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Specialist Consultants in the Aquatic Environment



Presenting regularly at UK and International scientific conferences, members of THA Aquatic have authored many peer-reviewed papers, articles and books.

We work at the front line of emerging regulation and key personnel are lead authors on UK Environment Agency ‘best practice’ guidance documents that continue to shape developments in the sector.

Scientific Research:
  • Brown, D.J.A and Turnpenny, A.W.H., 1988. Effects on fish. Acid rain and Britain’s natural ecosystems. ICCET
  • S.Stakénas, G.H.Copp and R.A.Horsfield. Overlapping home range of introduced pumpkinseed Lepomis gibbosus and native brown trout Salmo trutta in a small English stream: seasonal variations in microhabitat repartition. Freshwater Biology (In Press)
  • C.M.Knight, R.A.Horsfield, K.Anderson and A.W.Turnpenny. Influences of stock density and environmental variables on Atlantic salmon upstream migrations on the River Thames, UK. Proceedings of The Atlantic Salmon Trust 40th Anniversary Conference. Southampton. (In Press)
  • Species Account: Bullhead Cottus gobio. Freshwater fishes in Britain – the species and their distribution. pp 124 – 126. Ed. R.A.Horsfield, Davies, C et al. Harley Books 2004.
  • Klaar, M., Copp, G. H., Horsfield, R. A. 2004. Autumnal habitat use of non-native pumpkinseed Lepomis gibbosus and associations with native fish species in small English streams. Folia Zool. 53(2): 189-202.
  • Humphreys, J., Harris, M. R., Herbert, R. J., Farrell, P., Jensen, A., & Cragg, S. M. (2015). Introduction, dispersal and naturalization of the Manila clam Ruditapes philippinarum in British estuaries, 1980–2010. Journal of the Marine Biological Association of the United Kingdom95(06), 1163-1172.
  • Bamber, R.N., Glover, R., Henderson, P.A. & Turnpenny, A.W.H. Diplostomiasis in the sand smelt, Atherina presbyter (Cuvier), population at Fawley Power Station. Journal of Fish Biology, 23,(2), 201-210.
  • Collins, K. J., Jensen, A.C. & Turnpenny, A.W.H., 1991. “The Artificial Reef Project, Poole Bay: A    fishery enhancement experiment.” Aquaculture and the Environment. European Aquaculture Society special publication 14, 74-75.
  • Lockwood, P., Jensen, A.C., Collins, K.J., Turnpenny A.W.H. 1991. The artificial reef in Poole Bay.  Ocean Challenge, 2,Autiunm 1991, 35-39.
  • Rosten, C., Horsfield, R., Anderson, K. & Turnpenny, A.W.H., 2010. Influences of Environmental Variables and Stocking on Atlantic Salmon Upstream Migrations in the River Thames, UK. In: (P. Kemp, ed.) Salmonid Fisheries: Freshwater Habitat Management. Chichester: Blackwell Publishing Ltd, pp. 296–306.
  • Turnpenny, A.W.H. et al., 1988. Factors limiting fish populations in the Loch Fleet system, an acidic drainage system in south-west Scotland. Journal of Fish Biology, 32(1), pp.101–118.
  • Turnpenny, A.W.H., Bamber, R.N. & Henderson, P.A., 1981. Biology of the sand‐smelt (Atherina presbyter Valenciennes) around Fawley power station. Journal of Fish Biology, 18 (4), 417-427.
  • Turnpenny, A.W.H., 1989. Field studies on fisheries in acid waters in the United Kingdom. In R. Morris et al., eds. Acid Toxicity and Aquatic Animals, SEB Seminar Series, 34. Cambridge University Press, pp. 45–65.
  • Turnpenny, A.W.H. et al., 1987. The fish populations of some streams in Wales and northern England in relation to acidity and associated factors. Journal of Fish Biology, 31(3), pp.415–434.
