Abstract Microplastics are frequently detected in the gastrointestinal tracts of aquatic organisms worldwide. A number active and passive pathways have been suggested for fish, including confusion microplastic particles with prey, accidental uptake while foraging transfer through food chain, but a holistic understanding influencing factors is still lacking. The aim study was to investigate theories identify relevant biotic factors, as well certain plastic properties, affecting intake fish....

The rising evidence of microplastic pollution impacts on aquatic organisms in both marine and freshwater ecosystems highlights a pressing need for adequate comparable detection methods. Available tissue digestion protocols are time-consuming (>10 h) and/or require several procedural steps, during which materials can be lost contaminants introduced. This novel approach comprises an accelerated step using sodium hydroxide nitric acid combination to digest all organic material within 1 h plus...

Abstract The pollution of aquatic systems with microplastics (MPs) affects marine and freshwater fish species worldwide. However, little is known about the size‐dependent retention time these inert particles. To approach this question, MP particles was examined in two distinct differences gastrointestinal morphology: rainbow trout ( Oncorhynchus mykiss ) a true stomach, stomachless common carp Cyprinus carpio ). A special diet developed that contained environmentally relevant concentrations...

Adaptive divergence and increased genetic differentiation among populations can lead to reproductive isolation. In Lake Constance, Germany, a population of invasive three-spined stickleback ( Gasterosteus aculeatus ) is currently diverging into littoral pelagic ecotypes, which both nest in the zone. We hypothesized that assortative mating behaviour contributes isolation between these ecotypes performed behavioural experiment females could choose two nest-guarding males. Behaviour was...

Abstract The Aach cave loach (Barbatula barbatula), a recently discovered member of the Nemacheilidae family, offers unique opportunity to understand mechanisms underlying evolutionary change. In common garden experiment, we reared groups laboratory-bred cave, surface, and hybrid under different light conditions. Troglomorphic characters varied significantly among fish, influenced extent by parental origin Cavefish progeny consistently exhibited smaller eyes, lighter pigmentation, longer...

The rapid expansion of three-spined stickleback ( Gasterosteus aculeatus Linnaeus, 1758 (Perciformes, Gasterosteida)) in the pelagic zone Lake Constance, Central Europe, since 2012 contributed to stark ecosystem-wide effects, such as food-web shifts and declines native biodiversity, including commercially important fish species. Yet, origin this invasive population remains unclear. Using RAD-sequencing Constance sticklebacks, we show that likely arose recently within lake, potentially from...

The European catfish (Silurus glanis) is a large apex predator native to Eastern Europe. Increasing populations within and outside the species' range in recent years, its popularity with recreational anglers are fueling discussions about appropriate management. To understand motivations of their views on different management strategies, an internet survey was conducted southern Germany. results showed that differ several aspects from those targeting other species. For specialists, fishing...

Abstract The pollution of the environment with microplastics (MPs) is affecting aquatic organisms worldwide, and yet intensive research, has thus far failed to deliver an adequate understanding detrimental effects MP ingestion by fish. Investigations using established health performance parameters are often insufficient determine toxicity, especially when considering MPs in environmentally relevant concentrations. In present study, label-free quantitative (LFQ) proteomics liver tissue was...

Climate change potentially threatens the sustainable production of highly valued cold-water fish species in flow-through systems, such as salmonids. By analysing relationship water temperature to hydrological characteristics, air temperature, solar exposure, and precipitation, this study predicted dynamics five temperate aquaculture facilities under four projected climate scenarios. Air was found be directly associated with facility site based on rational assumptions, two were face critical...

Since 2012, a massive invasion of the three-spined stickleback (Gasterosteus aculeatus) has taken place into pelagic area Lake Constance. This species, which had previously been restricted to littoral zone, is now dominant fish and whitefish (Coregonus wartmanni) suffered severe reductions in growth recruitment. In this study, total, 2871 sticklebacks were collected via monthly sessions over 4-year period benthic areas Constance examined for signs infection with Schistocephalus solidus,...

Abstract Using a cross-fostering experiment, we provide evidence for the contribution of both genetic differentiation and phenotypic plasticity to troglomorphic character development in recently discovered cave form Barbatula barbatul a, an evolutionarily young lineage first cavefish described Europe, northernmost record. We established reproducing populations cave- surface-dwelling loaches produce cave, surface, hybrid offspring reared F1 fish common garden setting total darkness (DD)...

The unusual yellow-finned morph of European perch Perca fluviatilis found in Lake Constance suffers more severely from macroparasite infections, including the tapeworm Triaenophorus nodulosus and gill worm Ancyrocephalus percae, than conspecifics elsewhere. Microsatellite analysis P. red-finned variant recently discovered revealed significant genetic differentiation. Red-finned fish with mixed fin colour, suggested backcrosses between red colour morphs, exhibit better resilience to parasite...

Abstract The rapid invasion of the pelagic zone in Lake Constance by three-spined sticklebacks ( Gasterosteus aculeatus ) since 2012 and their subsequent drastic population growth has had stark ecosystem-wide effects, such as food-web shifts declines native biodiversity, including commercially important fish species. Yet, origin this invasive ecotype remains unclear. This study aims to determine if arose situ from existing littoral or following external colonisation, identify potential...

Abstract Successful conservation of cryptic species such as representatives the genus Cobitis presents a challenge for fishery managers. Only taenia L. is currently assumed to occur in southwest Germany, where it classified critically endangered. Established genetic markers and eDNA analysis identified three study area. elongatoides were widely distributed Rhine River system, primarily forming hybrid complexes which polyploid individuals dominate but coexist with diploid parent species. A...

In the welcome circumstance that species believed extinct are rediscovered, it is often case biological knowledge acquired before presumed extinction limited. Efforts to address these gaps, in particular assess taxonomic integrity and conservation status of such species, can be hampered by a lack genetic data scarcity samples museum collections. Here, we present proof-of-concept study based on multidisciplinary evaluation approach tackle problems. The was developed after rediscovery, 40...

Abstract In the summer of 2015, large amounts artificial fertilizer containing ammonium nitrate were accidentally discharged into Jagst River along with water used to extinguish a serious fire. The incident caused massive fish kill first 25 km downstream spill and impacted density 50 stretch this sensitive important river. study, long-term effects accident on local fauna investigated, implemented restoration measures evaluated. A majority surviving immediate exhibited gill damage weakness...

Zusammenfassung Die aquatische Biodiversitat ist weltweit durch eine Vielzahl von Einflussen bedroht und im Niedergang begriffen. Vor allem anthropogene Eingriffe, invasive Arten die Folgen des Klimawandels fuhren zu einer Gefahrdung ehemals weit verbreiteten Arten. Durch sich standig andernden Umwelteinflusse vor der Schutz lokalen genetischen Diversitat essentiell. Die Fortschritte in Wissenschaft den letzten Jahren ermoglichen es heute, genetische auch groserem Umfang untersuchen. Mit...