CONSERVATION:
When considering its total distribution and status, the Nile crocodile is not considered seriously endangered per se, although in some areas it is badly depleted and in danger of being extirpated from some countries. Extensive population surveys in some areas have contributed to sustainable-yield management programs, mainly in southern and eastern African countries. These have been part of the monitoring necessary for those countries trying to establish sustainable use programs encouraged by IUCN and CITES. Central and western countries have seen much fewer population surveys conducted, and in general most countries (two thirds of African countries) have very little information regarding status.
After a population decline around the middle of the century due to over-hunting, legal protection has resulted in significant recoveries in several areas, and large populations can now be found (e.g. Botswana, Ethiopia, Kenya, Zambia, Zimbabwe). However, even with the lack of survey information, it appears that numbers in central and western countries are faring badly. This may be partly due to habitat differences, and the presence of two other sympatric species of crocodile (C. cataphractus and O. tetraspis). Humans do come into conflict with C. niloticus in several areas (e.g. mortality due to crocodiles has been reported frequently in Tanzania), and this fuels the need to establish more sustainable-yield management programs, together with educational programs. The skin from this species is considered to be a 'classic' skin, in that high-quality leather is obtainable without blemish-causing osteoderms reducing its value. Commercial utilisation is widespread, therefore, and many successful management programs have been established (e.g. Zimbabwe, South Africa). These have mainly been set up in conjunction with CITES, with the emphasis being placed upon ranching programs. Countries which still have certain quotas that can be harvested from the wild are moving towards establishing their own ranching programs (e.g. Madagascar). These initiatives are perhaps responsible for the lack of illegal trade in this species, which is currently considered to be insignificant.
Further conservation goals should include detailed surveys in western and central African countries, and the nurturing of newly-established management programs. Ecological research into population dynamics should also provide valuable information for sustainable-yield programs.
MORE INFORMATION:
For more information on distribution and conservation issues for this species,see the CSG Action Plan resource.
SIGNIFICANT REFERENCES:
Blake, DK & Jacobsen, N (1992). The conservation status of the Nile crocodile (Crocodylus niloticus) in South Africa. In: Conservation and Utilization of the Nile Crocodile in Southern Africa. Handbook on Crocodile Farming. Crocodilian Study Group of South Africa, Pretoria. pp. 11-21
Cott, HB (1961). Scientific results of an inquiry into the ecology and economic status of the Nile crocodile (Crocodylus niloticus) in Uganda and Northern Rhodesia. Trans. Zool. Soc. London. 29: 211-358
Craig, GC (1992). A population model for the Nile crocodile with an analysis of sustainable harvesting strategies. In: Crocodiles. Proceedings of the 11th Working Meeting of the Crocodile Specialist Group. IUCN, Gland, Switzerland. pp. 78-81
Fergusson, RA (1992). A radiotelemetry and mark-recapture experiment to assess the survival of juvenile crocodiles released from farms into the wild in Zimbabwe. In: Crocodiles. Proceedings of the 11th Working Meeting of the Crocodile Specialist Group. IUCN, Gland, Switzerland. 98-106
Games, I (1990). Nile Crocodile Feeding Ecology. Unpublished PhD thesis.
Hutton, JM (1984). Population Ecology of the Nile Crocodile. Unpublished PhD thesis.
Hutton, JM (1989). Movement, home range, dispersal and separation of size classes in Nile crocodiles. Amer. Zoologist 29(3): 1033-1050
Modha, ML (1967). The ecology of the Nile crocodile (Crocodylus niloticus Laurenti) on Central Island, Lake Rudolf. E. Afr. Wildl. J. 5: 74-95