This study was carried out to measure the optimum growth of Heterobranchus bidorsalis and the best time to crop under maximum utilization of. Biology. Hardly anything is known about the biology of this species (Ref. ). Maximum reported size for West Africa: mm TL (Ref. ). Trusted. Information about the classification of Heterobranchus bidorsalis. Includes facts, pictures and articles.
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Mean specific instantaneous growth rates SGR estimated as percentage increase in weight per growth period of Heterobranchus bidorsalis was calculated at the end of each growth period using the formula:.
Equation 1 was linearized by logarithmic transformation to enable the estimation of the values of constants a and b using least square linear regression Zar, Olarewaju bisorsalis Dada also reported that the hybrid H.
Result demonstrated the potential of Heterobranchus bidorsalis for use in aquaculture. Handbook for Common Calculations in Finfish Aquaculture. Some simple methods for the assessment package of tropical fish stocks. There preference as cultured species is due to several factors. They examined length-weight relationships of nine fish bidprsalis from Ologe Lagoon, Lagos, Nigeria. Please see our brief essay.
Retrieved from ” https: The last set of two bowls contained eggs from female H. Studies on growth performance and feed utilization of two Clariid catfish and their hybrid reared under different culture systems.
Survival rate, specific growth rate and condition factor of fish species were also determined. Abu Bakar and Z. Specific growth rate SGR and condition factor K: It has made possible the supply of varieties of seeds of different fish species.
Therefore, ovaprim and male pituitary extract are recommended for commercial aquaculture practice. The highest values for weight gain 5.
Short description Morphology Morphometrics Dorsal spines total: The coefficient of determination r 2 for length-weight relationships was strong 0. Final length-weight relationship, correlation coefficient and condition factor of study fish.
Three female Heterobranchus bidorsalisthree male Heterobranchus bidorsalis and three male Clarias gariepenus 0.
The feeding rate was recalculated every fortnight to bidrsalis weight changes that would have occurred. The numbers of fertilized and unfertilized eggs were counted under a microscope Adebayo, Then six males 3 H. Rearing conditions were similar to the ones used in the reproductive performance phase of the experiment.
Heterobranchus bidorsalis – Wikipedia
March 15, ; Accepted: Induced spawning of the striped murrel Channa striatus using pituitary extracts, human chorionic gonadotropin, luteinizing hormone releasing hormone analogue and ovaprim r. Studies into artificial spawning in this species showed that spawning can be induced in females by single intramuscular hormone injections of hetdrobranchus pituitary suspensions.
Coefficient of determination, k: Heterobranhcus eggs and net were siphoned after hatching to prevent fouling of the water. Hatchery raised gravid broodstocks were selected from Lagos State University hatchery.
Water quality parameters of the culturing medium of pure breed and hybrid of Heterobranchus bidorsalis. At two weeks interval, the fish were sampled with a 2. The feed for each day was divided into two parts and administered at and h for a period of 56 days. Three hormones were used in this study; one synthetic and two natural hormones.
Modified by Musschoot, Tobias. Nutrient utilization parameters Feed Intake FI: Views Read Edit View history.
Heterobranchus bidorsalis, African catfish : fisheries
World aquaculture supply of catfish and tilapia. Feeding was done twice daily; morning 9: Effect of mixed feeding schedules with varying dietary crude protein levels on the growth and feed utilization of Clarias gariepinus Burchell, fingerlings. Retrieved 14 January Intensification of aquaculture practices in Nigeria has been identified as one of the tools that can help in closing the gap between demand and supply of fish and fisheries products Owodeinde and Ndimele, Mean condition factor K was 1.