| observations on the occurrence of diplostomum spathaceum and schistocephalus sp. in ninespine sticklebacks (pungitius pungitius) from the belcher islands, northwest territories, canada. | all 175 ninespine sticklebacks, pungitius pungitius (linné), collected from the belcher islands were parasitized by diplostomum spathaceum (rudolphi) and 43% by schistocephalus sp. d. spathaceum metacercariae were mostly confined to a dorso-ventral band encircling the lens of the eye, and were concentrated in the anterio-dorsal sector of this band. the central area of the lens was thus relatively free of diplostomula, probably minimizing interference with the vision of the fish. the frequency di ... | 1981 | 6894622 |