Sex Ratio, Fecundity, Gonado-Somatic Index, Length-Weight Relationship and Growth Condition of Sarotherodon melanotheron (Rüppell, 1852) inhabiting Lagos Lagoon, Nigeria
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This study estimated the sex ratio, fecundity, gonado-somatic index, condition factor and length-weight relationship of Sarotherodon melanotheron inhabiting Lagos Lagoon, Nigeria. A total of 80 fish samples were collected fortnightly with castnets in August 2020, and the sex ratio (3.21:1) was male biased (X2 = 22.05) and revealed a significant deviation from the expected 1:1. The minimum and maximum number of eggs counted in the fish were 251 and 370, respectively, while the mean was 331.37±55.64. The female fish had the highest gonado-somatic index, GSI (3.11%), followed by combined sexes (1.44%) and males (0.82%). The regression equation of the length-weight relationship indicated hypoallometric growth for males (W = 1.58L-0.07) and combined sexes (W = 1.74L-0.50), and hyperallometric growth for females (W = 3.15L-4.42). The condition factor ranged from 1.86 (female) to 2.20 (male), while the K of both sexes was 2.11. The result also revealed that TL (r = 0.975), SL (r = 0.931) and WT (1.000) of the fish were positively and significantly correlated with the fecundity of the fish at p < 0.05. This study therefore established that the study area was conducive for the fish and that their fecundity was directly proportional to their sizes. For conservation and management of S. melanotheron, it is recommended that monitoring of fishing be ensured
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. Olawusi-Peters, O.O., Ajibare A.O. and Olowoyeye I.M. (2015): Gut content analysis and condition factor of Ethmalosa fimbriata (Bowdish 1825), from Badagry Lagoon, Nigeria. Proceedings of the 8th Annual Conference of the School of Agriculture and Agricultural Technology, Federal University of Technology, Akure, Federal University of Technology, Akure. 18th to 20th March, 2015. pp.185-190.
Indarjo A., Salim G., Nugraeni C.D., Zein M., Ransangan J., Prakoso L.Y., Suhirwan, Anggoro S. (2021): Length-weight relationship, sex ratio, mortality and growth condition of natural stock of Macrobrachium rosenbergii from the estuarine systems of North Kalimantan, Indonesia. Biodiversitas 22(2): 846-857 DOI: https://doi.org/10.13057/biodiv/d220239
Jega I.S., Miah M.I., Haque M.M., Shahjahan M., Ahmed Z.F. and Fatema M.K. (2017): Sex ratio, length-weight relationships and seasonal variations in condition factor of menoda catfish Hemibagrus menoda (Hamilton, 1822) of the Kangsha River in Bangladesh. International Journal of Fisheries and Aquatic Studies. 5(5): 49-54.
Fryxell DC, Arnett HA, Apgar TM, Kinnison MT, Palkovacs EP. (2015): Sex ratio variation shapes the ecological effects of a globally introduced freshwater fish. Proc. R. Soc. B 282: 20151970. http://dx.doi.org/10.1098/rspb.2015.1970
Kahn AT, Kokko H, Jennions MD. (2013): Adaptive sex allocation in anticipation of changes in offspring mating opportunities. Nat. Commun. 4, 1603. https://doi.org/10.1038/ncomms2634
Arendt JD, Reznick DN, Lo´pez-Sepulcre A. (2014): Replicated origin of female-biased adult sex ratio in introduced populations of the Trinidadian Guppy (Poecilia reticulata). Evolution 68, 2343–2356. https://doi.org/10.1111/evo.12445
Hall RO, Koch BJ, Marshall MC, Taylor BW, Tronstad LM. 2007 How body size mediates the role of animals in nutrient cycling in aquatic ecosystems. In Body size: the structure and function of aquatic ecosystems (eds AG Hildrew, DG Raffaelli, R Edmonds-Brown), pp. 286–305. New York, NY: Cambridge University Press.
Loto, O.O., Ajibare, A.O. and Abah, J.P. (2021a): Gut Contents, Feeding Ecology and Condition Factor of Sarotherodon melanotheron inhabiting Lagos Lagoon, Nigeria. International Journal of Science and Global Sustainability. 7(2): 69-74.
Ajibare, A.O., Omobepade B.P. and Loto O.O. (2020): Condition Factor and Length-Weight Relationship of Berried African River Prawn (Macrobrachium vollenhovenii) in Asejire Reservoir, Nigeria. West African Journal of Fisheries and Aquatic Sciences 1(1): 35-42.
Amulejoye F.D., Ajibare A.O., Arosoye A.S., Adegeye A.T. (2022): Occurrence of parasites, length-weight relationship and condition factor of Sarotherodon melanotheron (Ruppel, 1852) in Ilaje Local Government Area of Ondo State, Nigeria. Agricultural Science and Technology, 14 (3): 67-73. https://doi.org/10.15547/ast.2022.03.038
Fagade, S.O., (1978). Age determination of Tilapia melanotheron (Ruppel) in the Lagos Lagoon, Nigeria. International Symposium on Ageing of fish in Bagenal, Teseh., pp: 71-77.
