Abstract
The fish fauna of the River Hernád was examined in 24 sampling sites in summer of 2014. As a result of the survey 31 species were detected of which eight are protected and three are highly protected by law in Hungary. The presence of the adventive tubenose goby (Proterorhinus semilunaris) in the estuary of the Hernád was observed for the first time by us. The most frequently detected species (with 100% frequency of occurrence, FO) were the chub (Squaliuscephalus), the bitterling (Rhodeusamarus) and the bleak (Alburnusalburnus), in addition the bleak was also the most dominant fish of the river. The hydraulic works have detrimental effect on the number of species and specimens and on the diversity of the fish fauna as well. The natural sections of the River Hernád have the most diverse fish assemblages.
Highlights
The fish fauna of the River Hernád was examined in 24 sampling sites in summer
in the estuary of the Hernád was observed for the first time
Mindösszeháromfaj,aküsz(Alburnus alburnus), adomolykó(Squalius cephalus) ésaszivárványosökle (Rhodeus amarus) fordultelőminda24mintavételi egységben.Négyhalfajnak,azezüstkárásznak(Carassius gibelio),apontynak(Cyprinus carpio),atarka gébnek(Proterorhinus semilunaris) ésanémetbucónak(Zingel streber) csupánegy-egyvizsgáltfolyószakaszonészleltükpéldányait.ApontykivételévelmindhárommásikfajaHernádalsó,Hernádkakalattiszaka- szánfordultelő
Summary
The fish fauna of the River Hernád was examined in 24 sampling sites in summer of 2014. Azembertöbbmódonishatássalvanhidrogeológiai környezetére,amelyeklegszembetűnőbbpéldáiavízfolyásokon kialakított keresztműtárgyak (pl. fenékküszöbök,gátak).Ezekszereperészbenamezőgazdasági(elsősorbanöntözési)célúvízvisszatartás,amederesésbőladódóáramlásisebességcsökkentése,vagya villamosenergia-termelés. A Hernád Szlovákia területén ered Hernádfőnél, MagyarországraKékedközigazgatásiterületénlépbe.
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