  • Turnpenny, A.W.H., 1983. Swimming performance of juvenile sprat, Sprattus sprattus L., and herring, Clupea harengus L., at different salinities. Journal of Fish Biology, 23(3), 321-325.
  • Turnpenny, A. W. H.,1990. The history of Loch Fleet fishery and fresh water quality for fish and aquatic fauna. In: (ed. Howells, G. & Dalziel, T.R.K) “Restoring acid waters: Loch Fleet”, 39-73.
  • Turnpenny, A. W. H.,1990. Alternatives to catchment liming. In: (ed. Howells, G. & Dalziel, T.R.K) “Restoring acid waters: Loch Fleet”, 173-98.
  • Turnpenny, A. W. H.,1990. Fisheries restoration after liming. In: (ed. Howells, G. & Dalziel, T.R.K) “Restoring acid waters: Loch Fleet”, 259-88.
  • Turnpenny, A. W. H., R. K. Schreiber, R. W. Brocksen, and D. B. Porcella. “Loch Fleet: fishery restoration after liming.” International lake and watershed liming practices. The Terrene Inst., Washington, DC (1991): 211-222.
  • Turnpenny, A.W.H. & Williams, R., 1977. Ebbw Fawr- a river restored. New Scientist, 73(1039), 388-390.
  • Turnpenny, A.W.H. & Williams, R., 1977. A River Restored. Steel Manager, April 1977, 25, 17-19.
  • Turnpenny, A.W.H. & Williams, R., 1982. A conductiometric technique for measuring the water velocity in salmonid spawning beds. Water Research, 16(9), 1383-1390.
  • Turnpenny, A.W.H. & Williams, R., 1981. Factors affecting the recovery of fish populations in an industrial river. Environmental Pollution Series A, Ecological and Biological, 26(1), pp.39–58.
  • Turnpenny, A. W.H., and C. S. Clough. “Physiological abilities of migrating fish.” Free Passage for Aquatic Fauna in Rivers and Other Water Bodies (2006), 12-24.
Fisheries Engineering and Power Generation:
  • Wright, G.V., Wright, R.M., and Kemp, P.S., 2014. Impact of tide gates on the migration of juvenile sea trout, Salmo trutta. Ecological Engineering 71, 615-622.
  • Wright, G.V., Wright, R.M., and Kemp, P.S. 2015. Impact of tide gates on the migration of adult European eels, Anguilla anguilla. Estuaries and Coasts 38, 2031-2043.
  • Wright, G.V., Wright, R.M., Bendall, B., Kemp, P.S., 2016. Impact of tide gates on the upstream movement of adult brown trout, Salmo trutta. Ecological Engineering 91, 495-505.
  • Bowen, M.D.,  T.W. Steig, S.V. Johnston, K.W. Clark, R.A. Horsfield, H. Marchant, B.T. Geske, J.G.    Romine, and C.W. Fitzer. 2016. The Effect of Three Agricultural Barriers on Migrating Anadromous Salmonid Juveniles in the Southern Portion of the Sacramento-San Joaquin River Delta. 9th Biennial Bay-Delta Science Conference, Sacramento, CA, USA
  • Turnpenny, A.W.H., 1998. Mechanisms of fish damage in low head turbines: An Experimental Appraisal M. Jungwirth, S. Schmutz, & S. Weiss, eds. Fish migration and fish bypasses, pp.300 – 314.
  • Nedwell J R, Turnpenny A W H (1995) ‘Acoustic fish guidance at water intakes‘. Proceedings of the Conference on Using Sound to Modify Fish Behaviour at Power-production and Water-control facilities, Portland, Oregon December 1995.
  • Turnpenny, A.W.H. & Horsfield, R.A., 2014. International Fish Screening Techniques A. W. H. Turnpenny & R. A. Horsfield, eds., WIT Press., 213 pp.
