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Showing papers by "Atlantic Salmon Federation published in 2020"


Journal ArticleDOI
TL;DR: In this paper, the authors used thermal infrared (TIR) imagery to map cold water anomalies along a 53 km reach of the Cains River, New Brunswick, and found that trout use thermal anomalies as refugia during higher river temperature periods (>21°C).
Abstract: Anthropogenic influences, including climate change, are increasing river temperatures in northern and temperate regions and threatening the thermal habitats of native salmonids. When river temperatures exceed the tolerance levels of brook trout and Atlantic salmon, individuals exhibit behavioural thermoregulation by seeking out cold‐water refugia – often created by tributaries and groundwater discharge. Thermal infrared (TIR) imagery was used to map cold‐water anomalies along a 53 km reach of the Cains River, New Brunswick. Trout and salmon parr did not use all identified thermal anomalies as refugia during higher river temperature periods (>21°C). Most small‐bodied trout (8–30 cm) were observed in 80% of the thermal anomalies sampled. Large‐bodied trout (>35 cm) required a more specific set of physical habitat conditions for suitable refugia, that is, 100% of observed large trout used 30% of the anomalies sampled and required water depths >65 cm within or adjacent to the anomaly. Densities of trout were significantly higher within anomalies compared with areas of ambient river temperature. Salmon parr were less aligned with thermal anomalies at the observed temperatures, that is, 59% were found in 65% of the sampled anomalies; and densities were not significantly different within/ outside anomalies. Salmon parr appeared to aggregate at 27°C, and after several events over 27°C variability in aggregation behaviour was observed – some fish aggregated at 25°C, others did not. We stipulate this is due to variances of thermal fatigue. Habitat suitability curves were developed for velocity, temperature, depth, substrate, and deep water availability to characterize conditions preferred by fish during high‐temperature events. These findings are useful for managers as our climate warms, and can potentially be used as a tool to help conserve and enhance thermal refugia for brook trout and Atlantic salmon in similar systems.

32 citations


Journal ArticleDOI
23 Jun 2020
TL;DR: The recreational fishing sector is the dominant freshwater fisheries sector in much of the world as discussed by the authors, and millions of individuals worldwide rely on recreational fishing activities for leisure, food, and employment.
Abstract: Millions of individuals worldwide rely on recreational fishing activities for leisure, food, and employment Recreational fishing is the dominant freshwater fisheries sector in much of the highly d

20 citations


Journal ArticleDOI
23 Apr 2020
TL;DR: Infectious agents are key components of animal ecology and drivers of host population dynamics and knowledge of their diversity and transmission in the wild is necessary for the management and conserv... as discussed by the authors.
Abstract: Infectious agents are key components of animal ecology and drivers of host population dynamics. Knowledge of their diversity and transmission in the wild is necessary for the management and conserv...

12 citations


Journal ArticleDOI
TL;DR: This study examined the migratory patterns of introduced rainbow trout in three rivers in Prince Edward Island, Canada, using acoustic telemetry and otolith microchemistry.
Abstract: This study examined the migratory patterns of introduced rainbow trout (Oncorhynchus mykiss) in three rivers in Prince Edward Island, Canada, using acoustic telemetry and otolith microchemistry. On...

6 citations


Journal ArticleDOI
TL;DR: The results show that stocked landlocked YOY Atlantic salmon use similar habitats to anadromous populations and may help managers when determining stocking locations or habitat alterations.

1 citations