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Published 27.02.2017 - Updated 27.02.2017

Gear selectivity as a key to evolutionarily enlightened management?

As trade-offs are inevitable among the objectives in fisheries management, the maximization of yield from a fishery is traditionally considered to be in conflict with the mitigation of its evolutionary impacts. However, this perspective focuses mostly on fishing mortality alone, whereas modern fisheries management often neglects the role of gear selectivity. In a new study published in Marine Ecology Progress Series, ConEvolHer members Fabian Zimmermann and Christian Jørgensen investigated in Northeast Arctic cod how fishing gear and size selective fishing affects population dynamics, catch and potential trade-offs between management objectives.

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Published 02.02.2017 - Updated 02.02.2017

ConEvolHer represented with a theme session at the ICES ASC 2017

At this year’s ICES Annual Science Conference in Fort Lauderdale, Florida, ConEvolHer will be present with its own session.  Session P on recruitment dynamics in a changing environment takes up one of the project’s key question, the drivers of recruitment variability and impacts on stock assessment and management. The session will be convened by ConEvolHer members Katja Enberg and Fabian Zimmermann together with LaTreese Denson (USA). The call for abstracts is now open!

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Published 06.01.2017 - Updated 06.01.2017

New mark-recapture program of Norwegian spring-spawning herring launched

Over the course of three weeks in the last months of 2016, scientists from the Institute of Marine Research (IMR) including ConEvolHer member Fabian Zimmermann marked several thousand Atlantic herring (Clupea harengus) in Kaldfjord near Tromsø, Norway. This represents the launch of a new mark-recapture program for Norwegian spring-spawning herring after the previous one was ceased in 2007, and will provide helpful information about stock size and natural mortality that can help to improve future stock assessments.

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Published 11.08.2016 - Updated 11.08.2016

Can less be more? New ConEvolHer article on stock assessment uncertainty

ICES Journal of Marine Science published an article by ConEvolHer members Fabian Zimmermann and Katja Enberg on the impact of assessment and survey frequency for stock estimates and uncertainty. The study shows that considering the prevailing overall high assessment uncertainty, reducing the assessment or survey frequency may not necessarily decrease the quality of stock estimates and could therefore be considered as a possibility to lower the costs of stock assessment.

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