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The most important environmental factors affecting the early sexual maturity of Coptodon zilli in Iraq

By: Mohammed Enad Ghazwan

Key Words: Phenomenon, Species, characters, Sexual aspect, Sexual maturity.

Int. J. Biosci. 15(1), 374-382, July 2019.

DOI: http://dx.doi.org/10.12692/ijb/15.1.374-382

Certification: ijb 2019 0049 [Generate Certificate]

Abstract

In this study, we try to find the most important reasons for the early sexual maturity of tilapia Coptodon Zilli in four different regions of Iraq, and the relationship between these factors, such as some of the biological characteristics of these fish with some biological and biometric characteristics between the four regions. The Red belly tilapia Coptodon Zilli is a species of fish in the cichlid family which possesses a great economic significance in fisheries due to its reproduction easiness and speed together with its high capability of adaptation under different environmental conditions. In view of the fact that the abundance studies of C. zillii , which has been bred in aquaculture. By contrast, due to the scarcity of studies that deal with the natural fish population. The current study is mainly concerned with collecting samples of C. zillii out of Iraqi inland waters (four different governments including Baghdad-Babel-Wassit and Maysan ) with the aim of identifying some of its features and characters in the Iraqi environment and investigating the phenomenon of the early sexual maturity of this species. Results show that there are statistically significant differences at a confidence level of about (P< 0.05) among the four given areas in the whole morphometric measurements. Thus,  Maysan samples surpassed other governments in terms of the overall length, head length, and body weight which amount to (16.59 cm), (12.99) cm, (4.30 cm )and (97.19 gram ) respectively. In Babel, means values of the amount of the sample to (14.87 cm), (11.70 cm), (3.79 cm) and (72.67 gram) respectively. Results also show that there are indices of early sexual maturity in C. zillii even though the inland waters are of bad qualities in some areas whether by means of distinguishing features or anatomic characters of those gonads.

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The most important environmental factors affecting the early sexual maturity of Coptodon zilli in Iraq

Akel EH, Moharram SG. 2007. Reproductive boilogy of Tilapia zilli (Grev, 1848) from Abu qir Bay, Egypt. Egyptian Journal of Aquatic Research 33, p 379-394.

Al-Kahem HF, Al-Akel AS, Shamsi M, Ahmed Z. 1988. Food selection of various size groups of the cyprinid fish, Cyprinion mhalensis Al-Kahem & Behnke, 1983 from Saudi Arabia.

Anthoni U, Børresen T, Christophersen C, Gram L, Nielsen PH. 1990. Is trimethylamine oxide a reliable indicator for the marine origin of fish? Comparative Biochemistry and Physiology Part B: Comparative Biochemistry 97(3), 569-571.

Bal JW, Jones JW. 1960. On the growth of the brown trout of Liyn Tagid. Proc. Zool. Soc. Lond., 134, 41.

Bezault E, Clota F, Derivaz M, Chevassus B, Baroiller JF. 2007. Sex determination and temperature-induced sex differentiation in three natural populations of Nile tilapia (Oreochromis niloticus) adapted to extreme temperature conditions. Aquaculture 272, S3-S16.

Dellefors C, Faremo U. 1988. Early sexual maturation in males of wild sea trout, Salmo truttaL., inhibits smoltification.Journal of fish biology (33)5, 741-749.

Chervinski J. 1982. Environmental physiology of tilapias, The Biology and Culture of Tilapia. Proceedings ofthe 7th ICLARM Conference, Manila, Philippines: International Center for Livin, p 119-128.

Chervinski J, Zorn M. 1974. Note on the growth of Tilapia aurea (Steindachner) and Tilapia zillii (Gervais) in sea-water ponds. Aquaculture 4, 249-255.

Chervinski J, Hering E. 1973. Tilapia zillii (Gervais) (Pisces, Cichlidae) and its adaptability to various saline conditions. Aquaculture 2, 23-29.

