The fishfauna of the Crişul Repede river and its threatening major factors

A tétel rövid nézete
dc.contributor.authorTelcean, Ilie C.
dc.contributor.authorCupşa, Diana
dc.contributor.authorCovaciu-Marcov, S. D.
dc.contributor.authorSas, I.
dc.date.accessioned2021-06-28T10:58:34Z
dc.date.available2021-06-28T10:58:34Z
dc.date.issued2007-04-11
dc.description.abstractThe Crişul Repede River is belonging at Cris (Körös) Rivers system which is a tributary on the left shore of Tisa River. In the last decades the fishfaunaofthenaturalwatershasundergoingadeclineinthespeciesnumber.Theothersuccessiveprocessisthefishspeciesreplacement due by the immigration of some exotically fishesandtheretirementofsomeofthenativespecies. The Crişul Repede fishfaunahasregisteredadeclinecausedmainlybytheriverdamming,waterpollutionandeutrophisation.Ondespite of that negative factors the fishesfromtheupperriverwasmaintainlessaffectedunliketotheotherrivers.Thereaftertheeconomical transition and the industries reorganization process were redounded to diminishing the impact of these harmful factors. The former studies about the Cris fishfaunacitedanumberof48nativespeciesand12exoticones.Duringtheresearchtripscarriedoutsince10yearsago (beginning in 1995) was identifiedanumberof40fishspeciesandthepresenceoftheother8 speciesarestilluncertain.Thesturgeonspecies Acipenser ruthenus and the migratory fishAnguillaanguillahaveascarcepresenceandtheycannotbefoundinthelastdecade.A number of 5 exotically fishesarebehavedasremarkableintrudersinnaturalwaters:Pseudorasboraparva,Carassiusauratusgibelio,Ictalurus nebulosus, Ictalurus melas, and Lepomis gibbosus. Some of the exotically fishesalreadyrecordedintheHungarianstretchesofthe Crisuri (Körös) was not recorded in the Romanian section of the river (Mylopharyngodon piceus, Ictiobus bubalus, Ictalurus punctatus, Clarias gariepinus, Micropterus salmoides, Oreochromis niloticus, Perccottus glenii). The pervading of these species is expecting also in the Romanian section of the rivers. The present major threatening factors concerning the fishfaunaarerepresentedbythehabitatchanges.Theriverdammingandtheriverside levees have a negative influenceonthefishfauna.Theformerphenomenonofwaterpollutionitseemsthatisreplacedbythehabitat changes. The dam lakes caused unregulated fluctuationsonthewaterlevelandtemperaturedownstreamofit.Theembankmentforpreventing the floodingwasperformedthroughshorteningtherivermeander.Thelostmeandersoftheriversarerepresentinganoptimalhabitat for fishspawning.en
dc.formatapplication/pdf
dc.identifier.citationActa Agraria Debreceniensis, No. 25 (2007): Pisces Hungarici I. (Supplement Issue) , 13-18
dc.identifier.doihttps://doi.org/10.34101/actaagrar/25/3031
dc.identifier.issn2416-1640
dc.identifier.issue25
dc.identifier.jatitleActa agrar. Debr.
dc.identifier.jtitleActa Agraria Debreceniensis
dc.identifier.urihttps://hdl.handle.net/2437/316555en
dc.languageen
dc.relationhttps://ojs.lib.unideb.hu/actaagrar/article/view/3031
dc.rights.accessOpen Access
dc.subjectFishfaunaen
dc.subjectthreatening factorsen
dc.subjectCrişul Repede Riveren
dc.titleThe fishfauna of the Crişul Repede river and its threatening major factorsen
dc.typefolyóiratcikkhu
dc.typearticleen
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Acta Agraria Debreceniensis (DE-journals)