Effects Of Latency Period On Relative Fecundity, Egg Fertility, Egg Hatchability And Fry Survival Rate Of Heterobranchus Longifilis (Val. 1840)
ABSTRACT
Bloodstock of Heterobranchus longIlis
(Val. 1840) were obtained acclimatized and phypophysed with ovaprim (an
ovulating agent). Eggs were stripped from the female breeders after
hypophysation while milt obtained from the male breeders by dissection.
Proliferation and ease of flow of eggs were observed as the latency periods
increased. Lowest mean value of 32,750 eggs was obtained at the 8th h while
highest mean value of 97, 000 eggs was obtained at the 17th h of latency
period. Latency periods had a positive relationship with the relative
fecundity, (r2 0.969). In the case of the hatchability, there was no regular
pattern observed in the values. At the 1 i" h the highest peak value
obtained was 61.71% while at the l? h the value of 57% was obtained.
Hatchability had a weak relationship with latency periods (r2= 0.204). Highest
peak value of 61.94% was obtained at the 1 h and lowest value of 25% was
obtained at the 1 71ti h for fry survival rates. Latency periods and fry
survival rates were found to be adversely related (r2= 0.968). All the fry that
survived within each of the various groups were not of equal sizes.
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UYON, P (2021). Effects Of Latency Period On Relative Fecundity, Egg Fertility, Egg Hatchability And Fry Survival Rate Of Heterobranchus Longifilis (Val. 1840) . Repository.mouau.edu.ng: Retrieved Nov 21, 2024, from https://repository.mouau.edu.ng/work/view/effects-of-latency-period-on-relative-fecundity-egg-fertility-egg-hatchability-and-fry-survival-rate-of-heterobranchus-longifilis-val-1840-7-2
PETER, UYON. "Effects Of Latency Period On Relative Fecundity, Egg Fertility, Egg Hatchability And Fry Survival Rate Of Heterobranchus Longifilis (Val. 1840) " Repository.mouau.edu.ng. Repository.mouau.edu.ng, 06 Jul. 2021, https://repository.mouau.edu.ng/work/view/effects-of-latency-period-on-relative-fecundity-egg-fertility-egg-hatchability-and-fry-survival-rate-of-heterobranchus-longifilis-val-1840-7-2. Accessed 21 Nov. 2024.
PETER, UYON. "Effects Of Latency Period On Relative Fecundity, Egg Fertility, Egg Hatchability And Fry Survival Rate Of Heterobranchus Longifilis (Val. 1840) ". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 06 Jul. 2021. Web. 21 Nov. 2024. < https://repository.mouau.edu.ng/work/view/effects-of-latency-period-on-relative-fecundity-egg-fertility-egg-hatchability-and-fry-survival-rate-of-heterobranchus-longifilis-val-1840-7-2 >.
PETER, UYON. "Effects Of Latency Period On Relative Fecundity, Egg Fertility, Egg Hatchability And Fry Survival Rate Of Heterobranchus Longifilis (Val. 1840) " Repository.mouau.edu.ng (2021). Accessed 21 Nov. 2024. https://repository.mouau.edu.ng/work/view/effects-of-latency-period-on-relative-fecundity-egg-fertility-egg-hatchability-and-fry-survival-rate-of-heterobranchus-longifilis-val-1840-7-2