Tweddle, D. (1975). Age and growth of the catfish Bagrus meridionalis Gunther in southern Lake Malawi. J.Fish Biol., 7:677-685.
Tweddle, D. (1979). The zoogeography of the fish fauna of the Lake Chilwa basin. In Lake Chilwa : studies of change in a tropical ecosystem, edited by Kalk, M., McLachlan, A.J. & Howard- Williams, C. W. Junk, The Hague, Monogr. Biol., 35:171-181.
Tweddle, D. (1983). Breeding behaviour of the mpasa, Opsaridium microlepis (Gunther)(Pisces: Cyprinidae), in Lake Malawi. J. Limnol. Soc. South. Afr., 9(1):23-28.
Tweddle, D. (1987). An assessment of the growth rate of mpasa, Opsaridium microlepis (Günther, 1864) (Pisces: Cyprinidae) by length frequency analysis. J. Limnol. Soc. South. Afr., 13(2):52-57.
Tweddle, D. (1992). Conservation and threats to the resources of Lake Malawi. In Symposium on resource use and conservation of the African Great Lakes, Bujumbura 1989. Mitt. Internat. Verein. Limnol., 23:17-24.
Tweddle, D. (1992a). A brief review of the tourism resources and potential around the African Great Lakes. In Symposium on resource use and conservation of the African Great Lakes, Bujumbura 1989. Mitt. Internat. Verein. Limnol., 23:121-124.
Tweddle, D. (2000). The role of Nkhotakota Wildlife Reserve, Malawi, Africa, in the conservation of the mpasa Opsaridium microlepis (Günther, 1864). In Management and ecology of river fisheries, edited by Cowx, I.G. Fishing News Books, 400-417.
Tweddle, D. (2001). Threatened fishes of the world: Opsaridium microlepis (Günther, 1864) (Cyprinidae). Env. Biol. Fish., 61:72.
Tweddle, D. (2005). Lakes Chilwa and Chiuta. Ecoregion 1. In Freshwater ecoregions of Africa and Madagascar, a conservation assessment, edited by Thieme, M.L., Abell, R., Stiassny, M.L.J., Skelton, P., Lehner, B., Teugels, G.G., Dinerstein, E., Toham, A.K., Burgess, N. & Olson, D. Island Press, Washington, 173-175.
Tweddle, D. (2005a). Mulanje. Ecoregion 43. In Freshwater ecoregions of Africa and Madagascar, a conservation assessment, edited by Thieme, M.L., Abell, R., Stiassny, M.L.J., Skelton, P., Lehner, B., Teugels, G.G., Dinerstein, E., Toham, A.K., Burgess, N. & Olson, D. Island Press, Washington, 259-261.
Tweddle, D. (2005b). Lower Zambezi. Ecoregion 66. In Freshwater ecoregions of Africa and Madagascar, a conservation assessment, edited by Thieme, M.L., Abell, R., Stiassny, M.L.J., Skelton, P., Lehner, B., Teugels, G.G., Dinerstein, E., Toham, A.K., Burgess, N. & Olson, D. Island Press, Washington, 308-311.
Tweddle, D. (2007). First record of the river goby Glossogobius callidus (Smith, 1937) from Malawi. African Journal of Aquatic Science, 32(1): 89.
Tweddle, D. & Anderson, M.E. (2008). A collection of marine fishes from Angola, with notes on new distribution records. Smithiana, 8:3-24.
Tweddle, D., Balirwa, J., MacLennan, D., Okaronon, J., Tumwebaze, R., Getabu, A. & Bassa, S. (2006). Occurrence of Barbus profundus Greenwood 1970 (Teleostei: Cyprinidae) in mid-water in Lake Victoria. African Journal of Aquatic Science, 31(1):155-157.
Tweddle, D., Bills, R., van der Waal, B., Skelton, P., Kolding, J. & Nengu, S. (2003). Fish diversity and fisheries in the Okavango Delta, Botswana. In A rapid biological assessment of the aquatic ecosystems of the Okavango Delta, Botswana: high water survey, edited by Alonso, L.E. & Nordin, L. RAP Bulletin of Biological Assessment, Conservation International, Washington DC., 97-110 & 210-245.
Tweddle, D. & Bodington, P. (1988). A comparison of the effectiveness of black and white gillnets in Lake Malawi, Africa. Fisheries Research, 6(3):257-269.
Tweddle, D. & Bowa, A. (1990). Gillnetting experiments in Lake Malawi, Africa: (1) Multicoloured gillnet trials, with a review of previous coloured net trials. Collected Reports on Fisheries Research in Malawi. Occasional Papers, Volume 1:37-46.
Tweddle, D. & Bowa, A. (1990a). Gillnetting experiments in Lake Malawi, Africa: (2) A comparison of catches using nets with different mounting ratios. Collected Reports on Fisheries Research in Malawi. Occasional Papers, Volume 1:47-56.
