O. O. Komolafe
Qualification: B.Sc, M.Sc, Ph.D. (Ife)
Research Area: Fish & Fisheries Ecology
(i) Komolafe, O.O. (1980) – Population dynamics of fish species in Aho-stream, a tributary of Opa Reservoir, Obafemi Awolowo University Ile-Ife. B.Sc. Thesis, University of Ife, Ile-Ife, Nigeria. 33pp.
(ii) Komolafe, O.O. (1985) – The Biology of the Cichlid Fish Tilapia zillii (Gervais) in Opa Reservoir, Obafemi Awolowo University, Ile-Ife. M.Sc. Thesis, University of Ife, Ile-Ife, Nigeria. 77pp.
(iii) Komolafe, O.O. (1995) – The Biology of the fish Oreochromis niloticus (Linnaeus) in Opa Reservoir, Obafemi Awolowo University, lle-Ife. Ph.D. Thesis, Obafemi Awolowo University, Ile-Ife, Nigeria. 156pp.
Books and Monographs (List in this order with dates, pages, reference and publisher):
(i) Authored: Nil.
(ii) Edited: Nil.
Contribution to Books: Nil.
Published Journal Articles
(i) Komolafe, O.O. and Arawomo, G.A.O (1996): The reproduction of Oreochromis niloticus (Linnaeus) in Opa Reservoir, Ile- Ife, Nigeria. Proceedings of the 13th Annual Conference of the Fisheries Society of Nigeria (FISON). New Bussa, Nigeria. 3rd – 8th Nov. 1996. (Ed.A.A.Eyo) pp 97-100.
(ii) Komolafe, O.O. and Arawomo, G.A.O. (1998): The age and growth of Oreochromis niloticus (Linnaeus) in Opa Reservoir, lle-Ife, Nigeria. Bioscience Research Communications. 10(3): 159-166.
(iii) Komolafe, O.O. and Arawomo, G.A.O. (2003): The distribution and feeding habits of a Cichlid fish, Oreochromis niloticus (Linnaeus) in Opa Reservoir. Bioscience Research Communications. 15(5): 379-386.
(iv) Komolafe, O.O. (2004): The age and growth of Tilapia zillii (Gervais) in Opa Reservoir, Ile-Ife, Nigeria. Ife Journal of Science. 6(1): 14-18.
(v) Komolafe, O.O. (2004): Reproductive aspects of a cichlid fish Tilapia zillii (Gervais) (Pisces: Cichlidae) in Opa Reservoir, Ile-Ife, Nigeria. Ife Journal of Science. 6(2): 119-122.
(vi) Komolafe O.O. and Akinpelu A.I. (2005): Parasitic infestation of Oreochromis niloticus Linnaeus (Pisces: Cichlidae) in Opa Reservoir, Ile-Ife, Nigeria. Science Focus. 10(1): 57-61.
(vii) Abayomi, O.S., Arawomo, G.A.O. and Komolafe, O.O. (2005): Distribution, food and feeding habits of a catfish, Clarias gariepinus (Burchell, 1822) in Opa Reservoir, Ile-Ife, Nigeria. Science Focus. 10(1): 62-67.
(viii) Abayomi, O.S., and Komolafe, O.O. (2005): Reproductive aspects of Clarias gariepinus (Burchell, 1822) in Opa Reservoir, Ile-Ife, Nigeria. Science Focus. 10(3): 180-185.
(ix) Komolafe, O.O. (2005): The relative abundance and distribution pattern of Oreochromis niloticus Linnaeus in Opa Reservoir, Ile-Ife, Nigeria. Science Focus. 10(3): 190-194.
(x) Komolafe, O.O. (2005): The breeding biology of Oreochromis niloticus Linnaeus (Pisces: Cichlidae) in Opa Reservoir, Ile-Ife, Nigeria. Journal of Science and Technology. 25(2): 1-8.
(xi) Komolafe, O.O. (2008): Some aspects of the biology of Tilapia zillii (Gervais) (Pisces: Cichlidae) in Opa Reservoir, Ile-Ife, Nigeria. Journal of Science and Technology. 28(1): 49-56.
