Gustav Hellström
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View article: Impacts of an anxiolytic drug on fish behaviour and habitat use in a natural landscape
Impacts of an anxiolytic drug on fish behaviour and habitat use in a natural landscape Open
Pharmaceutical contaminants reaching natural aquatic ecosystems can affect fish behaviour, modifying activity patterns, foraging behaviour and antipredator responses. While laboratory-based studies can offer key insights, assessing the eco…
View article: Wild and Naturalized Hatchery Brown Trout: A Comparison of Movement, Space Use, and Survival in a Large Lake
Wild and Naturalized Hatchery Brown Trout: A Comparison of Movement, Space Use, and Survival in a Large Lake Open
Most research comparing wild and hatchery‐produced fish focuses on recently stocked individuals. As a result, these studies only investigate the behavior of naive hatchery fish, leaving a knowledge gap regarding long‐term survivors. We com…
View article: The genome sequence of Atlantic Bluefin Tuna, Thunnus thynnus (Linnaeus, 1758)
The genome sequence of Atlantic Bluefin Tuna, Thunnus thynnus (Linnaeus, 1758) Open
We present a genome assembly from a specimen of Thunnus thynnus (Atlantic Bluefin Tuna; Chordata; Actinopteri; Scombriformes; Scombridae). The genome sequence has a total length of 799.05 megabases. Most of the assembly (99.17%) is scaffol…
View article: Two‐Year Spawning Migration as a Life‐History Strategy of Sea Trout (<scp><i>Salmo trutta</i></scp> L.) in Large, High‐Latitude River Systems
Two‐Year Spawning Migration as a Life‐History Strategy of Sea Trout (<span><i>Salmo trutta</i></span> L.) in Large, High‐Latitude River Systems Open
Migrating animals are found throughout the animal kingdom, as movement between habitats can be vital for survival, growth, and reproduction. Mature sea trout ( Salmo trutta L.) undertake seasonal migrations from marine feeding areas to fre…
View article: The role of habitat in predator–prey dynamics with applications to restoration
The role of habitat in predator–prey dynamics with applications to restoration Open
Habitat is a powerful force in ecosystems, and the quantity and quality of habitat can shape ecosystem structure and function. Among the many important roles that habitat plays is as a mediator of ecological interactions, including predato…
View article: Effect of internal tagging on egg viability of steelhead
Effect of internal tagging on egg viability of steelhead Open
Objective Acoustic and radio tagging has been used extensively to study movement patterns of fish in marine and freshwater environments and often relies on internal tagging. Intracoelomic implantation of tags in fish requires the surgeon t…
View article: Psychoactive pollutant alters movement dynamics of fish in a natural lake system
Psychoactive pollutant alters movement dynamics of fish in a natural lake system Open
Pharmaceutical pollution poses an increasing threat to global wildlife populations. Psychoactive pharmaceutical pollutants (e.g. antidepressants, anxiolytics) are a distinctive concern owing to their ability to act on neural pathways that …
View article: A Delphi‐study to identify drivers of future angling participation in five Nordic countries
A Delphi‐study to identify drivers of future angling participation in five Nordic countries Open
The Delphi method was used to gather assessments from 93 experts about drivers of future angling participation by locals and tourist anglers in Denmark, Finland, Iceland, Norway, and Sweden. The main drivers of future angling participation…
View article: Challenges in downstream dam passage and the effect of dam removal on <scp>A</scp>tlantic <scp>s</scp>almon (<scp><i>Salmo salar</i></scp>) smolt migrations
Challenges in downstream dam passage and the effect of dam removal on <span>A</span>tlantic <span>s</span>almon (<span><i>Salmo salar</i></span>) smolt migrations Open
Migration is critical for life‐cycle completion in diadromous fish species. River connectivity is vital in facilitating these large‐scale movement events, but the extent of present‐day river fragmentation can interfere with these migration…
View article: Indications of reproductive disturbance by the invasive round goby on a native salmonid
Indications of reproductive disturbance by the invasive round goby on a native salmonid Open
Invasive species have a wide array of effects on species in their introduced ranges, including sub-lethal effects such as disruption of courtship or parental care, with potential negative influence on fitness of the native species. The inv…
View article: Lake survival of hatchery‐reared adfluvial brown trout—A case study in a large natural lake in Sweden
Lake survival of hatchery‐reared adfluvial brown trout—A case study in a large natural lake in Sweden Open
Throughout their native range, adfluvial brown trout populations have declined due to habitat degradation and over exploitation. As a consequence, numerous restoration projects that include stocking of hatchery‐reared trout have been condu…
View article: Anadromous trout from opposite sides of the globe: biology, ocean ecology, and management of anadromous brown and cutthroat trout
Anadromous trout from opposite sides of the globe: biology, ocean ecology, and management of anadromous brown and cutthroat trout Open
Anadromous brown trout ( Salmo trutta ) in the northeastern Atlantic Ocean, and coastal cutthroat trout ( Oncorhynchus clarkii clarkii ) in the northeastern Pacific Ocean, are analogs in many ways. Both species display similar patterns of …
View article: Electronic tagging and tracking aquatic animals to understand a world increasingly shaped by a changing climate and extreme weather events
Electronic tagging and tracking aquatic animals to understand a world increasingly shaped by a changing climate and extreme weather events Open