Tweddle, D. & Crossley, R. (1991). Effects of an earthquake on demersal cichlid fishes of southern Lake Malawi. J. Fish Biol., 38(2):305-308.
Tweddle, D. & Davies, M.T.T. (1997). Preliminary observations on the fish populations of the recently-impounded Katse Reservoir, Lesotho. Sth. Afr. J. aquat. Sci., 23(2):7-20.
Tweddle, D., Eccles, D.H., Frith, C.B., Fryer, G., Jackson, P.B.N., Lewis, D.S.C. & Lowe-McConnell, R.H. (1997). Cichlid spawning structures - bowers or nests? Env. Biol. Fish., 51:107-109.
Tweddle, D. & Lewis, D.S.C. (1990). The biology of usipa (Engraulicypris sardella) in relation to fluctuations in productivity of Lake Malawi and species introductions. Collected Reports on Fisheries Research in Malawi. Occasional Papers, Volume 1:67-72.
Tweddle, D., Lewis, D.S.C. & Willoughby, N.G. (1979). The nature of the barrier separating the Lake Malawi and Zambezi fish faunas. Ichthyol. Bull. Rhodes Univ., 39:1-9.
Tweddle, D. & Magasa, J.H. (1989). Assessment of yield in multi-species cichlid fisheries of the South East Arm of Lake Malawi, Africa. J. Cons. int. Explor. Mer, 45(2):209-222.
Tweddle, D. & Skelton, P.H. (1998). Two new species of Varicorhinus (Teleostei: Cyprinidae) from the Ruo River, Malawi, Africa, with a review of other southern African Varicorhinus species. Ichthyol.Explor. Freshwaters, 8(4):369-384.
Tweddle, D. & Skelton, P.H. (2008). New species of ‘Barbus’ and Labeobarbus (Teleostei: Cyprinidae) from the South Rukuru River, Malawi, Africa. Smithiana, 8:25-39.
Tweddle, D., Turner, G.F. & Seisay, M. (1995). Changes in species composition and abundance as a consequence of fishing pressure in Lake Malombe, Malawi. In The impact of species changes in African lakes, edited by Pitcher, T.J. & Hart, P.J.B. Chapman and Hall, London, 413-424.
Tweddle, D. & Turner, J.L. (1977). Age, growth and natural mortality rates of some cichlid fishes of Lake Malawi. J. Fish Biol., 10:385-398.
Tweddle, D. & Tweddle, S.C. (1984). Weaver nest predation by an African Fish Eagle. Ostrich, 55:35-36.
Tweddle, D. & Willoughby, N.G. (1979). An annotated checklist of the fish fauna of the River Shire south of Kapachira Falls, Malawi. Ichthyol. Bull. Rhodes Univ., 39:11-22. Abbreviated version issued in Nyala, 5(2):74-91.
Tweddle, D. & Willoughby, N.G. (1982). The distribution and identification of mormyrid fishes in Malawi, with notes on the synonymy of Marcusenius nyasensis and M. livingstonii (Mormyriformes: Mormyridae). Spec. Publ. J.L.B. Smith Inst. Ichthyol., (24):11 pp.
Anderson, M.E. & Tweddle, D. (2002). A new species of Physiculus (Teleostei: Moridae) from the Southeastern Atlantic. Arch. Fish. Mar. Res., 50(1):17-22.
Banda, M., Tomasson, T. & Tweddle, D. (1996). Assessment of the trawl fisheries of the South East Arm of Lake Malawi using exploratory surveys and commercial catch data. In Stock assessment in inland fisheries, edited by Cowx, I. Fishing News Books, 53-75.
Crossley, R. & Tweddle, D. (1984). A note on some sedimentary features revealed by echosounding in Lake Malawi, Africa. Trans.geol.Soc.S. Afr., 87:45-51.
Lewis, D.S.C. & Tweddle, D. (1990). Breeding seasonality in some commercially important trawl-caught fish species in southern Lake Malawi. Collected Reports on Fisheries Research in Malawi. Occasional Papers, Volume 1:23-36.
Lewis, D.S.C. & Tweddle, D. (1990a). The yield of usipa (Engraulicypris sardella) from the Nankumba Peninsula, Lake Malawi (1985-1986). Collected Reports on Fisheries Research in Malawi. Occasional Papers, Volume 1:57-66.
Njiru, M., Othina, A.N., Getabu, A., Tweddle, D. & Cowx, I.G. (2002). Is the invasion of water hyacinth, Eichhornia crassipes Solms (Mart.), a blessing to Lake Victoria fisheries? In Management and ecology of lake and reservoir fisheries, edited by Cowx, I.G. Fishing News Books, Oxford, 255-263.
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