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Fisheries Ecology and Aquaculture

Research at Fisheries Ecology and Aquaculture

Our vision: Increase our understanding of population dynamic mechanisms within and between fish populations in relation to the environment, ecosystem, and provide the basis for ecosystem based management.

Newly hatched cod larvae

Nylig klekket torsk larver
Newly hatched cod larva

The members of the research group cover research from the organism level to the population and ecosystem levels with theoretical, experimental, and field oriented approaches. The activity links findings from controlled laboratory experiments with observed responses under natural field conditions and full scale culture conditions. Mesocosms are used as a suitable experimental level to link the understanding of processes determined in the laboratory with those prevailing under natural conditions.

The group is also actively involved in development of methodology and tools for studies at individual and population level and methodology to monitor habitats, populations and studies of the impact of fishing on biodiversity.

The research group focuses on processes influencing fish growth, reproduction, recruitment and their interactions with other organisms and the ambient environment. Growth is considered a central biological process interacting with condition as a measure of individual well-being. At the same time growth is an integrating process characterising individuals which can be used to increase the information at the individual and population level.

 

Topics that are covered by the research group are:

Individual and population level:

  • Density-dependent growth and mortality
  • Size- and temperature-dependent growth
  • Environmental and ontogenetic effects on otolith growth and composition
  • Growth and condition-dependent mortality risk
  • Stage-dependent energy allocation
  • Life history strategies
  • Parental effects
  • Phenotypical plasticity, metamorphosis and the transition from larva to juvenile,
  • Hormonal responses towards environment and diet

Population and ecosystem level:

  • Theoretical basis for fish population dynamics
  • Stock interactions
  • Environmental influences on stock dynamics
  • Ecosystem effects of fishing
  • Effects on production and structure in populations and ecosystems
  • Stock level effects due selection properties of new gear types
  • Effects on ecosystem biodiversity and species biodiversity
  • Evolutionary effects (genetic selection)
  • Methods for monitoring
  • State indicators
  • Principles for ecosystem-based management