Characteristics of the rivers including catch statistics and numbers of escapees.

Years counted = numbers of years in which farmed salmon were counted in the river, % of farmed salmon = the mean percent of farmed salmon observed in these populations based upon the unweighted mean = average percentage of farmed salmon in spawning population in the period 1989–2009 [50], [51], weighed mean = weighted average percentage of farmed salmon in the population combining data from both sports-fishing and spawning population samples [52]; range for the unweighted mean refers to the lowest and maximum percentages of farmed salmon observed in the spawning populations (this also includes recordings with very low numbers of observations in some years [49]). Local stocking history and river catch in 2010 statistics Norway www.ssb.no, and 1990 [125];
Na = not available.
* = treated against Gyrodactylus salaris;
** = Norwegian zone;
*** = population collapse or strongly reduced;
smolt and parr stocking activity: <5000 : Low; 5–15000: Medium; >15000: High (eggs, alevins and fry converted to smolt numbers by calculating 10% survival); anadromous area available to smolts [49], and conservation attainment which is the average attainment of the conservation limit for each specific river as defined by the numbers of female salmon left in the river after fishing mortality in relation to the number of eggs required to achieve the rivers estimated carrying capacity [49].