Article
Marine & Freshwater Biology
Zivile Jurgelene, Danguole Montvydiene, Saulius Stakenas, Justas Poviliunas, Simonas Rackauskas, Ricardas Taraskevicius, Vesta Skrodenyte-Arbaciauskiene, Nijole Kazlauskiene
Summary: This study investigates the effects of different brands of alizarin dye on fish health and finds significant differences between brands. The results demonstrate that the toxicity of the dye varies depending on its concentration and the developmental stage of the fish.
AQUATIC TOXICOLOGY
(2022)
Article
Fisheries
Gasper Renko, Ida Djurdjevic, Simona Susnik Bajec
Summary: A novel protocol for the isolation of chromatophores from brown trout skin was developed based on previous research on zebrafish, enabling specific gene expression evaluation. The method is simple, fast, and ethical, allowing for monitoring at multiple time points, and should be effective for the majority of salmonid species due to similarities in skin morphology.
Article
Environmental Sciences
Daniel Palm, James Losee, Susanna Andersson, Gustav Hellstroem, Annika Holmgren, Goran Spong
Summary: Stocking of eggs is a common strategy for supporting declining or reintroducing extinct salmonid populations. This study measured the dispersal distance of brown trout fry in a low gradient stream in Sweden. The majority of fry dispersed downstream and stayed within 200 m from the stocking point, with no difference based on fry size or the presence of competing cohorts. Genetic influence on dispersal distances was not observed. The study suggests that stocking points should be separated by approximately 330 m to avoid habitat overlap between fry from different stocking points.
RIVER RESEARCH AND APPLICATIONS
(2023)
Article
Fisheries
Adam M. Lejk, Grzegorz Radtke
Summary: The study compared basic biological parameters of marked and unmarked lake-migratory brown trout juveniles and found no significant differences between the two groups in three consecutive seasons. However, notable differences in overall condition and survival of juveniles between seasons were observed, likely due to streambed regulation. Variations in specific growth rate may be affected by the size of fish before stocking, providing assumptions for restocking and recovery activities.
FISHERIES RESEARCH
(2021)
Article
Microbiology
Katharina Keiz, Sebastian Ulrich, Jasmin Wenderlein, Patrick Keferloher, Anna Wiesinger, Klaus Neuhaus, Ilias Lagkouvardos, Helmut Wedekind, Reinhard K. Straubinger
Summary: The bacterial community of brown trout from unfertilized egg to 95 days post fertilization (dpf) was studied using 16S rRNA gene amplicon sequencing. Significant changes in bacterial richness, microbial diversity, and taxonomic composition were observed during early developmental stages until 67 dpf, while the bacterial community seemed to stabilize in the fry stages from 67 to 95 dpf.
Article
Fisheries
Matti Janhunen, Nico Alioravainen, Teuvo Niva
Summary: This study investigated the impact of stocking programs on the migration behavior of brown trout. The results showed that brown trout native to River Juutuanjoki were more likely to return to their birthplace for spawning compared to trout from neighboring rivers. The release area had a minimal effect on the migration behavior of the stocked fish.
FISHERIES RESEARCH
(2023)
Article
Fisheries
Eric R. Fetherman, Brian W. Avila
Summary: Habitat restoration activities in large rivers focus on improving juvenile or adult habitats, but incorporating fry habitat associations into designs can increase overall success. Rainbow trout and brown trout fry were found in habitats with specific substrate sizes, velocities, and depths, with some overlap in associations between the two species. Adjusting restoration activities based on different habitat associations may allow for more effective single-species management and decrease fry infection severity.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Fisheries
Theo Valette, Maeva Leitwein, Jean-Marc Lascaux, Erick Desmarais, Patrick Berrebi, Bruno Guinand
Summary: The study used GWAS and redundancy analysis to explore the molecular basis of pigmentation variation in brown trout. They identified 337 independent loci associated with pigmentation traits, which mapped to 35 linkage groups and were related to 218 candidate genes. The findings suggest a polygenic genomic architecture of pigmentation in brown trout.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Multidisciplinary Sciences
Natalia Kurhaluk, Halyna Tkachenko
Summary: This study investigated the effects of different development stages, survival forms, and sex on the functional stability of sea trout muscle tissue. It found sex-related relationships in antioxidant balance and muscle tissue degradation in the adult stage, as well as modifications in lysosomal functioning due to long-term environmental stress.
SCIENTIFIC REPORTS
(2021)
Article
Fisheries
Giusy Rusco, Michele Di Iorio, Stefano Esposito, Pierpaolo Gibertoni, Emanuele Antenucci, Valentino Palombo, Alessandra Roncarati, Nicolaia Iaffaldano
Summary: In external fertilizer fish, ovarian fluid (OF) plays a key role in improving sperm swimming performance and reducing the risk of genetic introgression of wild populations from introduced individuals.
