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Corynosoma Acanthocephalans in their paratenic fish hosts in the northern Baltic Sea

机译：Corynosoma Acanthocephalans in their paratenic fish hosts in the northern Baltic Sea

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摘要

Cystacanih stages of three Corynosoma (Acanthocephala) species, C. sirumosum and C. semerme, and a new species in the Boihnian Bay, C. magdaleni, were studied in the fourhorn sculpin (Myoxocephalus quodricornis) in 1996-1997. The length of the drunk and proboscis differentiated the three species in the fish. The stability of the Corynosoma infection was studied by comparing the present results with those collected from the same areas (central cm coastal) in 1977-1982 (Valtonen, 1983a). As C. magdaleni and C. strumosum were not separated at that time, the joint infections of these two species (called "C. strumosum") were compared, The stability of infection with C. semerme in the central Bothnian Boy was noticeable (prevalences were 82.9 in earlier period and 81.9 in later period), while the prevalences of "C. sirumosum" in the some areas had decreased (21 and 13.5 , respectively). This is suggested to be due to the disappearance of the marine bull-rout, Myoxocephalus scorpius, from, the Bothnian Bay during the 1990s due to an overall decline in salinity throughout the Baltic Sea. In the coastal area Corynosoma infection was clearly lower than in central area in both Periods.

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