- It is current practice to transport juvenile anadromous salmonids in transplantation and to help them bypass dams. Essentially nothing is known about the effects that transportation could have on the ability of the fish to outmigrate and be fit for survival in the marine environment. Procedures involved in transporation subject the fish to severe handling, confinement and crowding.
The primary responses to handling and confinement, as perhaps incurred by fish during transportation, include increased levels of circulating catecholamines (Mazeaud et al. 1977) and corticosteroids (Mazeaud et al. 1977; Strange et al. 1977; Strange et al. 1978). Secondary effects of handling include fluctuations in blood chemistry, such as hyperglycemia, and indications of osmoregulatory dysfunction (Wedemeyer 1972). Such physiological changes in transported fish could alter their capacity to tolerate any second stress (e.g., those encountered after liberation into the wild) or alter their ability to adjust to direct entry into seawater.
The goal of this study was to advance understanding that would maximize hatchery salmonid production.