Cnaani A, Gall GA, E.andHulata G. 2000. Cold tolerance of tilapia species and hybrids. Aquaculture International 8(4), 289-298.

Desprez D, Mélard C. 1998. Effect of ambient water temperature on sex determinism in the blue tilapia Oreochromis aureus. Aquaculture 162(1), 79-84.

Devlin RH, Nagahama Y. 2002. Sex determination and sex differentiation in fish: an overview of genetic, physiological, and environmental influences. Aquaculture 208(3), 191-364.

El-Sawy WMT. 2006. Some biological Aspects of Dominant Fish Population in Lake Edku in Relation to Prevailing Environmental Conditions. M.Sc. thesis, Faculty Sci., Zagazig Univ. Egypt.

Oso, OA. Ogunleye EO, Idowu FA. Majolagbe. 2013. Gonado-Somatic Index, Sex Ratio and Fecundity of Tilapia zilli in a Tropical Reservoir, South West Nigeria. Journal of Biology (1)2, 42-45.

JK, Leet HE, Gall,  Sepúlveda MS. 2011. A review of studies on androgen and estrogen exposure in fish early life stages: effects on gene and hormonal control of sexual differentiation, J.A. Toxicology 31(5), p 379-398.

Innal D, Giannetto D. 2017. Age Structure and Length-Weight Relationship of Non-native Redbelly Tilapia Coptodon zillii (Gervais, 1848) (Cichlidae) in the Pınarbaşı Spring Creek (Burdur, Turkey.

Meyer DE. 2002. Technology for successful small-scale Tilapia culture (CRSP Research Report 02-179). CRSP Research Reports (Aquaculture Collaborative Research Support Program). [Abstract from original paper published in: D. Meyer (Ed). 6to Simposio Centroamericano de Aquacultura Proceedings: Tilapia Sessions, 22–24 August 2001. Tegucigalpa, Honduras, p 97-106.

Negassa A, Padanillay CP. 2008. Abundance, food habits, and breeding season of exotic Tilapia zilli and native Oreochromis niloticus L. fish species in Lake Zwai, Ethiopia. Mj. Int. J. Sci. Tech., 2, pp. 345-359.

Negassa A, Getahun A. 2003. Breeding season, length-weight relationship and condition factor introduced fish, Tilapia zilli Gerv. 1848 (Pisces: Cichlidae) Lake Zwai, Ethiopia. SINET: Ethiopian J. Sci. 26(2), p 115-122.

Qasim SZ. 1957. The Biology of Centronotus gunnellus (L.) (Teleostei). Journal of Animal Ecology, (2)6, 2-401-389.

Rubin DA. 1985. Effect of ph on Sex Ratio in  Cichlids and a Poecilliid (Teleostei). Copeia, 1985(1), 233-235.

Strauss RE. 1979. Reliability Estimates for Ivlevˈs Electivity Index, the Forage Ratio, and a Proposed Linear Index of Food Selection. Transactions of the American Fisheries Society 108(4), 344-352.

Sulaiman Ai-Akel A. 2019. Selection Of Food In Different Size Groups Of Poecilia Latipinna (Lesueur, 1821) From EasternProvince Of Saudi Arabia.

Warner RR. 2019. Sex Changing Organisms and Reproductive Behavior, in: Choe, J.C. (Ed.) Encyclopedia of Animal Behavior (Second Edition). Academic Press, Oxford, p 580-583.

Mahomoud WF, Amin AMM, Elboray KF, Ramadan AM, EL-Halfawy MM. 2011. Reproductive biology and some observation on the age, growth, and management of Tilapia zilli (Gerv, 1848) from Lake Timsah, Egypt. International Journal of Fisheries and Aquaculture 3(2), p 16-26.

Wohlfarth G, Hulata G. 1983. Applied genetics of tilapias. ICLARM studies and review 6.

Mohammed Enad Ghazwan.
The most important environmental factors affecting the early sexual maturity of Coptodon zilli in Iraq.
Int. J. Biosci. 15(1), 374-382, July 2019.
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