Most publications on the influence of environmental factors macroinvertebrate communities focus large rivers, whereas relatively few examine small watercourses in agricultural areas, which, due to their size and pressure from intensive production, are much more susceptible effects unfavourable conditions or anthropopressure. The aim our study was compare biodiversity macrozoobenthos assemblages determine physicochemical hydrological abundance density 10 rivers areas located northwest (53°23'...

In recent decades, rapid technological advancements have led to a growing influence of anthropogenic electromagnetic fields on aquatic ecosystems. These predominantly stem from energy infrastructure facilities such as wind farms, high-voltage lines, underwater transmission cables, and power plants. As result, there has been increasing interest in understanding the effects heightened ecosystems their inhabitants, including developing fertilized eggs. This study focused examining generated by...

The 2022 Oder River disaster was one of the most significant harmful events in recent European river history, with an estimated 60% reduction fish biomass lower section river. While prevailing hypothesis attributes associated kills to toxins from golden algae Prymnesium parvum , our histopathological study on gills 2 common cyprinid species, namely vimba bream Vimba (L.) and roach Rutilus rutilus (L.), collected at 3, 4, 6 mo after disaster, suggests another mechanism. showed damage...

Abstract Constant magnetic field of low value slows down the embryonic development trout (Salmo trutta), rainbow (Oncorhynchus mykiss). Hatchlings were longer and heavier, also more motile than those in control experiment. Magnetic induces a change circulation motion embryos larvae pike (Esox lucius) carp (Cyprinus carpio), (5. tnitta). Exposure to causes an increase heart rhythm, particularly during early pulsation period forming heart. fields cause gas exchange (O. Intensity breathing...

This study describes the egg membrane structures of angelfish (Pterophyllum scalare), morpho-physiological changes during embryogenesis from activation to hatching under optimal conditions (28°C; pH 6.8), developing larvae and fry, effect alkaline on early developmental stages species, relationship between food item size fry survival. Egg membranes (thin, transparent, 1.67-2.18 µm thick) are covered by a sticky substance. The amber-coloured eggs were oval in shape, with average diameters...

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Effects of a constant magnetic field on the selection swimming direction by trout (Salmo trutta L.) larvae and fry were investigated in an experimental facility consisting chambers equipped with magnets as well magnet-free placed at entrance. The experiments showed close relationship between selected presence or absence ferritic generating field. results obtained indicate during early ontogenesis, when newly hatched individual is no longer embryo but also not mature form, that larva...

Fish roe is among important components of human diet, but its elemental composition rather poorly known. In this study we used inductively coupled plasma mass spectrophotometer (ICP-MS) to examine the content As, Cd, Co, Cr, Mn, Mo, Ni, Pb and Se in sturgeon, sea trout rainbow trout. addition, risk assessment for consumer health was conducted by determination estimated daily intake (EDI), target hazard quotient (THQ), index (HI) carcinogenic (CR). Overall, elements formed following sequence...

The objective of the study was to investigate effects a static magnetic field on trout sperm motility parameters (CASA), DNA integrity (comet assay) and morphology (SEM). fertilisation rate also assessed. Exposing spermatozoa (1 mT, 5 10 mT) prolonged 12 days (288 h), while control remained motile for only 3 (72 h). Analysis fragmentation genetic material in spermatozoon head revealed no from studied fields. After 30-min exposure field, proportion fertilised eggs already 12.7% 15% (10 mT),...

Background. The effect of the magnetic field on fish egg shells has not attracted major interest researchers, even though it could have been predicted that such may be vital to embryogenesis. One hitherto-neglected aspects action eggs are changes in shell permeability and possible alteration process Studying this learning associated phenomena important explaining cases substantial mortality embryos. Materials methods. Fish (Atlantic salmon, Salmo salar L.; sea trout, trutta rainbow...

Background. The stinging catfish, Heteropneustes fossilis (Bloch, 1794), has recently raised interest among fish farmers, ornamental keepers, and pathologists. Its natural populations are threatened due to habitat loss high fishing pressure. A number of factors may influence the reproductive success this. aim this study was assess effect one such factors—the water hardness—on course embryogenesis, structure egg shell, general morphology, behaviour hatched larvae. Materials methods....

