WP 1: Mechanisms of changes in stock structure and reproductive potential

young cod (Gadus morhua); Foto and Copyright©: Daniel Stepputtis, Rostock (Germany)

Workpackage 1 is directed towards understanding traits and mechanisms of changes in stock distribution, biology, and reproductive potential, genetic structure and evolutionary effects of fishing. The approach is to initially collate and review all the available information on the target species, by regional sea in order to establish time series of empirical data that can be applied in process models and stock reproductive potential estimates to be used by other workpackages.


  1. Develop process models to predict immature fish growth and maturation, and seasonal reproductive investment of adults considering abiotic and biotic factors that affect energy allocation, atresia and spawning omission.
  2. Review and evaluate egg quality and viability of offspring under differing stock structures depending on maternal characteristics and environmental factors.
  3. Establish models capturing variability in stock reproductive potential under varying stock size, demography and environmental conditions.
  4. Review and model the available genetic information on natural changes in effective population sizes, selective changes in life history/morphology and physiology and changes in genetic isolation between populations caused by human intervention.
  5. Evaluate and model fishery-induced evolution in the target fish stocks and the implications for recovering fish stocks.
  6. Examine and model the known distribution and migration patterns of the target species under high and low stock sizes and evaluate the consequences of changes in environmental conditions during periods of stock recovery

Read more: Description of work in WP 1