Article
Biology
Louise C. Archer, Stephen A. Hutton, Luke Harman, W. Russell Poole, Patrick Gargan, Philip McGinnity, Thomas E. Reed
Summary: This study reveals complex associations between metabolic rate and growth rate in brown trout under different thermal environments, indicating a thermally sensitive metabolic phenotype with adaptive responses. The findings suggest that fluctuating selection related to growth plays an important role in shaping metabolic variation and adapting to climate change.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2021)
Article
Ecology
Richard D. Durtsche, Bror Jonsson, Larry A. Greenberg
Summary: Elevated egg incubation temperature leads to lower metabolic rates in juvenile brown trout, potentially impacting their energy expenditure and predatory abilities in a future warmer climate. The results support the countergradient variation hypothesis, showing that thermal conditions can produce phenotypic patterns in metabolic rates. The differences observed were likely due to plastic responses rather than genetic differences among populations.
Article
Fisheries
Kristi Kaello, Henrik Baktoft, Martin Lykke Kristensen, Kim Birnie-Gauvin, Kim Aarestrup
Summary: Natal homing is a common strategy among salmonids, but not all individuals return to their natal river and may stray. This study investigated straying in an anadromous brown trout population and found that 36% of individuals were detected in non-natal rivers. Individuals spending longer time at sea were less likely to stray. The likelihood of straying also depended on the developmental status during out-migration, with lower likelihood for parr compared to pre-smolt and smolt.
ICES JOURNAL OF MARINE SCIENCE
(2022)
Article
Fisheries
Richard J. Kennedy, Robert Rosell, Michelle Allen
Summary: This study used acoustic telemetry to investigate the phenology of trout parr and found that there is a widespread downstream migration during the autumn. The autumn migrants were larger and heavier than the spring migrants, but their condition factor was similar. The migration behavior of trout stocks in autumn poses management challenges.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Food Science & Technology
Muhammed Atamanalp, Arzu Ucar, Esat Mahmut Kocaman, Gonca Alak
Summary: The research aimed to determine the shelf life of products obtained by using humic acid in trout culture, finding that while humic acid did not affect the chemical composition, color, and texture, it had a significant impact on mineral substance, pH, TBARS, TVB-N, and microbiological results. During storage, there were fluctuations in all analyzed values, but the group with 2% humic acid showed relatively lower values in microbiological and physico-chemical analysis results at the end of the storage period.
FOOD PACKAGING AND SHELF LIFE
(2021)
Article
Fisheries
J. Tyrell DeWeber, Roland Roesch, Jan Baer, Alexander Brinker
Summary: The study found that changes in the body condition of Lake Constance whitefish are closely linked to gillnet selectivity. Simulations demonstrated that an increase in weight could lead to changes in length selection, and ignoring these selectivity changes may result in a bias towards younger harvested whitefish.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2021)
Article
Multidisciplinary Sciences
Sarah M. Gugele, Marcus Widmer, Jan Baer, J. Tyrell DeWeber, Helge Balk, Alexander Brinker
Summary: This study successfully differentiated between whitefish and stickleback, two similar-sized swim-bladdered species, using wideband hydroacoustic technology in a mesocosm experiment. The results demonstrate that species can be identified with reasonable accuracy using hydroacoustic technology. Further research is needed to determine the capabilities and limitations of this technology in classifying additional species and monitoring fish communities.
SCIENTIFIC REPORTS
(2021)
Article
Ecology
Jan Baer, J. Tyrell DeWeber, Roland Resch, Alexander Brinker
Summary: Increased whitefish aquaculture production is needed to meet demand, but technical limitations and other factors in different countries are hindering progress.
ANNALES ZOOLOGICI FENNICI
(2021)
Article
Multidisciplinary Sciences
Jan Baer, Sarah Maria Gugele, Joachim Bretzel, J. Tyrell DeWeber, Alexander Brinker
Summary: The study found that under controlled conditions, three-spined sticklebacks can ingest a large number of whitefish eggs under any light conditions and eggs can still be unambiguously identified 24 hours after ingestion. Whitefish eggs have 28% more energy content compared to the main diet of sticklebacks (zooplankton), highlighting the potential benefits of consuming eggs for sticklebacks. It is possible that even if relatively few sticklebacks consume eggs, they could potentially consume substantial proportions of the total eggs produced.
Article
Fisheries
Jan Baer, Christina Spiessl, Alexander Brinker
Summary: This study conducted a field research in Lake Constance to systematically evaluate the importance of the invasive quagga mussel to the native fish community. The results showed that almost all benthivorous fish are able to efficiently forage on quagga mussels, but consumption is more limited for a commercially important keystone species, the benthic whitefish. The energy content of quagga mussels is size-dependent with seasonal effect, and the study discussed its implications for fish stocks, food web integrity, and fishery management.
JOURNAL OF FISH BIOLOGY
(2022)
Article
Environmental Sciences
Jan Baer, Christina Spiessl, Karl Auerswald, Juergen Geist, Alexander Brinker
Summary: The arrival of invasive quagga mussels in Lake Constance has led to significant changes in zooplankton and benthic invertebrate communities, impacting other components of the food web such as fish.