(xii) Ofusori, D.A., Caxton-Martins, E.A., Komolafe, O.O., Oluyemi, K.A., Adeeyo, O.A., Ajayi, S.A., Oluwayinka, P.O., Adelakun, E.A., Keji, S.T. and Adesanya, O.A. (2008): A comparative study of the ileum in Rat (Rattus norvegicus); Bat (Eidolon helvum) and Pangolin (Manis tricuspis) as investigated using histological method. Int. J. Morphol. 26(1): 137-141.
(xiii) Komolafe, O.O. and Arawomo, G.A.O. (2008): Preliminary observations on fish species in a newly impounded Osinmo Reservoir. Turkish Journal of Fisheries and Aquatic Sciences. 8(2): 289-292.
(xiv) Komolafe, O.O. and Arawomo, G.A.O. (2011): Observations on the composition, physiological condition and fisheries in Erinle Lake, Osun State, Nigeria. West African Journal of Applied Ecology. 18: 71-78.
(xv) Okonji, R.E.; Popoola, M.O.; Komolafe, O.O. and Kuku, A. (2011): The distribution of the enzyme, arginase in the tissues of selected Cichlidae species: Tilapia zillii, Sarotherodon galilaeus and Oreochromis niloticus. West African Journal of Applied Ecology. 18: 47-52.
(xvi) Komolafe, O.O. and Arawomo, G.A.O. (2011): Food and diet relationships of Parachanna obscura (Gunther) and Clarias gariepinus (Burchell) in a newly impounded Osinmo Reservoir, Ejigbo, Nigeria. Cameroon Journal of Experimental Biology :7(1) :9-15.
(xvii) Lawal, O. A. and Komolafe, O.O. (2012): Concentrations of heavy metals in three Tilapine species of an abandoned Gold Mine Reservoir in Igun, Nigeria. Nigerian Journal of Fisheries 9(2): 581-585.
(xviii) Okonji, R.E.; Komolafe, O.O., Popoola, M.O. and Kuku, A. (2013): Effects of seasonal change in Osinmo reservoir on arginase and rhodanese activities in Clarias gariepinus Burchell and Heterotis niloticus Cuvier. African Journal of Agricultural Research. 8(20): 2353-2359.
(xix) Okonji, R.E.; Komolafe, O.O., Ehigie, O.L.; Popoola, M.O. and Kayode S. B. (2013): Thiaminase properties in the fillet and liver of Tilapia zillii from Osinmo Reservoir: A comparative study. African Journal of Food Science. 7(6): 143-149.
(xx) Komolafe, O.O., Adebisi R.A., and Lawal, O.A. (2013): Levels of heavy metal in the fillet, gills and liver of Clarias gariepinus and Parauchenoglanis fasciatus in Aho-stream, Ile-Ife. Nigerian Journal of Fisheries. 10(1&2): 638-641.
(xxi) Komolafe, O.O., Arawomo, G.A.O., Idowu, E.O. and Adedeji, A.A. (2014): Status and Economic impact of the fisheries of Osinmo Reservoir, Ejigbo, Nigeria. Ife Journal of Science. 16(2): 309-317.
(xxii) Okonji, R.E., Ehigie, O.L., Popoola, M.O., Ehigie, A.F. and Komolafe, O.O. (2014): Physicochemical properties of liver Arginase from Heterotis niloticus (Cuvier, 1829). Journal of Science Research. 13: 45-56.
(xxiii) Awodiran, M.O., Majolagbe, F.A., Komolafe, O.O., Adewumi, A.A., Oyebola, O.O. and Oyewole, R.O. (2014): Cytogenetic study and serum protein characterization of Clarias gariepinus (Burchell, 1822) and Heterobranchus bidorsalis (Geoffroy Saint-Hillaire, 1809) in South western Nigeria. Int. J. Biol. Chem. Sci. 8(6): 2377-2386.
