Showing papers by "Atlantic Salmon Federation published in 2021"
39 citations
Swedish University of Agricultural Sciences1, Fisheries and Oceans Canada2, Agrocampus Ouest3, Natural Resources Institute Finland4, Centre for Environment, Fisheries and Aquaculture Science5, Game & Wildlife Conservation Trust6, Marine Scotland7, North Atlantic Salmon Conservation Organization8, Marine Institute of Memorial University of Newfoundland9, Atlantic Salmon Federation10, National Marine Fisheries Service11
6 citations
TL;DR: In this article, the authors investigate displacement behavior among inshore fishing guides based on a contextual self-classification measure reflecting guides' style of participation and find that the least specialized guide type (Limit Guides) substituted SST for an alternative species more often than All-purpose Guides during the 2010 calendar year.
3 citations
2 citations
TL;DR: The hatchery effect increased migration rate whereas short recovery times and captivity in a hatchery negatively affected survival, and migration speed was faster for hatchery smolts but is likely only due to their larger size.
Abstract: The experimental effects of surgically implanting fish with acoustic transmitters are likely to have negative effects on survival and behaviour. Measuring the extent of these negative effects is important if we wish to extrapolate inferences from tagged animals to un-manipulated animals. In this study, we examine the effect of surgery and post-tagging recovery time on the survival and migration rate of acoustically tagged wild Atlantic Salmon (Salmo salar) smolts through freshwater, estuarine and ocean phases of migration. Four treatment groups were used: pre-smolt captured in the fall that overwintered in a hatchery and were tagged either 75 days prior to release (winter hatchery) or within 24 h prior to release (spring hatchery) and smolt captured during the spring smolt run, tagged 24 h prior to release and released during the day (day-released) or night (night-released). The spring hatchery treatment group served as a reference treatment group such that recovery time (comparison to winter hatchery treatment) and hatchery effects (comparison to day-released and night-released treatments) could both be discerned. The hatchery effect increased migration rate, whereas short recovery times and captivity in a hatchery negatively affected survival. These effects were most pronounced within the first 5 days and/or 48 km downstream post-release, however, the residual recovery time effects appeared to persist during the transition from the estuary into salt water. Even with smolts originating from the wild and spending relatively little time within the hatchery environment, post-release survival was still negatively affected. Migration speed was faster for hatchery smolts, but is likely only due to their larger size. Recovery time effects were most prominent during the initial migration period in freshwater and again in the transition from the estuary to saltwater which may be due to added stress during these transitional zones. As surgery-related bias will likely never be completely removed from telemetry studies, it is important to quantify and account for these effects in situ when making inferences on the un-manipulated component of the population.
2 citations