  • Wither, A., Bamber, R., Colclough S., Dyer, K., Elliott, M., Holmes, P., Jenner, H., Taylor, C. & Turnpenny, A., 2012. Setting new thermal standards for transitional and coastal (TraC) waters. Marine Pollution Bulletin 64 (2012) 1564–1579.
  • Nedwell J R, Turnpenny A W H (1998) ‘The application of underwater acoustics for the protection of fish at small hydroelectric stations’. Hidroenergia 5th International Conference and Exhibition, Sept 27th – Oct 1st, Dublin Ireland.
  • Lambert, D.R., Turnpenny, A.W.H. & Nedwell, J.R. (1997). The use of acoustic fish deflection systems at hydro stations. Hydropower & Dams, 1, 54-55.
  • Maes, J., Turnpenny, A.W.H., Lambert, D., Nedwell, J.R., Permentier, A. & Ollevier, F. (2004). Field evaluation of a sound system to reduce estuarine fish intake rates at a power station cooling water inlet. J. Fish Biol., 64, pp. 938-946.
  • Sheridan, S., Turnpenny, A.W.H., Horsfield, R.A. et al.., 2014. Screening at intakes and outfalls: measures to protect eel (Anguilla anguilla). In. (ed. Turnpenny, A.W.H. & Horsfield, R.A.) “International Fish Screening Techniques”, WIT Press, Ashurst, Southampton, UK, 3-15.
  • Bamber, R.N. & Turnpenny, A.W.H., 2012 Entrainment of organisms through power station cooling water systems. In: ”Operational and environmental consequences of large industrial cooling water systems”. Springer US, 2012. 339-352.
  • Bromley, R., Coyle, S., Hawley, K., Anderson, K. & Turnpenny, A.W.H., 2014. UK best practice screening trials study. . In. (ed. Turnpenny, A.W.H. & Horsfield, R.A.) “International Fish Screening Techniques”, WIT Press, Ashurst, Southampton, UK, 89-100.
  • Henderson, P.A., Turnpenny, A.W.H. & Bamber, R.N., 1985. Long-term stability of a sand smelt (Atherina presbyter Cuvier) population subject to power station cropping. Journal of Applied Ecology 21(1) (Apr., 1984), 1-10.
  • Turnpenny, A.W.H., Horsfield, R.A. &Willis, J., in press. Sea trout and tidal power: challenges and approaches. Proceedings of 2nd International Sea Trout Symposium, Dundalk, Ireland, October 2015.
  • Turnpenny, A.W.H. & Taylor, C.J.L., 2000. An assessment of the effect of the Sizewell power stations on fish populations. Hydroécologie Appliquée, 12, pp.87–134.
  • Turnpenny, A.W.H., 1981. An analysis of mesh sizes required for screening fishes at water intakes. Estuaries, 4(4):363-368.
  • Turnpenny, A.W.H. and Coughlan, J. (2003). Using Water Well: Studies of Power Stations and the Aquatic Environment. Monograph, Innogy plc, Swindon, UK, 142 pp.
  • Turnpenny, A.W.H. and Coughlan, J., 1992. Power generation on the British coast: thirty years of marine biological research. Hydroécol. Appl. 4(1), 1-11.
  • Turnpenny, A.W.H., 1983. Fish catches at Sizewell A Power Station. Porcupine Newsletter, 2(9), 238-242.
  • Turnpenny, A.W.H., 1985. Fish catches at Sizewell A Power Station. Porcupine Newsletter, 3(4), 94-98.
  • Turnpenny, A. W. H. “Operational and Environmental Effects of Fish Inundation in Cooling Water Systems and Best Practice Solutions.” Conference Proceedings, PowerGen Europe. 2008.
  • Turnpenny, A. W. H., 2014. Trials and tribulations of fish recovery and return. In. (ed. Turnpenny, A.W.H. & Horsfield, R.A.) “International Fish Screening Techniques”, WIT Press, Ashurst, Southampton, UK, 111-123.
