Publication Date:
2021-07-15
Description:
Sarotherodon melanotheron fry were reared in six (6) tanks for three (3) months, of which three (3) tanks served as treatment tanks while the other three(3) served as the controle. The fry were fed with 17a-methyl testosterone enzyme, which functions as a sex reversal hormone. The fry were administered this hormone for 30 days, to ensure complete sex reversal. All the S.melanotheron fry were reared to table size for duration of three (3) months, after which the blood samples were taken for both the controle and treatment fishes. It was observed that the sex reversal of S. melanotheron were also captured from the Lagos Lagoon, and their blood samples were also taken and analysed. The result shows that the blood parameters except white blood cell count (WBC), were highest in sex reversed tilapia Red Blood Cell count (RBC), 0.67 x 109, Haemoglobin concentration (HgB), 2.7g/dl, Mean corpuscular value (MCV), 14.7fL\} and lowest in the wild specimens (RBC, 0.14 x 109 HGB, 1.7g/dL, MCV, 10.2fL). WBC was highest however, in the wild specimen with value of 2.0 x 106. The WBC, RBC, HGB, and MCV values for the control specimen were 1.0 x 106/L, 0.33 x 109/L, 2.1 g/dL and 14.7fL. A total protein value for sex reversed specimens was 390nm/mg protein/min, 217nm/mg protein/min and 243nm/mg protein respectively. In this study, the result showed that sex reversal in tilapia culture is not harmful to the metabolism of the fishes, and in fact, results in larger healthier fishes, than those caught from the heavily polluted waters of the Lagos lagoon. Growth and nutrient utilization analysis measurements weekly for the sex reversed and control fish specimen. At the end of the duration of the experiment, the sex-reversed fishes growth rate (SGR) of 17.59, and the control specimen had a SGR value of 10.31. The results highlighted the suitability of culture systems for the rearing of S. melanotheron.
Description:
Includes: 22 references.
Keywords:
Aquaculture
;
Sarotherodon melanotheron
;
Nigeria
;
Sand dredging
;
Ikpa River
;
Plankton
;
Water quality
;
freshwater environment
;
automation
Repository Name:
AquaDocs
Type:
conference_item
,
TRUE
Format:
application/pdf
Format:
application/pdf
Format:
267-272
Permalink