(xxiv) Oriyomi, V.O., Okonji, R.E, Komolafe, O.O. and Agboola, F.K. (2015): Determination of cyanide level in Igun Reservoir and in tissues of fishes and activity of cyanide-detoxifying enzymes in these tissues Journal of Ecology and the Natural Environment. 7(8): 228-237.
(xxv) Adedeji, A.A., Komolafe, O.O., Akinrele, O.A. and Adeleke, O. (2015): Water quality and plankton biota of Osinmo reservoir, Osun State, South- west Nigeria, Zoology and Ecology, 25(2): 143-153.
(xxvi) Okonji, R. E., Komolafe, O.O., Fagbohunka, S.B. and Adeoye, O.A. (2015): Rhodanese is a possible enzyme marker for cyanide environmental stress on aquatic life. African Journal of Biotechnology. 14(29): 2270-2272.
(xxvii) Oladimeji, T.E., Awodiran, M.O. and Komolafe, O.O. (2015): Genetic Differentiation Studies among Natural Populations of Tilapia zillii. Notulae Scientia Biologicae. 7(4): 423-429.
(xxviii) Amoo, O.O. and Komolafe, O.O. (2016): Length-Weight Relationships and Condition Factors of Several Nigerian Fish Species. Notulae Scientia Biologicae. 8(1): 21-26.
(xxix) Komolafe, O.O., Olofinmehinti, M.O., Adedeji, A.A. and Adewole, H.A. (2016): The Distribution, Composition and Abundance of fish Species in Two Abandoned Gold Mine Reservoirs, Igun, Osun State, Nigeria. Ife Journal of Science. 18(1): 095-102.
(xxx) Awodiran, M.O., Oladimeji, T.E. and Komolafe, O.O. (2016): Genetic Diversity Studies in Toxicant Stressed Populations of Tilapia zillii in three Nigerian reservoirs. Nature and Science. 14(8): 54-60.
(xxxi) Komolafe, O. O., Obayemi, O. E., Awodiran, M. O. and Oladimeji, T. E. (2017): Histopathological studies of selected organs of Sarotherodon galilaeus (Linnaeus, 1758) in Igun gold mining reservoir and Opa fresh water reservoir, southwestern Nigeria. International Journal of Fauna and Biological Studies, 4(6): 48-56.
(xxxii) Komolafe, O. O., Amoo, T. and Awodiran, M. O. (2018): Food habits and diet relationship in the red belly Tilapia (Tilapia zillii) and (Chromidotilapia guntheri) from an abandoned gold mine reservoir, southwestern Nigeria. Notulae Scientia Biologicae. 10(2): 148-155.
(xxxiii) Komolafe, O.O., Obayemi, O.E. and Lawson, O. (2018): Comparative Histopathological changes in some organs of Tilapia zillii in an abandoned gold mine reservoir of Igun and Opa freshwater reservoir, Ile-Ife, southwestern Nigeria. International Journal of Biology Research, 3(1):
(xxxiv) Amoo, T.O. and Komolafe, O.O. (2018): Assessment of water quality parameters in an artificial lake, southwestern, Nigeria. Tropical
Freshwater Biology, 27(2): 43-55
(xxxv) Obayemi, O.E. and Komolafe, O.O. (2019): Histopathological changes in the gills, fillet and liver of Parachanna obscura in an abandoned gold mine reservoir of Igun and Opa reservoir, Ile-Ife, Nigeria. American Journal of Biology and life sciences 7(1): 1-8.
(xxxvi) Obayemi, O.E., Komolafe, O.O., Okunola, V.K., Asafa, S.T. and Ayoade, T.M. (2019): Length-Weight relationships and condition factors of Three Tilapine species in an abandoned gold mine reservoir, Igun, Southwestern Nigeria. Notulae Scientia Biologicae 11(2): 205-209.
(xxxvii) Obayemi, O.E. and Komolafe, O.O. (2020): Histopathology Studies of Selected Organs of Hemichromis fasciatus inhabiting Igun Gold Mining and Opa Reservoirs, South Western Nigeria: A Comparative Study. International Journal of Advances in Life Science and Technology, 4(1): 1-10.
