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Warm water occupancy by North Sea cod.

Francis Neat¹, David Righton

¹Fisheries Research Services, Marine Laboratory, PO Box 101, 375 Victoria Road, Aberdeen AB11 9DB, UK. f.neat@marlab.ac.uk

Proceedings. Biological Sciences

|January 26, 2007

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North Sea warming impacts Atlantic cod (Gadus morhua L.) distribution. Despite warmer waters, most adult cod did not migrate to cooler areas, suggesting limited adaptation to the changing thermal environment.

Area of Science:

Marine biology
Fisheries science
Oceanography

Background:

The North Sea is experiencing warming, prompting research into its effects on marine life.
Atlantic cod (Gadus morhua L.) populations have significantly declined in the North Sea over the last two decades.
Understanding fish distribution shifts in response to climate change is crucial for fisheries management.

Purpose of the Study:

To investigate whether Atlantic cod occupy their full available thermal habitat in the North Sea.
To assess if cod behavior changes in response to rising sea temperatures.
To determine if cod are adapting to the warming North Sea environment.

Main Methods:

Electronic tagging of 129 individual Atlantic cod in the North Sea from 1999 to 2005.

Related Experiment Videos

Comparison of individual cod's experienced temperatures with contemporaneous, independently measured sea-bottom temperatures.

Analysis of cod distribution patterns relative to thermal gradients.

Main Results:

The majority of tagged cod experienced warmer sea temperatures than were potentially available.
In summer, many southern North Sea cod encountered temperatures exceeding optimal levels for growth.
While some cod demonstrated the capacity to move to cooler waters, most did not.

Conclusions:

Adult Atlantic cod in the North Sea are not fully utilizing their available thermal habitat.
Current behavioral responses suggest that adult cod are not yet migrating to cooler waters to escape warming conditions.
The observed thermal experience of cod indicates a potential mismatch with optimal conditions, possibly contributing to population declines.