Fish Passage 2017 – International Conference on Engineering and Ecohydrology for Fish Passage will be held in Corvallis, Oregon, USA on June 19-21 2017. The confererence ”…promises to be an important international forum for researchers and practitioners to exchange findings and experiences on fish passage issues.

Fish Passage 2017 will be of interest to researchers, educators, practitioners, funders, and regulators who have an interest in advancements in technical fishways, nature-like fishways, stream restoration and stabilization, dam removal, and the myriad of funding, safety, climate change, and other socio-economic related issues surrounding connectivity projects.

This is a three-day conference with concurrent sessions in engineering, biology, management and monitoring techniques. The conference will also feature plenary talks, professional networking opportunities, and a poster session. Independently offered short courses, workshops and tours will be available immediately before and/or after the conference.”

Plenary speakers will be say’ay’ – John Eli Sirois, Futoshi Nakamura, Tony Farrell, Paul T. Jacobson, and Kurt D. Fausch. Read more about the plenary speakers here. Also, pre-conference short courses and post-conference tours are available. Read more about the conference at




John Piccolo recommends the short film ”Lahontan Cutthroat Trout: A prehistoric legend returns”. The film briefly discusses the restoration of cutthroat trout to Pyramid Lake and the Truckee River in Nevada, USA. This strain of cutthroat trout was assumed extinct until remnants of the population were found in streams in neighboring Pilot Peaks. This started great efforts to re-introduce the socially and culturally important fish population to the lake. Watch the film here:

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Dokumentären ”Tana älv – mellan tre länder” (”Tanaelv – den beste elva” på norska) ligger just nu uppe på SVT-play. FIlmen handlar om laxen i älven och människorna runt den. Forskare, förvaltare, husbehovsfiskare och repressentanter för turistfisket kommer till tals. Älven – och dess biflöden – är hem för en mängd lokalt anpassade laxpopulationer och fisketrycket måste minskas för att skydda hotade laxpopulationer. Detta skapar både lokala och internationella konflikter.


Se filmen på SVT-Play eller på NRK:s hemsida.

A postdoc position in the ecology of river restoration is open for applications at Karlstad University: ”The main duty of the position is to conduct research on the effects of dam removal and the installation of fish-friendly turbines on river connectivity and ecology. Intact river connectivity is essential for many organisms in running water, and especially so for organisms that move between different habitats to complete their life cycle, such as many migratory fish species. Many rivers are modified by dams such as hydroelectric power plants. Dams disconnect river stretches and habitats, thereby reducing dispersal and migration possibilities for fish, benthos, and plants, with negative effects on individuals, populations, and communities. The post-doctoral candidate will be expected to evaluate the effects of complete dam removal and installation of fish-friendly turbines as measures to improve connectivity in rivers.”. The deadline for applying is February 28. Read the full announcement here:

Post-doctoral Research Fellow in Ecology of River Restoration: Dam Removal and fish-friendly Turbine

As advertised previously, NRRV at Karlstad University, also has two additional openings for full-time post-doctoral research fellows and one opening for a PhD-student (deadline February 10). Read full announcements for these positions here:

Post-doctoral Research Fellow in Aquatic-Terrestrial Linkages

Post-doctoral Research Fellow in Ecology of River Connectivity.

PhD position in Global climate change and winter ecology

A PhD-position in the field of global climate change, as it relates to the ecology of stream fishes in winter, is now open for applicants at Karlstad University. The position is a full time position for 4 years within the River Ecology and Management (NRRV) group at the Department of Environmental and Life Sciences. Read more about the position on

As advertised previously, NRRV also has two openings for full-time post-doctoral research fellows. One position is in the field of stream-riparian ecology with focus on the reciprocal interactions and linkages between aquatic and terrestrial habitats. The other position is on river connectivity with focus on rehabilitation, management and development strategies. Read full post-doc position announcements here: Post-doctoral Research Fellow in Aquatic-Terrestrial Linkages and Post-doctoral Research Fellow in Ecology of River Connectivity.

Last Tuesday, Ewa Orlikowska, PhD-student at Swedish University of Agricultural Sciences, gave a seminar titled ”Gaps in ecological research on the world’s largest internationally coordinated network of protected areas: A review of Natura 2000” at Karlstad University. The seminar is available online upon request. Send an e-mail to to get access to the seminar.