- PROFESSIONAL ACCOMPLISHMENT:
- Reviewer, Ife Journal of Science
- Reviewer, Environtropica.
- External Examiner, Department of Pure and Applied Biology, Ladoke Akintola University of Technology, Ogbomosho. Sc and PhD Oral Examinations.
- External Examiner, Zoology programme, Department of Biological Sciences, Bowen University, Iwo.
- Internal Examiner, Institute of Ecology, Obafemi Awolowo University, Ile-Ife, M.Sc. Oral Examinations.
- I have successfully supervised many undergraduate students; nine Master students and co- supervised one Ph.D. student. Currently, three M.Sc degree students are working on their research topics under my supervision.
- Internal Examiner, Department of Physics, Obafemi Awolowo University, Ile Ife, M.Sc. Oral Examination.
CURRENT RELEVANT INFORMATION:
Services within the Department:
(i) Member, Committee on admission, registration, examination and results.
(ii) Member, Committee on seminar and Theses vetting.
(iii) Member, Space allocation committee.
Services within the Faculty:
(i) Member, Faculty Board of Studies. (October 1999 – till date).
(ii) Chairman, Biological Sciences Management Committee.
(July 2007 – till date)
Services within the University:
(i) Vice-Chairman, Campus Aesthetic and Trading Regulatory Committee
(CATREC) (2010 to 2016).
(ii) Acting Coordinator, Biological Gardens Unit. (August 2011 – till date).
(iii) Departmental Representative, Faculty Board of Education. (2004 – till date).
(iv) Member, Selection Panel Junior Staff Establishment (2012)
(v) Representative Dean, Faculty of Science on other Boards and Committees of the University for the 2014/2015 Academic Session.
(vi) Representative Dean, Faculty of Science on Faculty selection panel for Institute of Cultural Studies (2014/2015, 2018/2019) Academic Sessions.
(vii) Representative Dean, Faculty of Science on Faculty Review Panel, C.E.R.D. (2018/2019) Academic Session.
- Representative Dean, Faculty of Science on Selection Panel, College of Health Sciences (2018/2019) Academic Session.
- Head, Department of Zoology, OAU, Ile-Ife. (2019 – till date)
Services Outside Obafemi Awolowo University:
(i) Head, Department of Biological Sciences, Elizade University, Ilara- Mokin, Ondo State (2017-2019)
(ii) Dean, Faculty of Basic and Applied Sciences, Elizade University, Ilara- Mokin, Ondo state (2018-2019)
(iii) Member, Management Advisory Committee, Elizade University (2018/2019)
(iv) Member, Business Committee of Senate, Elizade University (2018/2019)
(v) Member, Appointment, Promotions and Disciplinary Committee (2018/2019)
(vi) Member, Board of Post Graduate School, Elizade University (2018/2019)
CONTRIBUTIONS TO KNOWLEDGE:
My contributions to knowledge are based on the population dynamics of freshwater fishes in the South-Western part of Nigeria. My studies involved their food and feeding rhythm/relationships, age and growth, reproduction and fecundity, parasitic infestation as well as environmental impacts with respect to fish families Cichlidae, Clariidae, Channidae and Hepsetidae. These fishes are of high economic importance providing jobs for fishers, fish traders and had contributed to the protein needs of the populace. As reported in papers (i) and (iii) Coptodon zillii and Oreochromis niloticus grew fast in Opa reservoir. A wide range of food items which is a parameter for growth was highlighted in papers (ii), (vi) and (x) with respect to O. niloticus, C. gariepinus and C. zillii respectively while papers (ii) and (x) specifically showed the diurnal feeding rhythms of O. niloticus and C. zillii. Parasitic infestation on C. zillii was low due to very low prevalence and intensity of infestation in paper (v). The distribution pattern of cichlid and clariid fishes in the wild was studied and highlighted in papers (ii), (vi) and (viii) with specific information on their niches.
