INTRODUCTION NERI et al. (1965) found that Latrodectus tredecimguttatus venom at a minimal concentration of 400 hg of protein per ml upon application first enhanced and then suppressed the endogenous (spontaneous) activity recorded on one cereal nerve in the isolated nerve cord ofPeriplaneta americana. They also observed that the endogenous activity could be restored by immersing the cord in a ...

An experimental study was carried out to investigate direct and direct plus trophic contamination routes of the crayfish Astacus astacus by inorganic mercury (Hg(II)) or methylmercury (MeHg). Direct exposure was based on low contamination conditions, 300 and 30 ng/L in the dissolved phase, respectively, during 30 d at 20 degrees C. Trophic exposure was based on daily consumption of the Asiatic ...

Mechanotransduction or mechanosensitivity is found in almost every cell in all organisms from bacteria to vertebrates. Mechanosensitivity covers a wide spectrum of functions from osmosensing, cell attachment, classical sensory mechanisms like tactile senses in the skin, detection of sound in hair cells of the hearing apparatus, proprioceptive functions like recording of muscle length and tensio...

Two morphotypes of the crayfish parasite Psorospermium haeckeli were isolated from 2 crayfish species of different geographical origin. The oval-shaped sporocysts were obtained from the epidermal and connective tissue beneath the carapace of the noble crayfish Astacus astacus from Sweden and Finland. Elongated spores were isolated from the abdominal muscle tissue of the red swamp crayfish Proca...

For 150 years the crayfish plague disease agent Aphanomyces astaci has been cause of mass mortalities among native European populations. However, recently several studies have highlighted great variability A. virulence and resistance toward disease. The main aim this study was to compare response two species, noble ( Astacus astacus ) invasive alien marbled Procambarus virginalis ), an challeng...

The population of noble crayfish ( Astacus astacus ) was researched in quarries an old brick plant Molodechno district Minsk region. Rare disappearing found 10 closed quarries. presence that are not connected with watercourses indicates these populations were created by man. the factory is characterized a high number. average catch eel traps 1.31 ± 0.77 individuals/trap/day. Crayfish first and ...

The freshwater ecosystems in the Republic of North Macedonia are considered as biodiversity hotspot on European level since they provide diverse habitats that correspond with complex ecological preferences many species require. This specially applies to crustaceans that, unfortunately, have never been focus a continuous research. In R. Macedonia, usually inhabit exposed negative anthropogenic i...

Noble crayfish Astacus astacus is threatened in Europe due to invasive crayfish carrying the crayfish plague agent Aphanomyces astaci. Norway is among the last countries in which the introduction of non-indigenous crayfish has been limited through strict legislation practices. However, North American signal crayfish Pacifastacus leniusculus were recently discovered in a water-course that has be...

Aphanomyces astaci, a specialised parasite of North American freshwater crayfish, is the disease agent of crayfish plague that is lethal to European freshwater crayfish. The life cycle of A. astaci has been inferred from experimental laboratory studies, but less is known about its natural sustainability and ecology. To address such questions, tools for monitoring of A. astaci directly in aquati...