The European catfish (Silurus glanis L., 1758) is an important species for the aquaculture sector and production of quality broodstock in artificial fertilization methods as well. One crucial steps determining success reproduction to obtain sufficient good-quality sperm. aim this study compare two different used sperm from catfish. first method surgery extraction testicular taking testicles (CS...

The European catfish (Silurus glanis) was introduced in Italy during the last century for aquaculture purposes, and now it is well-established. S. glanis an invasive species a top predator that can deplete prey supply surrounding habitat, leading to changes aquatic food web. Consequently, its presence considered threat native fish populations. Its Lake Maggiore (Northern Italy) recent there lac...

Abstract The aim of this research is to compare the average individual weight four most important fish species in fisheries ( Cyprinus carpio, Silurus glanis, Esox lucius and Sander lucioperca ), caught by angling different parts Sava River catchment Croatia. Significant differences were expressed between counties along catchment, with smallest specimens (p˂0.05) Vukovar-Sirmium county. Artisan...

Swimming fish leave wakes containing hydrodynamic and chemical traces. These traces mark their swim paths and could guide predators. We now show that nocturnal European catfish (Silurus glanis) locate a piscine prey (guppy, Poecilia reticulata) by accurately tracking its three-dimensional swim path before an attack in the absence of visible light. Wakes that were up to 10 s old were followed ov...

The ubiquity and fascinating nature of animal aggregations are widely recognised. We report here consistent and previously undocumented occurences of aggregations of a giant alien freshwater fish, the Wels catfish (Silurus glanis). Aggregative groups were on average composed of 25 (± 10 SD, ranging from 15 to 44) adults with estimated average total biomass of 651 kg (386 - 1132) and biomass den...

The behavioral strategies developed by predators to capture and kill their prey are fascinating, notably for predators that forage for prey at, or beyond, the boundaries of their ecosystem. We report here the occurrence of a beaching behavior used by an alien and large-bodied freshwater predatory fish (Silurus glanis) to capture birds on land (i.e. pigeons, Columbia livia). Among a total of 45 ...

The accumulation of some heavy metals such as Pb, Cd, Cu and Ni was determined in water sediment and fish samples (Albumus escherichii, Cyprinus carpio and Silurus glanis) collected from Nallihan Bird Paradise (NBP) and its vicinity (Sariyar Dam). The results showed that these metals are found widespread throughout the study area, but metal concentrations in the water samples are below the dete...