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Perspectives on Escapement
There are different perspectives on salmon escapements. Perspectives of managers are based on estimates of the total number of salmon entering the river and then the cross border escapement to Canada. The estimates are used to make decisions on openings for the fisheries. Fisher’s perspectives will mainly be based on the number and condition of the salmon they catch. Their perspectives may also be based on long term local experience and oral tradition. This may include periods of abundance and scarcity. This may cause a difference in perception of escapement between managers and fishers.
The fishery manager’s perspective of escapement may be based on achieving the greatest number of returning adults from the lowest numbers of fish allowed to spawn (maximum sustainable yield). They do this from estimates of salmon spawning and calculations of how many salmon will be produced from each salmon that spawns. Generally, lower numbers of spawners produce more adults than very high numbers of spawners. However environmental conditions and ecosystem needs are not considered. Fishers’ perspective of escapement is usually based on having sufficient spawners to ensure the safety of the salmon run and the fishery under all environmental conditions.