Июн 26 2002

Biodiversity Of Gobiids’ Helminthes

BIODIVERSITY OF GOBIIDS’ HELMINTHES

IN THE NORTH-WESTERN BLACK SEA REGION

AND ITS CHANGING

Yu. Kvach

Odessa Branch of the Institute of Biology

of the Southern Seas NAS Ukrainе

Gobies are fishery species in the North-Western Black Sea. Cases of Ponto-Caspian endemics invasion to other water areas are mentioned now. So the Ponto-Caspian gobiids (Neogobius melanostomus, N. fluviatilis, Proterorhinus marmoratus etc.) are noted for the Baltic basin and in the Grate Lakes. The knowledge of the gobies’ parasitofauna could be useful for identification of invaders nativity.

The study was carried out from 1996 to 2001. The fish were caught in the Odessa Bay, Tyligul, Hryhoryivsky, Khadzhibey, and Dniester Estuaries, Budaksky and Tuzly’s Lagoons. In total 2178 gobies of 8 species (round goby, N.melanostomus, ratan goby, N. ratan, syrman goby N. syrman, monkey goby, N. fluviatilis, toad goby, Mesogobius batrachocephalus, grass goby Zosterisessor ophiocephalus, and tubenose goby Proterorhinus marmoratus) were examined for helminthes. The faunae were compared using Czekanowski-Sоrensen Index.

The helminth fauna of gobies consists of 20 species. Seven of these parasite species belong to Digenea classis (Bucephalus polymorphus met, Cryptocotyle concavum met, C. lingua met, Pygidiopsis genata met, Acanthostomum imbutiformis met, Asymphylodora pontica, Nicolla skrjabini), 3 species – Cestoda (Ligula pavlovskii l., Proteocephalus subtilis, P. gobiorum), 7 – Nematoda (Eustrongylides excisus l., Contracaecum microcephalus l., Contracaecum rodolphii l., Raphidascaris sp. l., Anisakidae gen. sp., Dichelyne minutus, Streptocara crassicauda l.), 3 – Acanthocephala (Acanthocephaloides propinquus, Acanthocephalus lucii, Telosentis exiguus). Most widespread are representatives of Heterophyidae family (Cryptocotyle spp. met, P. genata met), nematods D. minutus, and acanthocephalans A. propinquus.

Among helminthes dangerous for human larvae of Cryptocotyle spp., Pygidiopsis genata, Eustrongylides excisus must be mentioned. Also the acanthocephalans Acanthocephaloides propinquus, Telosentis exiguus and nematods Streptocara crassicauda l. are not dangerous for human health, but have economical importance. Acanthocephalans cause the intestine occlusion, so negatively impact on fish organism, but streptocara cause the death of poultries that consume the infected fish.

The gobiids’ helminthofaunae of most of studied water areas are changed considerably. The most stable is helminth fauna of the Hryhoryivsky Estuary. In the Khadzhibey Estuary the gobiids’ helminth fauna are changed in full that caused by desalinating of the water body. Inside out changing of the helminth fauna of gobies in the Tyligyl Estuary caused by increased salinity.

The succession of the gobiids’ helminthofauna is noted in the Khadzhibey Estuary during the study. Marine species such as T. exiguus, D. minutus, was disappeared in the fauna but limnetic E. excisus l., A. lucii are appeared. In contrast to published data the helminth fauna are changed in full (Czakanowski-Sorensen Index are 0%). The desalinating of the water body might be noted as an important factor that caused the fauna changing.

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