ON THE BIOLOGY OF PROTEOCEPHALUS PARALLACTICUS MACLULICH (CESTODA) IN ALGONQUIN PARK, CANADA
1964; NRC Research Press; Volume: 42; Issue: 3 Linguagem: Inglês
10.1139/z64-035
ISSN1480-3283
Autores Tópico(s)Parasite Biology and Host Interactions
ResumoProteocephalus parallacticus MacLulich is common throughout the year in lake trout (Salvelinus namaycush). Beginning in late May or early June and continuing to early autumn, gravid worms occur throughout the summer in approximately 25% of the trout 3 to 4 years old or older. Plerocercoids may develop within 30 to 40 days at 16 °C in Cyclops bicuspidatus, C. vernalis, and probably C. scutifer, but not in several other copepods which were tested; female C. bicuspidatus are most suitable. Normal growth is rare in copepods at 20 °C, and probably little growth occurs below 10 °C. In the gut of the trout plerocercoid I, the plerocercoid from the copepod, requires at least 30 to 40 days at optimal 12 °C to grow to plerocercoid II, which is morphologically identical to but approximately 10 times larger than plerocercoid I; in another 35 days or less plerocercoid II segments and grows to a gravid adult. The maximum temperature for growth is approximately 14 °C, and growth is slow below 10 °C. Trout may be infected directly with plerocercoid I from the copepod, or with plerocercoids varying from I to II taken from the gut of other fish. Thus the plerocercoid of P. parallacticus has two phases of growth, one in the copepod and the other in the fish. The latter occurs within the gut rather than parenterally as with P. ambloplitis.
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