Studies on the reproductive potential of homoplastic and heteroplastic pituitary hormones in Heterobranchus bidorsalis (Geoffroy Saint Hilaire, 1809)

Abstract

Artificial induce breeding of gravid Heterobranchus bidorsalis was carried out using two hormonal materials – homoplastic and heteroplastic hormones. The study which involved 10 trials was carried out with 60 gravid female and 20 mature male. The broodfish used for the study were 18 months hatchery produced H. bidorsalis. The hormonal treatments led to the following results in terms of percentage weight loss (3.16 and 306%); fertilization rate (9522.77 ± 34813 and 8,857.93± 25557); and hatchability (9,18013± 34337 and 8,476.83 ± 34595) for homoplastic and heteroplastic hormones respectively. The mean numbers of dead eggs were 396.10± 19.15 forhomoplastic hormone injected catfish and 425.53 ± 17.09 for those injected heteroplastic hormone. Recorded deormed of larva were low (35.80 ± 1.11 and 34.27 ± 1.43) respectively for catfish injected homoplastic and heteroplastic hormones. Survival of hatchlings was high (99.61 and 9959 %) for gravid catfish inected homoplastic and heteroplastic hormones respectively. There was no significant difference (P < 005) in weight of pre and post female spawners. Although the two tested hormones investigated were effective inducers, homoplastic hormone is recommended as it recorded better results.

Keywords: Homoplastic and Heteroplastic hormones, Induced spawning, Hatchability, Heterobranchus bidorsalis