Osmoregulatorily

Both are osmoregulatorily active areas, and an external position and/or enlargement will be of competitive advantage in a life in diluted brackish or freshwater.

Fish from Early Summer-runs would (1) have higher somatic energy reserves, (2) be more reproductively advanced and (3) be more osmoregulatorily 'prepared' for freshwater entry than Later Summer-runs.

The initial muscle lesions formed during the breakdown of the plasmodial wall may have made the fish osmoregulatorily imbalanced and opened the corridors as mini-scars (pathecia) for secondary infections.