Echeneibothrium canadensis n.sp. (Tetraphyllidea: Phyllobothriidae) in the spiral intestine of the thorny skate (Raja radiata) from the Canadian Atlantic Ocean

1996 ◽  
Vol 74 (8) ◽  
pp. 1590-1593 ◽  
Author(s):  
Christopher P. Keeling ◽  
Michael D. B. Burt
Keyword(s):  
Atlantic Ocean ◽  
Spiral Intestine ◽  
Raja Radiata

From a study of 124 skates (Raja radiata Donovan, 1808) in the Canadian Atlantic Ocean, Echeneibothrium canadensis n.sp., is described, and the nomenclatural confusion of this species with E. variabile Van Beneden, 1849 is discussed. Echeneibothrium canadensis n.sp. is most closely related to E. variabile and other members of the genus with a large, robust myzorhynchus but is differentiated by possessing 12 distinct loculi within each bothridium, a large robust myzorhynchus, 18–26 testes per proglottis, and an armed cirrus and vitellaria extending posterior to the ovary.

Blood protozoans of fish from the Davis Strait in the northwestern Atlantic Ocean

1991 ◽  
Vol 69 (2) ◽  
pp. 410-413 ◽  
Author(s):  
R. A. Khan ◽  
E. M. Lee ◽  
W. S. Whitty
Keyword(s):  
Atlantic Ocean ◽  
Fish Species ◽  
The Other ◽  
Baffin Island ◽  
Grand Banks ◽  
Northern Latitudes ◽  
Davis Strait ◽  
Reinhardtius Hippoglossoides ◽  
Raja Radiata ◽  
Hippoglossoides Platessoides

A study was carried out to determine the occurrence and prevalence of blood protozoans in benthic marine fish from the Davis Strait, an area between Baffin Island and Greenland (61–70°N, 53–63°W) in the northwestern Atlantic Ocean. Parasites were seen in all 17 species offish examined; piroplasms were most prevalent (78% of 413), infecting all fish species. Prevalences of infection were substantially lower for trypanosomes (23%) and haemogregarines (4%), both of which infected only 10 and 6 of the fish species, respectively. Prevalences were greater in 5 of the fish species examined, Reinhardtius hippoglossoides, Hippoglossoides platessoides, Lycodes lavalaei, Macrourus berglax, and Raja radiata, than in the other 12 species. Though the prevalence of trypanosomes decreased considerably in the most northerly of three areas, no differences were apparent for piroplasms. Prevalences noted in this paper are comparable to those observed in fish taken off the coast of Labrador but considerably greater than those of the Grand Banks or in areas south of latitude 50°N. Based on occurrence and prevalence, it is likely that fish haematozoans and their leech vectors originated in the northern latitudes and radiated southwards.

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