Omoniyi, I. T. and Agbon, A. O. (2008): Morphometric Variations in Sarotherodon melanotheron (Pisces: Cichlidae) from Brackish and Fresh Water Habitats in South-western Nigeria. West African Journal of Applied Ecology. 12: 1-5
Ndimele, P.E., Kumolu- Johnson, C.A., Aladetohun, N.F., and Ayorinde, O.A. (2010): Length-weight relationship, condition factor and dietary composition of Sarotherodon melanotheron, Rüppell, 1852 (Pisces: cichlidae) in Ologe Lagoon, Lagos, Nigeria. Agriculture and Biology Journal of North America. 1(4): 584-590.
Kuton MP and Adeniyi BT (2014) Morphological variations of Tilapia guineensis (Bleeker 1862) and Sarotherodon melanotheron (Ruppell1852) (Pisces: Cichlidea) from Badagry and Lagos lagoon, South-West, Nigeria. J Fisheries Livest Prod 2: 112. https://doi.org/10.4172/2332-2608.1000112
Adeogun A.O., Ibor O.R., Chukwuka A.V., Regoli F. and Arukwe A. (2019): The intersex phenomenon in Sarotherodon melanotheron from Lagos lagoon (Nigeria): Occurrence and severity in relation to contaminants burden in sediment. Environmental Pollution 244: 747-756. https://doi.org/10.1016/j.envpol.2018.10.091
Adegbola I.P., Aborisade B.A. and Adetutu A. (2021): Health risk assessment and heavy metal accumulation in fish species (Clarias gariepinus and Sarotherodon melanotheron) from industrially polluted Ogun and Eleyele Rivers, Nigeria. Toxicology Reports 8 (2021) 1445–1460 https://doi.org/10.1016/j.toxrep.2021.07.007
Ogunbambo M.M. And Benson A.E. (2023): Proximate Composition of Sarotherodon melanotheron and Socio-Economic Analyses of Cast Net among Artisanal Fishers in Lagos Lagoon (Nigeria). Transylv. Rev. Syst. Ecol. Res. 25.1 (2023), "The Wetlands Diversity (73 ~ 80). https://doi.org/10.2478/trser-2023-0006
Loto O.O., Ajibare, A.O. and Chukwu, L.O. (2021b): Effects of Some Environmental Factors on Biochemical Profile of a Cichlid (Sarotherodon melanotheron) in the Lagos lagoon, Southwestern, Nigeria. Applied Tropical Agriculture. 26 (1): 54-61
Ajibare, A.O. and Loto, O.O. (2023): Risks Assessment of Copper (Cu), Lead (Pb), Mercury (Hg) and Zinc (Zn): A case study of Tilapia guineensis in Lagos Lagoon. Ghana Journal of Agricultural Science 58(1): 77– 84. https://dx.doi.org/10.4314/gjas.v58i1.7
Olaosebikan, B. D. and Raji, A. (2013). Field guide to Nigerian Freshwater Fishes. Revised Edition. Federal College of Freshwater Fisheries Technology, New Bussa, Nigeria, 144pp.
Shoesmith E. 1990, A comparision of methods for estimating mean fecundity. J. Fish Biology 36: 29-37.
Gómez-Márquez J.L., Peña-Mendoza B., Salgado-Ugarte I.H. and Guzmán-Arroyo M. (2003): Reproductive aspects of Oreochromis niloticus (Perciformes: Cichlidae) at Coatetelco lake, Morelos, Mexico. Rev. Biol. Trop. 51(1): 221-228.
Olawusi-Peters O.O., Ajibare A.O. and Bello-Olusoji O.A. (2014). Length-Weight Relationship and Condition Factor of Shrimps in Coastal Waters of Ondo State, South West, Nigeria. International Journal of Fisheries and Aquatic Studies. 1(3B): 137-142.
Quarcoopome T. (2017). Length-Weight Relationship, Condition Factor and Sex Ratio of Two Chrysichthys Species (Pisces: Claroteidae) Of Socio-Economic Importance From Kpong Reservoir In Ghana. Ghana J. Sci. 57, 13-22
Fawole, O.O., Arawomo, G.A.O., (2000): Some aspect of the reproductive biology of Sarotherodon galliaeus (Artedi) in the Opa Reservoir Ile-Ife, Nigeria. Journal of Scientific Research.4(1), 107 -111.
Oso, J.A.; Idowu, E.O; Edward, J.B; Adewumi, A.A. and Fadiya O. (2017): Condition Factor and Dietary Composition of Oreochromis niloticus from Ero Dam in Ikun Ekiti, Ekiti State, Nigeria. International Journal of Agriculture and Environmental Research 3(3):2995-3004.
Ajibare, A.O.; Olawusi-Peters, O.O. and Bello-Olusoji, O.A. (2017): Effects of Seasons on the Length-Weight Relationship and Condition Factor of two Brackish Water Shrimps in Ondo State, Nigeria. Nigerian Journal of Agriculture, Food and Environment. 13(3):52-58.
Bagenal T. B. and Tesch, F. W. (1978): Methods of Assessment of Fish Production in Fresh Waters. IBP Handbook No 3, 3rd ed. Oxford Blackwell Scientific Publication, London. 101- 136.
Ramos-Cruz, S. (1995): Reproducción y crecimiento de la mojarra tilapia (Oreochromis aureus) en la Presa Benito Juárez, Oaxaca, México, en 1993. INP-SEMARNAP. México, Ciencia Pesquera No. 11: 54-61.