Abstract
1.1. Oxygen conductance values were estimated for spontaneously active encapsulated embryos of chinook (Oncorhynchus tshawytscha), coho (O. kisutch), chum (O. keta), pink (O. gorbuscha) and sockeye (O. nerka) salmon, and steelhead trout (Salmo gairdneri) from relationships between critical oxygen tension and routine metabolic rate.2.2. Total conductance (G) varied significantly among species (range 1.056-2.083 × 10−3 nmol/[Torr.sec]) and was highly correlated with capsule surface area (A).3.3. Area-specific conductance (g/a) however, varied little (range 0.746-1.059 × 10−3nmol/ [Torr·sec·cm2]) and was not significantly correlated with any obvious structural characteristic of the capsule.4.4. This is surprising, given the variation in capsule structure, and suggests that the direct influence of the capsule on overall conductance is relatively small.
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