TOXICITY OF THE HERBICIDE GLYPHOSATE (ROUND-UP) ON FINGERLINGS OF HETEROCLARIAS (HYBRID)

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dc.contributor.authorMICAH, ADEKUNLE DAVID
dc.date.accessioned2016-01-21T08:10:00Z
dc.date.available2016-01-21T08:10:00Z
dc.date.issued2015-05
dc.descriptionA THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY, ZARIA, IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE AWARD OF DEGREE OF MASTER OF SCIENCES IN FISHERIES DEPARTMENT OF BIOLOGICAL SCIENCES, FACULTY OF SCIENCE, AHMADU BELLO UNIVERSITY, ZARIA NIGERIAen_US
dc.description.abstractThe toxicity effect of glyphosate on fingerlings of Heteroclarias after series of range finding tests, the fishes were exposed to lethal concentration of 0.00mg/l, 5.40mg/l, 7.20mg/l, 9.00mg/l, 10.80mg/l and 12.60mg/l for 96 hours as well as sub-lethal concentrations of 0.00mg/l, 0.30mg/l, 0.70mg/l and 1.40mg/l of glyphosate for 8 weeks in a renewal bioassay procedure showed that the 96 hours LC50 was 6.838mg/l with upper and lower limits of toxicities were 8.237 and 5.674mg/l respectively. Respiratory disturbance, erratic swimming, loss of equilibrium, lethargies and sudden fish death were observed in the exposed fish and these varied greatly with differences in concentration of the toxicant and this shows that mortality increases with an increase in concentration. Also, as the concentration of glyphosate increased the beats of the tail and operculum increased in 12 and 24 hours. The differences observed in the mortalities of Heteroclarias at varying concentrations were significant (p<0.05), an indication that mortality could be a factor of concentration and time of exposure. The physico-chemical parameters obtained before and after the experiment were within the tolerated limit. Also the toxicant led to significant changes (p<0.05) in haematological parameters as the toxicant concentration increased. Mean Red Blood Cells (RBC), Haemoglobin content (Hb), Packed Cell Volume (PCV), reduced as the concentration of toxicant increased while other parameters increased proportional with the toxicant concentration. The changes in gills were characterized by mononuclear infiltration, inflammation of primary and secondary lamella, cellular infiltration, vacuolation. The liver showed vascular congestion, kupffer cell hyperplasia, necrosis, adipocyte infiltration, lymphocyte hyperplasia in the liver of fish treated with 5.40mg/l, 9.00mg/l, 10.80mg/l, 12.60mg/l vii concentrations of glyphosate. Significant alteration in oxidative stress parameters in the treated fish were dose dependent. The growth rates were significantly reduced in fish exposed to sub-lethal concentration of the herbicide. Glyphosate showed high significant (p<0.05) inhibition in all nutrient utilization parameters i.e specific growth rate, feed conversion rate, gross feed conversion efficiency, feed efficiency, live weight gain and nutrient metabolism (SGR, FCR, GFCE, FE, LWG and NM).en_US
dc.identifier.urihttp://hdl.handle.net/123456789/7321
dc.language.isoenen_US
dc.subjectTOXICITY,en_US
dc.subjectHERBICIDE,en_US
dc.subjectGLYPHOSATE,en_US
dc.subject(ROUND-UP),en_US
dc.subjectFINGERLINGS,en_US
dc.subjectHETEROCLARIAS,en_US
dc.subject(HYBRID).en_US
dc.titleTOXICITY OF THE HERBICIDE GLYPHOSATE (ROUND-UP) ON FINGERLINGS OF HETEROCLARIAS (HYBRID)en_US
dc.typeThesisen_US
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