Dr. Elsayed Ahmad Khallaf

Dr. Elsayed Ahmad Khallaf

Professor of Freshwater ecology and biology
Menofia University, Egypt


Highest Degree
Ph.D. in Ecology from Menofiya University, Egypt

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Area of Interest:

Biomedical Sciences
100%
Zoology
62%
Ecology
90%
Microbioecology
75%
Histology
55%

Selected Publications

  1. Garawani, I., E. Khallaf, A. ei and R. Elgendy, 2019. RNA/DNA ratio and expression of GHR and IGF-1 hormones: A study on seasonal variation effect on growth characterization of male Oreochromis niloticus. Egypt. J. Exp. Biol. (Zoo.), 15: 183-190.
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  2. Khallaf, E.A., M.M.N. Authman, M. Galal and R.A. Zaid, 2018. A comparative biological study on Oreochromis niloticus from two Nilotic canals in the delta of Egypt. Egypt. J. Aqua. Biol. Fish., 22: 39-63.
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  3. Khallaf, E.A. and M.M. Authman, 2018. Contamination and ecological hazard assessment of heavy metals in freshwater sediments and Oreochromis niloticus (Linnaeus, 1758) fish muscles in a Nile River Canal in Egypt. Environ. Sci. Pollut. Res., (In Press). 10.1007/s11356-018-1521-5.
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  4. Galal, M., E. Khallaf, A. El-Naenae and A. Mousa, 2018. Comparative study on two different waste-water treatments plants in El-Menoufeyia Province, Egypt. J. Egypt. Acad. Soc. Environ. Dev., 19: 19-31.
  5. Khallaf, E.A., M.M. Authman and A.A. Alne-na-ei, 2017. Evaluation of organochlorine and organophosphorus pesticides residues in the sediment and muscles of Nile tilapia Oreochromis niloticus (Linnaeus, 1758) fish from a River Nile Canal, Egypt. Int. J. Environ. Stud., (In Press). 10.1080/00207233.2017.1378019.
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  6. Khallaf, E.A., A.A. Alnenaei and R.M. Elgindy, 2017. Fish biology and fishery of Oreochromis niloticus in bahr shebeen canal, delta of Egypt. Egypt. J. Aqua. Biol. Fish., 20: 83-88.
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  7. Galal, M., E. Khallaf, A. Alne-na-ei and A. Mousa, 2017. Comparison between different water-treatment works in El-menoufeyia province, Egypt. J. Egypt. Acad. Soci. Environ. Develop., 18: 171-181.
  8. Khallaf, E.A., M. Galal, M.M.N. Authman and R.A. Zaid, 2016. A comparative study on the water quality of two nilotic canals in the delta of Egypt. J. Aqua. Res. Dev., Vol. 7. 10.4172/2155-9546.1000462.
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  9. Authman, M.M., M.S. Zaki, E.A. Khallaf and H.H. Abbas, 2015. Use of fish as bio-indicator of the effects of heavy metals pollution. J. Aquacult. Res. Dev., Vol. 6. 10.4172/2155-9546.1000328.
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  10. Khallaf, E.A., M. Galal, S. El-Sbbagh and N.M. Nabet, 2014. A study of the physico-chemical characteristics of raw, filtered and treated water at a water treatment plant in Shebin El-Kom, Egypt. Egypt. J. Aquat. Biol. Fish., 18: 115-125.
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  11. Galal, M., E.A. Khallaf, S. El-Sbbagh and N.M. Nabet, 2014. Population analyses of microfauna at a water treatment plant at Shebeen Alkoom, Minufeya, Egypt. Egypt. J. Aquat. Biol. Fish., 18: 127-138.
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  12. Galal, M., E.A. Khallaf, A.A. Alnenaei and A. Yehia, 2013. A comparison of certain ecological aspects at surface and ground water Treatment Works in Elmenofiya Province, Egypt. J. Egypt. Acad. Soci. Environ. Dev., 14: 145-154.
  13. Khallaf, E.A. and M.N. Authman, 2010. Some biological aspects of the Nile mormyrid fish, (Mormyrus kannume, Forsskal, 1775), from Bahr Shebeen Nilotic Canal, Egypt. World J. Fish Mar. Sci., 2: 357-375.
