- PhD (Zoology). University of Canterbury, 1984
- BSc (Hons, Zoology). University of Canterbury, 1979
Role at Cawthron
John is a senior scientist in the Coastal and Freshwater Group and is responsible for managing freshwater fisheries and ecohydraulics research and consulting programmes.
Technical skills, experience and interests
- Recreational trout and salmon fisheries
- In-stream habitat modelling with the in-stream flow incremental methodology (IFIM) and with process-based models
- Native fish ecology and distribution modelling
- A bioenergetics-based whole-lifetime growth model for trout
- World-leading process-based models integrating river hydraulics, invertebrate drift dispersion, bioenergetics-based trout growth and carrying capacity
- Best paper in Transactions of the American Fisheries Society award in 2001 for a paper on a whole-lifetime bioenergetics growth model for drift-feeding brown trout
- Communication of fisheries and ecohydraulics science to the public
- Regular contributor to Fish and Game New Zealand magazine
- Co-authored 'The Artful Science of Trout Fishing' with Les Hill, acclaimed fishing photographer
- New Zealand Freshwater Sciences Society
- American Fisheries Society
View John's ResearchGate profile
- Hayes JW, Goodwin E, Shearer KA, Hay J and Kelly L 2016. Can WUA correctly predict the flow requirements of drift-feeding trout. Transactions of the American Fisheries Society. Volume 145, Issue 3, 2016. Pages 589-609.
- Hayes JW, Hay J, Maxwell I and Quarterman A 2015. Estimating trout abundance with cataraft-mounted dual-frequency identification sonar: a comparison with drift diving. North American Journal of Fisheries Management 35: Pages 528-536.
- Shearer KA, Hayes JW, Jowett IG and Olsen DA 2015. Habitat suitability curves for benthic macroinvertebrates from a small New Zealand river. New Zealand Journal of Marine and Freshwater Research. Published online 21 Jan 2015.
- Holmes R, Hayes JW, Jiang W, Quarterman A and Davey LN 2014. Emigration and mortality of juvenile brown trout in a New Zealand headwater tributary. Ecology of Freshwater Fish. Volume 23, Issue 4, 631–643.
- Hayes JW, Hay J, Goodwin E, Hughes N and Kelly L 2014. Invertebrate drift and salmonid foraging models.
- Hayes JW, Shearer KA, Goodwin E, Hay J, Allen CA, Olsen DA and Jowett IG 2014. Test of a benthic macroinvertebrate habitat – flow time series model incorporating disturbance and recovery processes. Rivers, Research and Applications. Article first published online: 14 May 2014.
- Piccolo JJ, Frank BM and Hayes JW 2014. Food and space revisited: The role of drift-feeding theory in predicting the distribution, growth, and abundance of stream salmonids. Environmental Biology of Fishes 97(5): 475-488.
- Olsen DA, Hayes JW, Booker DJ and Barter PJ 2014. A model incorporating disturbance and recovery processes in benthic invertebrate habitat-flow time series. River Research and Applications 30(4): 413-426.
- Hayes JW, Olsen DA and Hay J 2010. The influence of natural variation in discharge on juvenile brown trout population dynamics in a nursery tributary of the Motueka River, New Zealand. New Zealand Journal of Marine and Freshwater Research 44: 247-270.
- Hayes JW, Hughes NF and Kelly LH 2007. Process-based modeling of invertebrate drift transport, net energy intake and reach carrying capacity for drift-feeding salmonids. Ecological Modelling 207(2-4): 171-188.
- Hughes NF, Hayes JW, Shearer KA and Young RG 2003. Testing a model of drift-feeding using a 3D videography of wild brown trout in a New Zealand river. Canadian Journal of Fisheries and Aquatic Sciences 60: 1462-1476.
- Hayes JW, Stark JD and Shearer KA 2000. Development and test of a whole lifetime foraging and bioenergetics model for drift-feeding brown trout. Transactions of the American Fisheries Society 129: 315- 332.