The effects of magnetic fields generated by ferritic magnets and mounted in entrances to fyke nets were studied 1999–2002. With respect all fish species trapped (perch, pike, roach, rudd, bleak, bream, ruffe) except eel, the catch potential magnet-rigged was found be significantly higher (almost 50% on average) when compared with controls. Differences magnet placement (N or S poles inside traps) proved have no significant importance number that chose enter nets. Specific behavioural...

Background.The magnetic field is known to exert its influence on both adult and juvenile fishes, as well the embryos.The effects are diversified pertain to, practically all, life aspects of an individual.Another aspect this issue can be existing still growing pollution natural environment.In view above we decided study embryonic motorics fish, exemplified by pike, affected constant-and alternating fields.Material methods.Eggs pike (Esox lucius L.) after period adaptation (control) were...

Background. After their deposition in water, eggs of perch form characteristic, long gelatinous ribbons (strands) floating within the water column. The ultrastructure external gelatinious egg envelope members family Percidae was believed to be amorphous. aim presently reported study describe and function composing ribbon. Materials methods. Fresh European perch, Perca fluviatilis L., were collected, ribbons, from females caught at spawning grounds on Odra River side canal Dziewoklicz, city...

Abstract Analysis of the physicochemical properties fresh eggs (raw material for caviar production) Salmonidae [sea trout ( Salmo trutta L. 1758) and rainbow Oncorhynchus mykiss, Walbaum 1792)] acipenseridae [siberian sturgeon Acipenser baeri Brandt, 1869)], as well hybrids 1869 × gueldenstaedti Brandt &amp; Ratzeburg, 1833), included determination basic parameters (pH, dry weight, content protein, fat, fiber ash), amino acid composition fatty profile. Compared to Acipenseridae , yielded a...

The brown trout (Salmo trutta) is a salmonid residing in riverine and coastal waters throughout the Northern Hemisphere, whose various populations evolved into distinct ecological morphs, differing their migratory tendencies preferred habitats. Unfortunately, due to progressing degradation of natural environment, conservation these growing importance undoubtedly challenging task. Therefore, means refine preparatory protocols for restocking using hatchery-reared fish are being pursued, some...

Studies were undertaken on the relationship between egg size and duration of embryogenesis in four freshwater fish species (Salmo trutta L, Esox lucius L., Gasterosteus aculeatus Leucaspius delineatus Heck.). Analyses carried out a comparative sense (different taxa) as well with respect to eggs same species, or even laid by female. In addition understandable differences particular considerable observed regards originating from extreme cases female reached up 11 percentage points (linear...

The effects of a magnetic field (1, 3 and 5 mT), applied during short- 3, 5, 30 60 minutes) long-term (from the beginning embryogenesis) exposure, on melanophores European whitefish, Coregonus lavaretus vendace, albula, were investigated. Short-term exposure behaviour at stage when eye body pigment whitefish vendace distinctly visible in embryos. short-term embryo to fields induced cells move central parts cells. In control, we did not observe displacement within melanophores. was found...

AbstarctMagnetic field affects many living organisms, fishes included. The fish reactions are observed from the early stage of development, during embryogenesis and larval period, into adult stage. Magnetic affects, among other processes, water exchange in eggs, embryo heart rate respiration, directional spatial orientation. few papers this published so far present melanophores morphology development. Melanophores developing embryos newly hatched sea trout (Salmo trutta m. L.) larvae which...

Trout (Salmo trutta L.) and rainbow trout (Oncorhynchus mykiss Walb.) embryos developing in eggs incubated the geomagnetic field are oriented NW-SE. Artificial horizontal magnetic fields of 0.5 1.0 mT, i.e., higher than that natural one but same direction resulted a changed alignment examined. The placed those artificial were aligned N-S NE-SW. A 90° clockwise rotation poles, relative to one, embryos′ orientation being

The potential of artificial hideouts, outfitted with magnets or their imitations (control), to attract spinycheek crayfish Orconectes limosus was studied. experiments were carried out within 1999-2002 in an 80-hectar natural lake. There three parallel setups, experimental treatments (hideouts) each. presently acquired results suggest explicitly that the magnetic field generated at entrance hideouts (made ceramic pipes), affects movement direction crayfish. This evident from statistically...