Survival Of Yolk Sac Larvae And Gonad Development Of Oreochromis Niloticus In Serially Diluted Solutions Of Layer (Chicken) Manure
ABSTRACT
Survival
of yolk-sac larvae and gonad development of Oreochromis
niloticus in serially diluted solutions of layer (chicken) manure were
evaluated. The experiment was a complete randomised design with five treatments
and three replicates. Levels of layer manure concentrations were introduced to
70 litre containers at the concentration of 8.4mg/l, 19.6mg/l, 28mg/l, 42mg/l
and 84mg/l and the control devoid of any toxicant. The acute toxicity lasted
for 4 days (96hrs LC50). The survival larvae were reared for three
months with the larvae being fed twice a day to satiation at a stocking density
of 10 fish per treatment. From the toxicity result the median lethal
concentration (LC50) value of layer (chicken) manure for O. niloticus larvae was 30.90mg/l and
the threshold is 1.49mg/l. The pH and temperature varied from control (p<0.05) while the dissolved oxygen
decreased as the concentration increased. At the end of the rearing period,
fish were dissected and gonad obtained for histological analysis. From the
result, it could be attributed histologically that layer manure reduced the maturity
of the gonads. The highest concentration (84mg/l) had more immature ovaries
with mean value of 98.21±0.50, while
control had the least (30.89±1.38). Maturing
ovaries were highest in the control with mean value of 69.11±1.39 as compared to 84mg/l concentrations
(1.75±0.52). There was
significant difference between the means of dissolved oxygen, pH and
temperatures (p<0.05).
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MBANEFO, M (2022). Survival Of Yolk Sac Larvae And Gonad Development Of Oreochromis Niloticus In Serially Diluted Solutions Of Layer (Chicken) Manure. Repository.mouau.edu.ng: Retrieved Nov 21, 2024, from https://repository.mouau.edu.ng/work/view/survival-of-yolk-sac-larvae-and-gonad-development-of-oreochromis-niloticus-in-serially-diluted-solutions-of-layer-chicken-manure-7-2
MBANEFO, MBANEFO. "Survival Of Yolk Sac Larvae And Gonad Development Of Oreochromis Niloticus In Serially Diluted Solutions Of Layer (Chicken) Manure" Repository.mouau.edu.ng. Repository.mouau.edu.ng, 19 Oct. 2022, https://repository.mouau.edu.ng/work/view/survival-of-yolk-sac-larvae-and-gonad-development-of-oreochromis-niloticus-in-serially-diluted-solutions-of-layer-chicken-manure-7-2. Accessed 21 Nov. 2024.
MBANEFO, MBANEFO. "Survival Of Yolk Sac Larvae And Gonad Development Of Oreochromis Niloticus In Serially Diluted Solutions Of Layer (Chicken) Manure". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 19 Oct. 2022. Web. 21 Nov. 2024. < https://repository.mouau.edu.ng/work/view/survival-of-yolk-sac-larvae-and-gonad-development-of-oreochromis-niloticus-in-serially-diluted-solutions-of-layer-chicken-manure-7-2 >.
MBANEFO, MBANEFO. "Survival Of Yolk Sac Larvae And Gonad Development Of Oreochromis Niloticus In Serially Diluted Solutions Of Layer (Chicken) Manure" Repository.mouau.edu.ng (2022). Accessed 21 Nov. 2024. https://repository.mouau.edu.ng/work/view/survival-of-yolk-sac-larvae-and-gonad-development-of-oreochromis-niloticus-in-serially-diluted-solutions-of-layer-chicken-manure-7-2