 5ml/Kg and 6ml/Kg of female broodfish weight. Latency period and time of hatching were similar for both fish species. The dosage of 4mg/Kg gave 2.66% fertilization among H.bidorsalis eggs and no fertilization among H. longifilis eggs. No hatching occurred at this hormone dosage with 5mg/Kg of hormone of dosage, mean fertilization and hatching values were 49.17±5.73 and 38.75 ±5.10 respectively for H. bidorsalis and 37.42±7.00 and 26.08 ± 3.82 respectively for H. longifilis. However, the dosage of 6mg/ kg gave the best results of 65.58±4.54 and 59.75±4.41 for fertilization and hatching rates respectively in H. bidorsalis. In H. longifilis, the same dosage gave fertilization and hatching rates of 51.75±4.47 and 47.16±4.73 respectively. Mean water temperature in the broodstock ponds was 28.42oC ± 1.55, dissolved oxygen was 1.64mg/L±0.56 during the study period. Students t-test should no significant difference (P>0.03) in survival of fry of fish species after 10 days of rearing in concrete tanks.