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Tracing growth patterns in cod (Gadus morhua L.) using bioenergetic modelling.

Steffen Funk1, Nicole Funk1, Jens-Peter Herrmann1

  • 1Institute of Marine Ecosystem and Fishery Science, Centre for Earth System Research and Sustainability (CEN) University of Hamburg Hamburg Germany.

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Summary

A new bioenergetic model for Western Baltic cod (Gadus morhua) accurately simulates growth. This model explains how warming waters negatively impact cod growth, offering insights for fisheries management.

Keywords:
Baltic Seabioenergetic modellingclimate changecodfish growth

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Area of Science:

  • Fisheries Science
  • Ecosystem-based Management
  • Climate Change Impact

Background:

  • Accurate fish growth estimation is vital for fisheries management.
  • Traditional methods like otolith readings and tag-recapture have limitations.
  • Bioenergetic modeling offers an alternative for understanding fish growth dynamics.

Purpose of the Study:

  • To develop an individual-based bioenergetic model for Western Baltic cod (Gadus morhua).
  • To investigate the effects of environmental changes, particularly warming, on cod growth.
  • To provide insights into climate change impacts on commercially important fish species.

Main Methods:

  • Developed an individual-based bioenergetic model for Western Baltic cod.
  • Integrated in-situ data on spatial distribution and feeding behavior.
  • Incorporated laboratory-derived physiological data (gastric evacuation, consumption, etc.).

Main Results:

  • The model successfully reproduced observed seasonal growth patterns in the field.
  • The model explained the detrimental effects of summer heat periods on cod growth.
  • Simulations highlighted a mechanism for climate change-induced growth reduction.

Conclusions:

  • Bioenergetic modeling is a reliable tool for assessing fish growth and environmental impacts.
  • Warming waters pose a significant threat to Western Baltic cod growth.
  • Findings have implications for managing similar fish populations in changing climates.