  • Turnpenny, A.W.H., 1988. Fish impingement at estuarine power stations and its significance to commercial fishing. Journal of Fish Biology, 33 (Suppl. A), 103-110.
  • Turnpenny, A.W.H. and Hanson, K.P. (1997). Fish passage through small hydroturbines: theoretical, practical and economic perspectives. Proceedings of the Hidroenergia 97 conference, September 29th – October 1st, 1997, Dublin, Ireland, 451-463.
  • Turnpenny, A.W.H. & Everard, J.K., 1999. Can cavitation injure fish? In M. Odeh, ed. Innovations in Fish Passage Technology. Bethesda, Maryland: American Fisheries Society, pp. 197–205.
  • Turnpenny, A.W.H., Langford, T.E. & Aston, R.J..1985. Power stations and fish. CEGB Research ISSN 0305-7194,17, 27-39.
  • Turnpenny, A.W.H. and Taylor, C.J.L. (2000). An assessment of the effect of the Sizewell power stations on fish populations. Hydroecologie Applique, 12, 87-134.
  • Turnpenny, A.W.H., 1983. Multiple regression analysis for forecasting critical fish influxes at power station intakes. Journal of Applied Ecology, 20(1), 33-42.
Research & Design:
  • Nedwell J R, Turnpenny A W H (1998) ‘The use of a generic frequency weighting scale in estimating environmental effect’. Proceedings of the Workshop on Seismics and Marine Mammals, 23-25th June 1998, London, UK.
  • Nedwell J R, Turnpenny A W H, Lambert D (2002) ‘Guiding fish with sound, the acoustics of fish behavioural barrier design’. Proceedings of the American Fisheries Society 132nd Annual Meeting, 18¬22 August 2002, Hyatt Regency Hotel, Baltimore, USA.
  • Nedwell J R, Turnpenny A W H (1999) ‘The bioacoustic fish fence; fish guidance by evanescent sound’. 129th Annual Meeting of the American Fisheries Society Conference, Charlotte, North Carolina, USA August 1999.
  • Nedwell JR, Turnpenny AWH, Lovell JM, Edwards B (2006) An investigation into the effects of underwater piling noise on salmonids. Journal of the Acoustical Society of America 120: 2550–2554.
  • Nedwell J R, Turnpenny A W H (1996) ‘Acoustic deflection of downstream migrants‘. Proceedings of the International Conference on Fish Migration and Fish Bypass Channels, 24-26th September 1996, Vienna, Austria.
  • Nedwell J R, Lambert D, Turnpenny A W H (2003) ‘Objective design of acoustic fish deterrent systems’. Proceedings of the Symposium on Cooling Water Intake Technologies to Protect Aquatic Organisms, Environmental Protection Agency, May 6- 7, 2003. Hilton Crystal City at National Airport, Arlington, VA.
  • Bowen, M., Turnpenny, A.W.H. & Johnson, S. (2009). Testing of a non-physical barrier to improve escapement of Chinook smolts on the San Joaquin River in California’s Sacramento-San Joaquin Delta. (Ed. Dolben, I & Axford, S.). Proceedings of the Institute of Fisheries Management 40th Annual Conference, Stratford-upon-Avon, England.
  • Turnpenny, A.W.H., 1989. Impoundment and abstraction – exclusion of fish from intakes. In: “Water Schemes: the Safeguarding of Fisheries” (Ed. Gregory, J). Pitlochry, Atlantic Salmon Trust.
  • Amos C.L, Umgiesser G, Reed P, Munford G, Lea J. 2004. The residual tidal circulation of water, sediment and organics in northern Venice Lagoon, Italy. Scientific Research and Safeguarding of Venice. CORILA.
  • Turnpenny, A.W.H. & Williams, R., 1980. Effects of sedimentation on the gravels of an industrial river system. Journal of Fish Biology, 17(6), pp.681–693.

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