Maintaining diverse habitats and salmon runs may allow ecosystems and fisheries to continue to thrive amidst these changes. Some fishing communities harvest a diverse portfolio of fluctuating resources, whereas others have specialized over time, potentially limiting their resilience. Lowland salmon streams are especially vulnerable, but retreating glaciers may allow production gains in other streams. This environmental transformation will likely harm some salmon populations while benefiting others. The landscape is also changing, with melting glaciers, wetland loss, wildfires, and human development. The region is warming and experiencing drier summers and wetter autumns. tshawytscha populations have declined, raising concerns about their future resilience. We focused on the Kenai River, which supports world-famous fisheries but where Chinook Salmon O. We examined changes in climate, hydrology, land cover, salmon populations, and fisheries over the past 30–70 years in this region. Between these geographic extremes, in the Gulf of Alaska region, salmon are at historically high abundances but face an uncertain future due to rapid environmental change. Conversely, climate warming appears to be allowing salmon to expand northwards into the Arctic. face serious challenges from climate and landscape change, particularly in the southern portion of their native range. The large number of strayers identified in Silverstream may be a consequence of the geomorphology of the Taieri catchment and highlights the adaptability of brown trout to different environmental contexts. Contrary to published studies based on wild populations of brown trout in Europe, and several other species of salmonids, a large proportion of brown trout spawners collected in Silverstream were strays. Another 14 fish likely originated from other Taieri tributaries further upstream, but the origin of the remaining 10 could not be determined. The results showed that only six from a sample of 30 spawning adults in Silverstream originated from Silverstream. We used linear discriminant function analysis to compare the trace element composition in the otoliths of YoY (young‐of‐the‐year) trout collected at spawning streams across the catchment and adult trout reproducing in Silverstream. To examine brown trout homing and straying in a river catchment, otolith microchemical analysis was applied. The data on natal homing and straying are important for the understanding of the ecological resilience of salmonid populations and metapopulations, and the development of effective management measures at stream or catchment scales. This study aimed to estimate the relative importance of straying and homing in introduced brown trout Salmo trutta spawning in a model coastal tributary (Silverstream) of a large New Zealand river using otolith microchemistry. Straying has evolutionary and ecological importance for species flexibility, interpopulation connectivity and success of invasive species in new environments. Natal homing and straying are behavioural tactics of migratory animals that return to nursery habitats to breed as adults. The broodstock, if our results are due, at least in part, to homing of Wild-origin fish and increase the proportion of wild-origin fish in Will reduce the proportion of hatchery-origin fish spawning with Spawning areas and the hatchery broodstock collection site That releasing hatchery fish at a new location removed fromthe primary Of hatchery-origin fish used for brood is also larger than desirableīecause the site is also the broodstock collection site. Spawning with natural-origin fish at the release site. In a larger-than-desirable proportion of hatchery-origin fish Is consistent with homing to specific siteswithin the lake of either orīoth hatchery- and wild-origin fish. Nonrandom distribution of hatchery-origin spawners. Of the fish at the release site were hatchery-origin fish, indicating a Of 58% of the fish returning to the lake through a weir on the The hatchery collects broodstock from the lake and releasesįry with thermally marked otoliths at one of two primary natural Production in Hidden Lake is limited by theĪvailability of spawning habitat and not by juvenile rearing capacity. Trail Lakes Hatchery supplements the natural population with

In this study, we focus on stock enhancement Maximizing the number of natural-origin fish in the supplementationīroodstock. The number of hatchery fish spawning with natural-origin fish and Two such challenges addressed in this study are limiting with hatchery fish poses unique managementĬhallenges. The supplementation of natural populations of Pacific salmon

Hidden lake alaska