Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 15

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
EN
A list is presented of metazoan parasites that infect seven gobiid fishes (the toad goby Mesogobius batrachocephalus, monkey goby Neogobius fluviatilis, racer goby N. gymnotrachelus, bighead goby N. kessleri, round goby N. melanostomus, ratan goby N. ratan, and syrman goby N. syrman) from the Dniester Estuary (Black Sea). Infections by thirteen species of metazoa parasites, including four trematodes, three cestodes, five nematodes, and one crustacean species, were observed in the gobies sampled from the estuary. The data complements the existing list of parasite species that inhabit the fishes of this aquatic basin. Water salinity varies in the estuary, which impacts parasite distribution. Brackish-water parasites prevailed in the Dniester Estuary, while the marine trematode C. lingua occurred only in the southern part.
EN
The round goby Neogobius melanostomus and the grass goby Zosterisessor ophiocephalus are most widespread fishes of the Tuzly?s group salty lagoons - Alibey and Burnas (North-Western part of the Black sea, Ukraine). The helminthofauna of these fishes consists of six species of parasites: Cryptocotyle lingua, C. concavum, Acanthocephaloides propinquus, Telosentis exiguus, Contracaecum microcephalum, and Cucullanellus minutus. Trematods of the genus Cryptocotyle, acanthocephalans A. propinquus, and larvae of nematods C. microcephalum are reported from this water area for the first time; the latter from gobies for the first time. The interrelation between infection of fishes and biology of helminthes and their host is discussed. This is the first study containing the complete information on the parasite fauna of the Lagoons.
EN
Parasites of the round goby in the North-Western Black Sea region and the Gulf of Gdask have been investigated. Only Acanthocephalus lucii that infect the round goby from the Black Sea were found in one specimen from the Baltic Sea. A lot of the round goby's parasites are fresh water species (Diplostomum spp., A. lucii, Ergasilus sieboldi). The round goby's parasites which are most widespread in the Black Sea (Cryptocotyle spp., Dichelyne minutus) do not infect the goby in the Baltic Sea but are present for other fishes (Gobius niger, Platichthyes flesus). It is possible that the Baltic population of the round goby have a fresh water origin, because independently of the fact that marine parasites, Cryptocotyle concavum and D. minutus, inhabit the Gulf they do not infect the round goby.
EN
The aim of the present work was to investigate the helminth fauna of commercially caught gobiid fishes (Zosterisessor ophiocephalus, Neogobius melanostomus, N. fluviatilis, N. syrman) of the Budaksky Lagoon. The studied fish harbored nine parasite species that include three Holarctic species, one Euro-Siberian, one Cosmopolitan species, one Boreo-Atlantic species, one Mediterranean species, and two Ponto-Caspian ones. The most widespread species were: Cryptocotyle lingua, C. convacum, Acanthocephaloides propinquus. Two Ponto-Caspian cestod species: Proteocephalus gobiorum, Ligula pavlovskii are specific for gobiids. Possible reasons of the infection variability were discussed. Eight species of helminths have been recorded for the first time in the Lagoon.
EN
Morphological data for Acanthocephaloides propinquus (Arhythmacanthidae) from gobiid fishes from the northwestern Black Sea are presented. Individuals from the Black Sea differ from the descriptions based on Mediterranean specimens in having 4–5 proboscis hooks per row in the former and 5–6 in the latter. The size of the cuticular spines is rejected as a diagnostic character for A. propinquus because their length varies in a wide range (3.0–7.5 µm). The diagnostic characters for identifying A. propinquus include the presence of small culticular spines, the testes located in the central part of the body and an acanthor having a single hooklet lacking a root.
EN
Background. Fishes of the family Gobiidae may be definitive-, intermediate-, or paratenic hosts of parasites with mature stages infecting a variety of vertebrates, including humans. This group of fishes constitutes a convenient ecological model for studying the processes of colonisation by parasites. Learning these processes may contribute to a better, more complex, understanding of organismal interrelationships within respective habitats. The aim of this study was to compare the helminth infection levels of different gobiid species in the north-western Black Sea (NWBS). Materials and Methods. The fishes were sampled within 1996–2003 at different seasons (excepting winter) in the NWBS. A total of 2102 specimens of 10 goby species—the black goby, Gobius niger, the knout (toad) goby, Mesogobius batrachocephalus, the mushroom goby, Neogobius eurycephalus, the monkey goby, N. fluviatilis, the round goby, N. melanostomus, the ratan goby, N. ratan, the syrman goby, N. syrman, the marbled goby, Pomatoschistus marmoratus, the tubenose goby, Proterorhinus marmoratus, the grass goby, Zosterisessor ophiocephalus—were examined for helminths. The Czekanowski–Sørensen index (Ics) was used for comparing the helminth faunas. The infection indices were compared using the discriminant analysis. Results. The fishes examined yielded a total of 24 helminth species. Four parasite species were common for all hosts surveyed: Cryptocotyle concavum MET, C.lingua MET, Dichelyne minutus, and Acanthocephaloides propinquus. Telosentis exiguus infected six host species, Eustrongylides excisus—five of them, while Pygidiopsis genata Streptocara crassicauda L3 were found in four gobiids. Five parasites species (Proteocephalus gobiorum, Asymphylodora pontica, Acanthostomum imbutiformis MET, Raphidascaris sp. L3, and Streptocara crassicauda) were common for three host fish species, while another four helminths (Bucephalus polymorphus MET, Nicolla skrjabini, Contracaecum rudolphii L3, and Acanthocephalus lucii) were found in two gobiids only. A total of ten parasite taxa were found to infect single hosts species (Bothriocephalus gregarius PL, Ligula pavlovskii PL, Proteocephalus gobiorum PL, P. subtilis, Proteocephalus sp. PL, Paratimonia gobii, Aphalloides coelomicola, Aphalloides coelomicola MET, Contracaecum microcephalum L3, and Anisakidae gen. sp. L3). The most stable indices of gobiid infection were determined for nematode D. minutus. Conclusion. The observed differences in the species composition of helminth faunas of different gobiids were related to the zoogeographical origin of a host species, the ecological specificity of their habitats (e.g. salinity), and the biology of individual parasites.
EN
Feeding preferences of the round goby and mushroom goby from the Odessa Bay (areas with civil engineering works) were studied. Two goby species were observed to choose different dietary items in dependence of the season and place of fishery. The mushroom goby chose Nereis succinea more intensively than the round goby.
EN
Parasitism of monkey goby, Neogobius fliviatilis, was assessed at three brackish water localities with different salinity levels (Gulf of Odessa, Khadzibey Estuary, Lake Kytay) and one freshwater site along the Lower Danube River (Vidin). A total of 25 parasite taxa were identified, with minimum parasite richness recorded in the Khadzhibey Estuary (three species) and the maximum along the Lower Danube (11 species). Parasite richness in the mesohaline Gulf of Odessa and oligohaline Lake Kytay was lower, but still relatively high compared to the Khadzibey Estuary. Our study indicates that freshwater populations of monkey goby host richer and more abundant parasite communities than those inhabiting brackish waters with (more or less) stable salinity. Unstable abiotic conditions that probably affected the parasite’s intermediate hosts contributed to the reduction in parasite species in the estuarine zone of the Danube.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.