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Tom Clegg

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Telefon: 94143011
Avdeling: Fiskeridynamikk

I am a PhD candidate in quantitative fisheries biology, estimating unreported bycatch and discards in Norwegian fisheries. The project is a partnership between IMR and the Norwegian Directorate of Fisheries, under the supervision of Dr Kjell Nedreaas (IMR) and Dr Geir Blom (FDir).

The modern movement towards ecosystem-based fisheries management requires increased knowledge on all extractions from a fishery, further than just the target species. However, there are still many sources of unreported catches such as misreporting, insufficient detail in reported catches, and discarding. If such unreported catches can be quantified, we can improve the accuracy of stock assessments and our understanding of ecosystem interactions in the fisheries.

My project aims to develop a fishery-adapted methodology for quantifying unreported catches of commercial and non-commercial species in Norwegian fisheries. The estimates will help determine contributions to the total fishing mortality and also be used to assess the possible effects that bycatch and discards may have on the ecosystem.

Curriculum Vitae

I received an M.Sc. in Marine Environmental Protection from Bangor University in 2014, where I studied the effect of increased suspended sediment concentrations on the reef-forming horse mussel, Modiolus modiolus in relation to scallop dredging, and specialised in courses on fisheries science.

After graduating, I volunteered with various marine conservation charities in the UK, working on topics such as science communication, invasive species and marine plastics. In 2015 I joined one of the UK’s regional inshore marine regulators where I was responsible for the designation and management of a fisheries no-take zone to protect inshore nursery areas for local commercial fish species. The project ran in close partnership with the local fishermen’s organisation to draft legislation and create a long-term management plan.


Vitenskapelige artikler (NVI)


Recruitment regime shifts and nonstationarity are widespread phenomena in harvestable stocks experiencing pronounced climate fluctuations

Shuyang Ma, Geir Huse, Kotaro Ono, Richard David Marriott Nash, Anne Britt Sandø, Kjell Harald Nedreaas, Solfrid Sætre Hjøllo, Svein Sundby, Thomas L Clegg, Jon Helge Vølstad, Olav Sigurd Kjesbu
Fish and Fisheries

Workshop to evaluate the utility of industry-derived data for enhancing scientific knowledge and providing data for stock assessments (WKEVUT; outputs from 2022 meeting)

Clegg, Tom
ICES Scientific Reports

Evaluating assumptions behind design-based estimators for unreported catches

Thomas L Clegg, Edvin Fuglebakk, Kotaro Ono
Fisheries Research 263

Discards of cod (Gadus morhua) in the Norwegian coastal fisheries: Improving past and future estimates

Hilde Sofie Fantoft Berg, Tom Clegg, Geir Blom, Jeppe Kolding, Kotaro Ono, Kjell Harald Nedreaas
ICES Journal of Marine Science 79 p. 1548-1560

A simulation approach to assessing bias in a fisheries self-sampling programme

Tom Clegg, Edvin Fuglebakk, Kotaro Ono, Jon Helge Vølstad, Kjell Harald Nedreaas
ICES Journal of Marine Science

Applying global best practices for estimating unreported catches in Norwegian fisheries under a discard ban

Thomas L Clegg, Steven J. Kennelly, Geir Blom, Kjell Harald Nedreaas
Reviews in Fish Biology and Fisheries 31 p. 1-23

Faglige foredrag


The Norwegian Reference Fleet - Lessons Learned

Clegg, Thomas

The Norwegian Reference Fleet - a trust-based collaboration

Clegg, Thomas L

Estimating unreported catches in Norwegian fisheries

Clegg, Thomas L

Assessing representativeness and bias in Norwegian commercial catch sampling programs conducted in collaboration with the industry.

Edvin Fuglebakk, Håkon Magne Otterå, Thomas L Clegg, Gjert E. Dingsør, Jon Helge Vølstad



Accounting for more uncertainty in discard estimators

Thomas L Clegg, Fantoft Berg Hilde Sofie, Nedreaas Kjell, Blom Geir, Kolding Jeppe, Ono Kotaro

The Norwegian Reference Fleet - Feedback from participants and user groups

Tom Williams, Sofie Gundersen, Thomas L Clegg

Estimating unreported bycatch and discards in Norwegian fisheries under a discards ban

Thomas Clegg, Kjell Harald Nedreaas, Geir Blom

Rapporter og avhandlinger


Estimating the size distribution of reported catches on-board factory vessels – Issues with using data from the production process

Thomas L Clegg, Geir Blom, Kotaro Ono, Kjell Harald Nedreaas

Monitoring bycatches in Norwegian fisheries — Species registered by the Norwegian Reference Fleet 2015-2018

Thomas Clegg, Tom Williams
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