Parasites of three-spined stickleback, Casterosteus aculeatus L, from Faroe Islands - Sníkar í føroyskum kombikki, Gasterosteus aculeatus L

Abstract

Abstract

ln the years 2002-2004 samples of three-spined stickleback, Casterosteus aculeatus L, from Faroe Islands were investigated from six different sites, three marine and three freshwater. Ten parasir.es or disease conditions were found in 1105 fish. The cestode Schistocephalus solidus appeared in freshwater samples only (prevalence of infection 6.4-62.8 %). The nematode Hysterothylacium aduncum (4.3 -5.7 %) and the copepod Thersitina gasterostei (7.4-100 %) were only recorded in marine samples. The ciliate Trichodina sp.(1.7-100 %) and the monogenean Cyrodactylus sp. (1.1-41.8 %) were found in all localities. Of digeneans Diplostomum sp.(5.0 %) was seen in one marine sample and an unidentified species was seen at two localities in freshwater. Diseased conditions found were "fin rot", "white spot disease" and "unidentified cysts." Statistical analyses suggest a significant difference in total parasitofauna between marine and freshwater localities (p<0.01).

Úrtak

Í tíðarskeiðinum 2002-2004 vórðu sýni tikin av kombikki, Casterosteus aculeatus L, á seks støðum í Føroyum: trimum støðum, har salt var í umhvørvinum, og trimum, har einki salt var. Tíggju sløg av sníkum ella sjúkrastøðu vórðu funnin í tilsamans 1105 fiskum. Bendilormurin Schistocephalus solidus varð bert funnin, har einki salt var (6,4-62,8%). Rundormurin Hysterothylacium aduncum (4,3-5,7 %) og krabbadýrið Thersitina gasterostei (7,4-100%) vórðu bert funnin, har salt var í umhvørvinum. Einkyknudýrið Trichodina sp. (1,7-100%) og monogena iktan Cyrodactylus sp. (1.1-41.8 %) vórðu funnin á øllum støðum. Digena iktan Diplostomum sp. (5,0%) varð bert funnin á einum stað, og eitt ónavngreinað slag varð funnið á tveimum støðum, har einki salt var. Funnar sjúkrastøður vóru: "fjaðrarot", "hvítblettasjúka" og "ónavngreiddar bløðrur". Hagfrøðiligar kanningar vístu ein týðandi mun millum sølt og ósølt støð í tali og tíðleika av sníkum (p < 0..01).