TOXIC EFFECTS OF SUBLETHAL CONCENTRATIONS OF LEAD ON Tilapia nilotica(Linnaeus

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dc.contributor.authorRUFUS, OLOGUNMETA TAYO
dc.date.accessioned2015-03-17T08:22:25Z
dc.date.available2015-03-17T08:22:25Z
dc.date.issued1985-10
dc.descriptionA THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN EDUCATIONAL - BIOLOGY. DEPARTMENT OF BIOLOGICAL SCIENCES, FACULTY OF SCIENCE AHMADU BELLO UNIVERSITY ZARIA OCTOBER 1985en_US
dc.description.abstractToxic effects of sublethal concentrations of lead was observed on fingerling Tilapia nilotica(L) of size range 12-14.5cm total length, caught from Maska and Maigana fish farms, located at kilometer I4.5 and 25 along Zaria - Funtua and Zaria - Jos roads in Kaduna State of Nigeria respectively. Effects of lead on the growth, haemoglobin, haematocrit, blood serum protein, red cell morphology, liver and skeletal muscle glycogen and liver histology were observed in fish exposed to lead concentrations of O.o76, 0.163 and O.326 mgL-1(76, 163 and 326 ugl-1 respectively) for a period of six weeks in a static assay. The experiment was replicated once and the pooled values presented. Residues of lead in test fish were also • determined with Atomic Absorption Spectrophotometer. The study indicate that sublethal concentrations of lead caused a dose-dependent inpairment in the growth of Tilapia nilotica. The percent weight increase after six weeks were 27.73, 27.11, 23.38 and 20.00 for control, 0.076, 0.163 and O.326 mgL-1 group respectively. The growth rates in the lead-exposed groups were not significantly (p> 0.05) different from that for the control. Growth impairment is attributed to lead interference with energy metabolism in cells mitochondria The values for heamoglobin, haematocrit blood serum protein and liver glycogen in fish exposed to the various concentrations of lead dropped considerably slightly below those for the control. No effect of lead on skeletal muscle glycogen was however observed. iv 'Blacktail' and 'blackhead' lesions were observed in 40% of fish exposed to 0.163 mgL-1 lead after five and six weeks respectively. This was attributed to a probable neurological lead effect or biochemical metabolic inhibition. This observation is in agreement with the occurence of blacktail in lead concentration 0.12 mgL-1 for rainbow trout Salmo gairdueri as reported by Davies et al(l976), Hodson et al(l978), (1982), and Alen et al (1983). Tilapia nilotica accumulated lead concentration up to a level of 8.75 ugg-1 tissue after exposure to 0.326 mgL" lead for six weeks. The livers of test fish exposed to all lead concentrations used in this study degenerated on histological observation, due to the preapitation of the hepatocytes cytoplasm and disintegration of blood vessels.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/6238
dc.language.isoenen_US
dc.subjectTOXIC EFFECTS,en_US
dc.subjectSUBLETHAL,en_US
dc.subjectCONCENTRATIONS,en_US
dc.subjectLEAD,en_US
dc.subjectTilapia,en_US
dc.subjectnilotica(Linnaeus)en_US
dc.titleTOXIC EFFECTS OF SUBLETHAL CONCENTRATIONS OF LEAD ON Tilapia nilotica(Linnaeusen_US
dc.typeThesisen_US
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