  14. Khallaf, E.A. and M.N. Authman, 2009. Oogenesis of females of the Nile mormyrid fish, Mormyrus kannume (Forskal, 1775) from Bahr Shebeen Canal, Egypt. Egypt. J. Aquat. Biol. Fish., 13: 333-359.
  15. Authman, M.N. and E.A. Khallaf, 2009. Spermatogenesis of male Mormyrus kannume (Forskal,1775) (Teleostei, Mormyridae) from Bahr Shebeen Nilotic Canal, delta, Egypt. Egypt. J. Aquat. Biol. Fish., 13: 361-384.
  16. Alne-na-ei, A.A., S.E. Hassabelnaby, E.A. Khallaf, K.A. Elhalfawy and I.M. Abumurad, 2004. Morphometry and DNA fingerprinting by RAPD-PCR of fish species in Bahr Shebeen Nilotic Canal. J. Union Arab. Biol., 22: 181-211.
  17. Khallaf, E.A., M. Galal and M. Authman, 2003. The biology of Oreochromis niloticus in a polluted canal. Ecotoxicology, 12: 405-416.
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  18. Khallaf, E.A., 2002. An ecological assessment of Bahr Shebeen Nilotic Canal: A review paper. J. Union Arab Biol. Cairo A Zool., 17: 65-75.
  19. Abdeen, A.M., E.A. Khallaf, I.A. El-Elimy, D. Passia and F.A. El-Mesady, 2002. Histological, histochemical and ultrastructural studies on the testes of the Poecilid fish Poecilia Melanogaster under the influence of different temperatures. J. Ger. Soc. Zool., 38: 63-93.
  20. Khallaf, E.A., H. Elnabi, Z.T. Zaki and O. Badr, 2001. The protective effect of ascorbic acid on the histological changes caused by the herbicide (Ronstar) in nilotic catfish: Clarias lazera (C. gariepinus). Egypt. J. Aquat. Biol. Fish., 5: 205-217.
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  21. Khallaf, E.A., D. Passia, A.M. Abdeen and F. El-mesady, 2001. The effect of temperature variation on the sex composition and growth of Poecilia melanogaster offsprings. Egypt. J. Aquat. Biol. Fish, 5: 29-34.
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  22. Khallaf, E.A., A.A. Aine-na-ei, M.G. Ibrahim and I.K. Abu-Mourad, 2001. Food interspecific interactions among some catfish species in a Nile Canal. Egypt. J. Aquat. Biol. Fish., 5: 37-53.
  23. Abdeen, A.M., E.A. Khallaf, D. Passia, I.A. El-Elaimy and F. El-Mesady, 2000. Ultrastructure and histochemical studies on the ovary of the poecilid fish Poecilia melanogaster under the influence of different temperatures. J. Union. Arab Biol., 4: 507-529.
  24. Khallaf, E.A., S.E.H. El-Nabi and O.M. Badr, 1998. The protective effect of ascorbic acid against the mutagenicity of the herbicide (Ronstar) in Nilotic catfish: Clarias lazera. J. Egypt. Ger. Soci. Zool., 25: 139-158.
  25. Khallaf, E. A. and A. Aine-na-ei, 1997. Ecological and histological studies on the female reproductive cycle of Barbus bynni (Forskal, Teleostei: Cyprinidae) in Bahr Shebeen Nilotic Canal. J. Egypt. Ger. Soci. Zool., 23: 1-17.
  26. Galal, M., E. Khallaf and M. Authman, 1997. Population densities of some freshwater types of zooplankton and their response to various ecological factors in two drainage canals in EL-Menofeyia Province, Egypt. J. Union Arab Biol. Cairo, 8: 253-277.
  27. Latif, A.F.A. and E.A. Khallaf, 1996. Ecological distribution, feeding and growth of Eutropius niloticus in lake Nasser (During the period form 1972 to 1974. J. Egypt. Ger. Soci. Zool., 20: 187-221.
  28. Khallaf, E.A., T.Z. Zaki and A. Aine-na-ei, 1996. Reproductive cycle of male Labeo niloticus (Forskal, Pisces, Teleostei:Cyprinidae) from Bahr Shebeen Canal. Egypt. J. Union. Arab. Biol., 5: 51-67.
  29. Khallaf, E.A. and A. A. Alne-na-ei, 1995. A study of age and growth of Labeo niloticus (Pisces,Cyprinidae) in Bahr Shebeen Canal. J. Union. Arab Bio., Zool., 3: 199-205.
