Ichthyophthirius multifiliis: observations on the life-cycle and indications of a possible sexual phase

Title:

Ichthyophthirius multifiliis: observations on the life-cycle and indications of a possible sexual phase

Creator:

Matthews, Richard A., Matthews, Brenda F., and Ekless, Louise M.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:5c4936b7-1f1e-4480-b0b4-922919d18d54
uuid:5c4936b7-1f1e-4480-b0b4-922919d18d54
urnnbn:urn:nbn:cz:aba007-000dlu

Subject:

Ichthyophthirius multifiliis, senescence, conjugation, and anisogamy

Type:

model:internalpart and TEXT

Format:

print

Description:

Theronts of the ciliate Ichthyophthirius multifiliis (Fouquet) with up to 4 micronuclei were recorded in populations from two different parasite isolates, maintained as primary infections in juvenile carp through 2 and 10 cycles, respectively. The largest number of multimicronucleate forms occurred within the older isolate (10 cycles) following cyst incubation at 20"C. Tro-phonts were induced to emerge from the host epidermis following incubation of the fish in Eagles MEM for 10-15 min at 20"C. This provided for the first time a technique to recover trophonts in all stages of development; observations were made on the transition from theront to trophont, with respect to nuclear events, the organelle of Lieberklihn, and phagocytosis of host cells. On re-exposure of carp already carrying a two-day primary infection, recently entered trophonts were found in various stages of fusion with established parasites. Results are discussed with respect to conjugation, anisogamy and senescence.

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

203-208 and 45-50

Source:

Folia parasitologica | 1996 Volume:43 | Number:3

Harvested from:

CDK

Metadata only:

false