JOURNAL OF GREAT LAKES RESEARCH
(2022)
Article
Parasitology
Jan Baer, Sarah M. Gugele, Samuel Roch, Alexander Brinker
Summary: Since 2012, a massive invasion of three-spined stickleback into the pelagic area of Lake Constance has occurred, resulting in severe reductions in growth and recruitment of the previously dominant whitefish. A study found that the risk of infection with the potentially fatal parasite Schistocephalus solidus increases throughout the year and is influenced by the size and sex of the sticklebacks. The impact of the parasite is limited to post-reproductive adults, allowing for stable reproduction of the hosts despite high transmission and mortality rates.
PARASITOLOGY RESEARCH
(2022)
Article
Ecology
J. Tyrell DeWeber, Jan Baer, Roland Roesch, Alexander Brinker
Summary: Global changes such as species invasions, climate change, and nutrient pollution have significantly altered ecosystems, food webs, and bioenergetic processes. This study focuses on the growth of the keystone pelagic whitefish in Lake Constance, Germany, and explores how nutrient dynamics, species invasions, and changing temperatures have influenced their growth. The results highlight the importance of considering biotic interactions and mechanistic models in global change studies and provide valuable insights for ecosystem management.
Article
Ecology
Jan Baer, Ulrich K. K. Schliewen, Frederic D. B. Schedel, Nicolas Straube, Samuel Roch, Alexander Brinker
Summary: This study presents a multidisciplinary data evaluation approach to assess the taxonomic integrity and conservation status of the rediscovered Lake Constance deep-water charr Salvelinus profundus. The results show that the extant deep-water charr matches the historical specimens, while significant differences are found between historical and extant normal charr. Genomic analyses reveal high divergence between the two extant forms, suggesting non-endemic charr stocking as the likely cause.
ECOLOGICAL APPLICATIONS
(2023)
Article
Engineering, Environmental
Leoni Mack, Camino Fernandez de la Hoz, Marcin Penk, Jeremy Piggott, Tasman Crowe, Daniel Hering, Willem Kaijser, Jukka Aroviita, Jan Baer, Angel Borja, Dana E. Clark, Yolanda Fernandez-Torquemada, Jonne Kotta, Christoph D. Matthaei, Francis O'Beirn, Hans W. Paerl, Adam Sokolowski, Annika Vilmi, Sebastian Birk
Summary: Multiple stressors continuously deteriorate surface waters, posing challenges to their conservation and restoration. Identifying prevalent combined effect types is critical for environmental management. Observed effects may often be statistical artefacts rather than representing true ecological processes.
Editorial Material
Fisheries
Albert Ros, Jan Baer, Alexander Brinker
Summary: In PKD-affected streams in southern Germany, brown trout treated with local parasite spores and kept at low temperatures (14 degrees C) have lower parasite prevalence compared to control and wild-caught trout.
FISHERIES MANAGEMENT AND ECOLOGY
(2023)
Article
Fisheries
Samuel Roch, Patrick Bartolin, Pascal Vonlanthen, Jan Baer, Simon Grundmueller, Laura S. Epp, Alexander Brinker
Summary: This study identified three Cobitis species in Germany, including Cobitis taenia, Cobitis elongatoides, and Cobitis bilineata. Hybrid species complexes consisting of polyploid individuals were found in the Rhine River system, while Cobitis bilineata was recently established in the southern part of the Rhine. In the Danube River catchment, diploid and polyploid representatives of C. elongatoides were found in two populations, one of which was previously thought to be extinct. These findings provide important information for targeted conservation strategies for Cobitis species in the region.
FISHERIES MANAGEMENT AND ECOLOGY
(2023)
Article
Fisheries
J. Baer, M. Kugler, M. Schubert, N. Schotzko, R. Roesch, P. Vonlanthen, J. T. DeWeber
Summary: The tradition of stocking whitefish in European lakes, including Lake Constance, is being questioned due to the decreasing success rate and changing ecosystems. The last evaluation in 2003 showed declining effects, and recent experiments suggest that stocking is no longer cost-effective. Factors that previously influenced recruitment, such as water temperature, may not apply anymore.
FISHERIES MANAGEMENT AND ECOLOGY
(2023)
Article
Environmental Sciences
Julia Gaye-Siessegger, Mark Schumann, Jan Baer, Samuel Roch, Lukas Ittner, Alexander Brinker
Summary: In the summer of 2015, a massive fish kill occurred in the Jagst River due to the accidental discharge of artificial fertilizer containing ammonium nitrate, which was used to extinguish a fire. The incident had long-term effects on the local fish fauna and impacted fish density in a 50 km stretch of the river. In response, restoration measures were implemented, including systematic stocking and natural migration. The measures were able to restore species diversity back to pre-accident levels within 36 months, but fish density remains lower and shows no sign of further recovery due to lack of connectivity in relevant sections of the river and predation from an increasing population of cormorants.
WATER AIR AND SOIL POLLUTION
(2023)
Article
Biodiversity Conservation
Sarah Maria Gugele, Jan Baer, Christina Spiessl, Elizabeth Yohannes, Steve Blumenshine, Barnaby J. Roberts, Mario R. Mota-Ferreira, Alexander Brinker
Summary: The three-spined stickleback was introduced into Lake Constance in the 1940s and initially had a limited range. However, since late 2012, the species has expanded its range and now migrates seasonally. This change in behavior has led to a significant increase in stickleback abundance.
