US Army Corps of Engineers
Portland District Website Website


Conceptual model diagramSalmonid production refers to the growth and survival of salmon, especially juveniles.


The figure at bottom left is a conceptual diagram showing the factors contributing to the productive capacity of wild subyearling salmon in the the Columbia River estuary (Simenstad 2001).


The figure at bottom right shows that salmon performance within the estuary is directly linked to population structure upriver, habitat opportunity, and habitat capacity.


Hatchery releases, salmon harvest, and watershed modifications alter population structure and also may affect patterns of salmon rearing and migration in the estuary (Bottom et al. 2001).

Conceptual model diagram


Processes that affect salmonid production:

  • Food web support
  • Primary production
  • Refuge
  • Reproduction
  • Successional development


Interactions and equations:

Contact information

Ronald Thom, Ph.D

Marine Research Operations, PNNL
1529 W. Sequim Bay Rd.
Sequim, WA 98382