  30. Khallaf, E.A., M. Galal and M. Authman, 1994. A study of pesticides residues in Oreochromis niloticus (L.) muscles from a Nile drainage canal. J. Egypt Ger. Soc. Zool., 15: 491-508.
  31. Bayomi, M.F.F., E.A. Khallaf and N. Gaber, 1994. Seasonal variation in nucleic acid (DNA), protein content and RNA/DNA ratio in relation to eproduction and growth of Clarias lazera (Cuv. and Val.) in Bahr Shebeen Canal. J. Egypt Ger. Soc. Zool., 14: 571-594.
  32. Khallaf, E.A., M.F.F. Bayomy and N. Gaber, 1993. Growth and mortality of Clarias lazera (Cuv and Val) in bahr shebeen nile canal, and use of some biochemical parameters as indicators of growth. J. Egypt. Ger. Soc. Zool., 10: 35-59.
  33. Khallaf, E.A., 1992. A study of some population characteristics of Chrysichthys rueppelli (Blgr) from Bahr Shebeen Nilotic Canal. J. Egypt. Ger. Soc. Zool., 7: 45-63.
  34. Khallaf, E.A. and M.N. Authman, 1992. Changes in diet, prey size and feeding habit in Bagrus bayad and possible interactions with B. docmac in a Nile canal. Environ. Biol. Fish., 34: 425-431.
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  35. Khallaf, E.A. and A.M. Khafagy, 1992. A new method for measuring mechanical properties for fish vertebrae. Sci. J. Fac. Sci. Menoufia Univ., 6: 1-13.
  36. Khallaf, E.A., M.M. Elsaadany and M.N. Authman, 1991. Oogenesis of Bagrus bayad forsk. (Bagridae, Teleostei). J. Egyptian German Soc. Zool., 3: 1-14.
  37. Khallaf, E.A., 1991. A new method for determining predators size range of fish competing over prey size. J. Egypt. Ger. Soc. Zool., 4: 1-7.
  38. Khallaf, E.A. and N. Gaber, 1991. Analyses of stomach contents and intraspecific interaction over diet of Clarias lazera (Cuv. and Val.) in Bahr-Shebeen canal. Bull. Fac. Sci. Zagazig Univ., 13: 481-499.
  39. Khallaf, E.A. and M. Authman, 1991. Growth and mortality of Bagrus bayad (Forskal) in Bahr Shebeen nilotic canal. J. Egypt. Germ. Soc. Zool., 4: 87-109.
  40. Khallaf, E.A. and M. Authman, 1991. A study of some reproduction characters of Bagrus bayad, Forskal, in Bahr Shebeen Canal. J. Egypt. Ger. Soc. Zool., 4: 123-138.
  41. Latif, A.F.A., E.A. Khallaf and A.A. Alne-Na-Ei, 1989. Effect of selectivity of trammel nets upon growth and mortality of two Tilapia species. Bull. Inst. Oceanogr. Fish. AR Egypt, 15: 253-260.
  42. Khallaf, E.A. and N. Gaber, 1989. The gametogenesis of Tilapia zillii, gervias. Delta J. Sci., 13: 1701-1721.
  43. Khallaf, E.A. and N. Gaber, 1989. Histological changes in Oreochromis niloticus, L. developing ovaries due to oral administration of Ethynylestradiol and Norethindrone. Bull. hst. Oceanogr Fish., ARE, 15: 237-251.
  44. Khallaf, E.A., 1988. Effect of impoundment on the growth and fishery of Bagrus docmac in Lake Nasser. Regulated Rivers: Res. Manage., 2: 547-552.
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  45. Latif, A.F.A. and E.A. Khallaf, 1987. Growth and mortality of Tilapia species in Lake Nasser. Sci. J. Faculty Sci. Menoufia Univ., 1: 34-53.
  46. Khallaf, E.A., 1987. Feeding ecology of Oreochromis niloticus (Linnaeus) and Tilapia zillii (Gervias) in a Nile canal. Hydrobiologia, 146: 57-62.
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  47. Khallaf, E.A. and A.F.A. Latif, 1987. Population dynamics of Tilapia species and potential yield prediction in Lake Nasser. Sci. J. Fac. Sci., Minufiya Univ., 1: 186-203.
  48. Khallaf, E.A., A.F.A. Latif and A.A. Alnenaei, 1986. Reproduction of Tilapia nilotica and T. zillii in a Nile canal and its interaction with the environment. Delta J. Sci., 10: 724-747.
  49. Latif, A.F.A. and E.A. Khallaf, 1976. Mortality rates of Lates niloticus, L. in lake nasser. Hydrobiologia, 50: 27-32.
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