Heterobranchus Bidorsalis Research Papers - Academia.edu (original) (raw)

Background and Objective: Sustainability of the consistent expansion of aquacultural industry depends on development of fish culture techniques in order to obtain the most efficient, safe and cost effective methods for producing aqua... more

Background and Objective: Sustainability of the consistent expansion of aquacultural industry depends on development of fish culture techniques in order to obtain the most efficient, safe and cost effective methods for producing aqua products. The study evaluated the Heterobranchus bidorsalis fed varying levels of flamboyant (Delonix regia) growth performance and feed utilization of African catfish seed meal as replacement for wheat offal for 14 weeks. Materials and Methods: The experiment was conducted for 14 weeks (98 days) from May 6th to August 12th, 2017. Four experimental feeds (Diets 1, 2, 3 and 4) each with about 40% crude protein content were Delonix regia seed meal formulated at diet 1 = 0%, diet 2 = 15%, diet 3 = 20% and diet 4 = 25% inclusion levels of fermented and boiled (FSM). Post 2 weeks of acclimation, 15 fish were stocked in a happa pen sized 0.432 m for each feed with 3 replicates. The initial mean weight of fish was (33.70±0.78 g). Fish were fed at 3% body weight daily and adjusted accordingly every fortnight. Water quality parameters were noted morning and evening weekly. Results: Survival rate ranged from 79.99-86.66% randomly without significant difference. Treatments which contained 15% FSM gave the highest nominal performance with respect to mean weight gain, percentage mean weight gain, mean growth rate, specific growth rate and performance index, though there was no clear superiority over other feeds (p>0.05). The feed utilization indices were generally fair across all treatments, with best nominal performance in the treatment containing 25% FSM. Conclusion: The results revealed that the fish were able to utilize all the feed types well for growth, particularly at 15% inclusion level of flamboyant seed meal as basal feed stuff.
Key words: Growth performance, feed utilization, Heterobranchus bidorsalis, Delonix regia

Induced spawning of African giant catfish (Heterobranchus bidorsalis) was successfully carried out using synthetic hormone (Ovaprim) and natural hormone (homoplastic hormone-pituitary extract from H. bidorsalis). The study which was... more

Induced spawning of African giant catfish (Heterobranchus bidorsalis) was successfully carried out using synthetic hormone (Ovaprim) and natural hormone (homoplastic hormone-pituitary extract from H. bidorsalis). The study which was carried out at Aquafish Farm, Ihiala, Anambra State, Nigeria, lasted 70 days (May to July). Sixty gravid females and twenty mature males of H. bidorsalis (weight range of 310 to 550 g) were used for the study. In all, 10 trials were carried out with a control. The results showed that ovaprim performed significantly better (P < 0.01) in almost all the parameters investigated. The two hormonal materials gave slightly different results in terms of pre and post hormonal induced spawning mean somatic weight loss of 423.83 ± 14.19 g and 446.00 ± 13.37 g, mean number of dead eggs of 396.10 ± 19.15 and 194.90 ± 11.00, hatchability of 9,180.13 ± 343.37 and 11,162.27 ± 362.00 hatched larvae, 35.80 ± 1.11 and 12.37 ± 1.54 deformed larvae, and 99.61 and 99.88% survival were recorded respectively for homoplastic hormone and ovaprim, respectively. Comparative cost benefit analysis showed that ovaprim which recorded better results, was also relatively cheaper. Ovaprim worth N3467.00 was used for induced breeding of H. bidorsalis with combined body weight of 13.38 kg while pituitary hormone was extracted from N 6350.00 worth of H. bidorsalis and used for
induced breeding of gravid H. bidorsalis with combined body weight of 12.72 kg. Because of its relatively cheap cost, ease of handling and better survival of hatchlings from H. bidorsalis, ovaprim is highly recommended for hatchery users.

Induced spawning of African giant catfish (Heterobranchus bidorsalis) was successfully carried out using synthetic hormone (Ovaprim) and natural hormone (homoplastic hormone-pituitary extract from H. bidorsalis). The study which was... more

Induced spawning of African giant catfish (Heterobranchus bidorsalis) was successfully carried out using synthetic hormone (Ovaprim) and natural hormone (homoplastic hormone-pituitary extract from H. bidorsalis). The study which was carried out at Aquafish Farm, Ihiala, Anambra State, Nigeria, lasted 70 days (May to July). Sixty gravid females and twenty mature males of H. bidorsalis (weight range of 310 to 550 g) were used for the study. In all, 10 trials were carried out with a control. The results showed that ovaprim performed significantly better (P < 0.01) in almost all the parameters investigated. The two hormonal materials gave slightly different results in terms of pre and post hormonal induced spawning mean somatic weight loss of 423.83 ± 14.19 g and 446.00 ± 13.37 g, mean number of dead eggs of 396.10 ± 19.15 and 194.90 ± 11.00, hatchability of 9,180.13 ± 343.37 and 11,162.27 ± 362.00 hatched larvae, 35.80 ± 1.11 and 12.37 ± 1.54 deformed larvae, and 99.61 and 99.88% survival were recorded respectively for homoplastic hormone and ovaprim, respectively. Comparative cost benefit analysis showed that ovaprim which recorded better results, was also relatively cheaper. Ovaprim worth N3467.00 was used for induced breeding of H. bidorsalis with combined body weight
of 13.38 kg while pituitary hormone was extracted from N 6350.00 worth of H. bidorsalis and used for induced breeding of gravid H. bidorsalis with combined body weight of 12.72 kg. Because of its
relatively cheap cost, ease of handling and better survival of hatchlings from H. bidorsalis, ovaprim is highly recommended for hatchery users.

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... more

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.