The papers Gaps in ecological research on the world’s largest internationally coordinated network of protected areas: A review of Natura 2000 and Contribution of social science to large scale biodiversity conservation: A review of research about the Natura 2000 network, both by Orlikowska et al. relate to the seminar content.


Natura 2000 sites. Map from European Environment Agency.

nyqvist2016cLast Friday, I, Daniel Nyqvist, successfully defended my PhD-thesis ”Atlantic salmon in regulated rivers – Migration, dam passage, and fish behavior” at Karlstad University. Scott Hinch (University of British Columbia, Canada) was opponent and Eva Thorstad (NINA, Norway), Kim Aarestrup (DTU AQUA, Denmark) and Hans Lundqvist (Swedish University of Agriculture) constituted the grading committee (betygskommitté). The short abstract of the thesis reads:

”Hydropower dams block migration routes, thereby posing a threat to migratory fish species. Fishways and other fish passage solutions may aid fish to pass hydropower dams. A functional fish passage solution, however, must ensure safe and timely passage for a substantial portion of the migrating fish. In this thesis, I focus on downstream passage and evaluate the behavior and survival of migrating Atlantic salmon in relation to dams in systems with (1) no fish passage solutions (2) simple passage solutions (3) best available passage solutions. In addition, I studied the survival and behavior of post-spawners and hatchery-released smolts.

A large portion of the spawners survived spawning and initiated downstream migration. For hatchery-reared smolts, early release was associated with faster initiation of migration and higher survival compared to late release. Multiple dam passage resulted in high mortality, and high spill levels were linked to high survival and short delay for downstream migrating salmon. For smolts, dam passage, even with simple passage solutions, was associated with substantial delay and mortality. Rapid passage of a large portion of the migrating adult salmon was achieved using best available passage solutions.”

The frame of the thesis is available here. Already published papers included in the thesis are Post-Spawning Survival and Downstream Passage of Landlocked Atlantic Salmon (Salmo salar) in a Regulated River: Is There Potential for Repeat Spawning? (in River Research and Applications) and Migratory delay leads to reduced passage success of Atlantic salmon smolts at a hydroelectric dam (in Ecology of Freshwater Fish). For full access to the thesis, contact

Imorgon, onsdagen den 7:e december, kommer Johan Watz, forskare vid Karlstads Universitet, att berätta om öringens vinterbeteende i rinnande vatten. Evenemanget är en del av universitetets ”Möt en forskare”-serie och ges kl. 12:00 – 12:45 i Studieverkstaden på plan 3 i universitetets bibliotek. Alla är välkomna!



Freshwater pearl mussels.

The paper ”Heavy loads of parasitic freshwater pearl mussel (Margaritifera margaritifera L.) larvae impair foraging, activity and dominance performance in juvenile brown trout (Salmo trutta L.)”  by Karl Filipsson, Tina Petersson, Johan Höjesjö, John Piccolo, Joacim Näslund, Niklas Wengström, Martin Österling was recently published in Ecology of Freshwater Fish. In the abstract the authors write:

”The life cycle of the endangered freshwater pearl mussel (Margaritifera margaritifera) includes a parasitic larval phase (glochidia) on the gills of a salmonid host. Glochidia encystment has been shown to affect both swimming ability and prey capture success of brown trout (Salmo trutta), which suggests possible fitness consequences for host fish. To further investigate the relationship between glochidia encystment and behavioural parameters in brown trout, pairs (n = 14) of wild-caught trout (infested vs. uninfested) were allowed to drift feed in large stream aquaria and foraging success, activity, agonistic behaviour and fish coloration were observed. No differences were found between infested and uninfested fish except for in coloration, where infested fish were significantly darker than uninfested fish. Glochidia load per fish varied from one to several hundred glochidia, however, and high loads had significant effects on foraging, activity and behaviour. Trout with high glochidia loads captured less prey, were less active and showed more subordinate behaviour than did fish with lower loads. Heavy glochidia loads therefore may negatively influence host fitness due to reduced competitive ability. These findings have implications not only for management of mussel populations in the streams, but also for captive breeding programmes which perhaps should avoid high infestation rates. Thus, low levels of infestation on host fish which do not affect trout behaviour but maintains mussel populations may be optimal in these cases.”

Read the paper here. If you don’t have access to the journal’s content, email any of the authors.