Despite great promise for understanding the impacts and extent of climate change and extreme weather events on aquatic animals, their species, and ecological communities, it is surprising that electronic tagging and tracking tools, like bi…
View article: Effects of egg stocking on density, distribution, and size of young‐of‐year brown trout (<i>Salmo trutta</i>) in a large boreal river in northern Sweden
Effects of egg stocking on density, distribution, and size of young‐of‐year brown trout (<i>Salmo trutta</i>) in a large boreal river in northern Sweden Open
An understanding of egg densities and juvenile production is critical in salmonid egg stocking projects, but the question is not deeply studied. Given that managers rely on the number of young of the year (YOY) fish to evaluate stocking su…
View article: Comparison of triploid and diploid rainbow trout (Oncorhynchus mykiss) fine-scale movement, migration and catchability in lowland lakes of western Washington
Comparison of triploid and diploid rainbow trout (Oncorhynchus mykiss) fine-scale movement, migration and catchability in lowland lakes of western Washington Open
Fisheries managers stock triploid (i.e., infertile, artificially produced) rainbow trout Oncorhynchus mykiss in North American lakes to support sport fisheries while minimizing the risk of genetic introgression between hatchery and wild tr…
View article: Guiding downstream migrating Atlantic salmon (<i>Salmo salar</i>) and brown trout (<i>Salmo trutta</i>) of different life stages in a large river using bubbles
Guiding downstream migrating Atlantic salmon (<i>Salmo salar</i>) and brown trout (<i>Salmo trutta</i>) of different life stages in a large river using bubbles Open
Salmonid repeat spawners are precious individuals for wild populations due to their high fecundity and previous spawning experience, making them important in environmental policy. However, repeat spawners rarely exist above hydropower dams…
View article: Positioning aquatic animals with acoustic transmitters
Positioning aquatic animals with acoustic transmitters Open
Geolocating aquatic animals with acoustic tags has been ongoing for decades, relying on the detection of acoustic signals at multiple receivers with known positions to calculate a 2D or 3D position, and ultimately recreate the path of an a…
View article: Dispersal of brown trout (<i>Salmo trutta</i> L.) fry in a low gradient stream ‐ implications for egg stocking practices
Dispersal of brown trout (<i>Salmo trutta</i> L.) fry in a low gradient stream ‐ implications for egg stocking practices Open
Stocking of eggs is a common strategy to support declining or reintroduce extirpated salmonid populations. Data on how juveniles disperse from stocking points is crucial to be able to design efficient stocking programs. Detailed informatio…
View article: Frontiers in quantifying wildlife behavioural responses to chemical pollution
Frontiers in quantifying wildlife behavioural responses to chemical pollution Open
Animal behaviour is remarkably sensitive to disruption by chemical pollution, with widespread implications for ecological and evolutionary processes in contaminated wildlife populations. However, conventional approaches applied to study th…
View article: Big-data approaches lead to an increased understanding of the ecology of animal movement
Big-data approaches lead to an increased understanding of the ecology of animal movement Open
Understanding animal movement is essential to elucidate how animals interact, survive, and thrive in a changing world. Recent technological advances in data collection and management have transformed our understanding of animal “movement e…
View article: Additional file 1 of The effect of externally attached archival data loggers on the short-term dispersal behaviour and migration speed of European eel (Anguilla anguilla L.)
Additional file 1 of The effect of externally attached archival data loggers on the short-term dispersal behaviour and migration speed of European eel (Anguilla anguilla L.) Open
Additional file 1:Table S1. This table shows the IDs of the eleven retrieved PDSTs and whether or not the eels had an internally implanted acoustic transmitter. The release and pop-off date time is indicated, as well as the time the tag wa…
View article: Impacts of Oxazepam on Perch (<i>Perca fluviatilis</i>) Behavior: Fish Familiarized to Lake Conditions Do Not Show Predicted Anti-anxiety Response
Impacts of Oxazepam on Perch (<i>Perca fluviatilis</i>) Behavior: Fish Familiarized to Lake Conditions Do Not Show Predicted Anti-anxiety Response Open
A current theory in environmental science states that dissolved anxiolytics (oxazepam) from wastewater effluents can reduce anti-predator behavior in fish with potentially negative impacts on prey fish populations. Here, we hypothesize tha…
View article: A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow
A Contraction Based Solution for the Improvement of Fish Ladder Attraction Flow Open
A new, potentially cost efficient, concept for improving the attraction flow to a fish ladder has been investigated in a case study. For the upstream migrating Atlantic salmon to reach the fish ladder and by-pass the case study hydropower …
View article: Validation of Francis–Kaplan Turbine Blade Strike Models for Adult and Juvenile Atlantic Salmon (Salmo Salar, L.) and Anadromous Brown Trout (Salmo Trutta, L.) Passing High Head Turbines
Validation of Francis–Kaplan Turbine Blade Strike Models for Adult and Juvenile Atlantic Salmon (Salmo Salar, L.) and Anadromous Brown Trout (Salmo Trutta, L.) Passing High Head Turbines Open
The negative effects of hydroelectric power (HEP) on salmonid populations has long been recognized and studied. Downstream passage through turbines may potentially constitute a significant source of mortality for both juvenile and adult fi…