Abstract
This paper reviews the studies undertaken to determine the relationship between hypoosmoregulatory performance in the 24-h seawater challenge test and marine survival of hatchery-reared coho salmon and steelhead trout juveniles. The results of sampling various salmonids in southwestern British Columbia are discussed in terms of potential utility of the challenge test in relation to increasing the efficiency of hatchery production. Although some individuals of all salmonid species tested exhibit a similar high level of hypoosmoregulatory performance in the challenge test, the size at which this development appears varies widely among species. Sampling of juveniles from structured release experiments in production hatcheries has revealed temporal and size-related differences in the pattern of development. Once the information on rate of survival of these release groups is available, it is anticipated that particular levels of performance can be interpreted in relation to species and locale.
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