These fish species have high fecundity, bred throughout the year and are quite abundant in the reservoirs as stated in papers (iv), (vii) and (ix).
The cat-fish, Clarias gariepinus fed on a wide range of food items as highlighted in papers (vi) and (vii). An outstanding of Oreochromis niloticus as a mouth brooder had been reported in paper (ix) and the reproductive strategy highlighted is an assurance of survival of the species in the habitat. Paper (xi) is a comparative study of the Ileum of Rat (Rattus norvegicus); Fruit Bat (Eidolon helvum) and Pangolin (Manis tricuspis) using histological methods to explain structural differences in the anatomy. Paper (xii) reported the comprehensive list of fish species and physico-chemical properties of Osinmo reservoir. Paper (xiii) showed the current physiological conditions of Erinle Lake in relation to its fisheries. Paper (xiv) reported high arginase activity in the tissues of C. zillii, S. galilaeus and O. niloticus of Osinmo reservoir which could be an indication of ureotelism in alkaline waterbody. Paper (xv) examined the food and diet relationships of Parachanna obscura and Clarias gariepinu which indicated there was no diet overlap and competition. Three Tilapia fish species observed in Igun, contained high concentration of heavy metals such as Ar, As, Cd, Cr, Cu, Ni, Pb, Zn, as reported in paper (xvi), suggesting detrimental health implications as a protein source. Papers (xvii) reported that the seasonal changes of enzymes arginase and rhodanese in C. gariepinus and Heterotis niloticus. could be used as indicators of fish population in waterbodies. As shown in Paper (xviii) the thiaminase enzymes activities in the fillet and liver of C. zillii in the reservoir were inhibited by divalent metal ions viz; Zn2+, Sn2+, Mg2+ and Hg2+. Heavy metal concentrations in the liver, fillet and gills of Clarias gariepinus and Parauchenoglanis fasciatus of Aho stream was within the acceptable limits of WHO and FEPA for human consumption (Paper, xix). Paper (xx) showed that fishermen in Osinmo reservoir earned relatively higher income than middle income wage earners of government parastatals. The physicochemical properties of liver arginase of Heterotis niloticus of Osinmo reservoir showed increased activities with Mn2+, Zn2+, Mg2+, Hg2+, Co2+, and Na+ as shown in Paper (xxi). Cytogenetic and serum protein characterization of C. gariepinus and H. bidorsalis indicated chromosome numbers around the modal value suggesting an ongoing speciation (Paper xxii). Paper (xxiii) showed that Igun reservoirs are highly cyanide polluted but its eleven-fish species did not bio-accumulate cyanide in their tissues. As shown in paper (xxiv), variation in abundance of the plankton in the three phases of the raining season was highly significant (P < 0.05) in Osinmo reservoir which might result to pollution. A review of rhodanese as a possible enzyme marker was reported in paper (xxv). The genetic differentiation of C. zillii in natural populations of reservoirs in Osu, Opa and Igun indicated that RAPD technique can be used effectively. In paper (xxvii) the length-weight relationships of the fishes in Strabag Lake showed negative allometric growth (b < 3.0). The distribution, composition and abundance of fish species of Igun in Paper (xxviii) showed that 82.5% of the fishes were caught in reservoir five. Paper (xxix) expresses diversity in the population of toxicant stressed C. zillii in Opa, Osu and Igun reservoirs.
In conclusion, the knowledge of the population dynamics of these aforementioned fish species will enhance their production potentials and invariably their exploitation and management strategies in the various reservoirs by Co-operative fish farmers, NGOs, Aquaculture and Government agencies. The enzyme studies on the species also complemented earlier studies that the fish species were thriving well with high metabolic activities in their habitats. Genetic studies also confirmed the problem of environmental degradation in Igun compared to other waterbodies in the region. The study of heavy metals in fish species also brings to notice the effect of pollution and will serve as a pointer to Local, State and Federal Government of the need to monitor and urgently find solutions to environmental problems.