|
Diagrammatic
representation of established life history of Haidadinium icthyophilum. |
|
A
|
Primary
vegetative cyst on fish host. |
|
B
|
Vegetative
cyst undergoes repeated asexual fission producing cysts as small as 20m
m. At each division the theca is shed (eleutheroschisis). Vegetative cysts
give rise to a variety of other life history stages, including: |
|
C
|
At
55m m or less, paired daughter cysts may form swarmers, which emerge by
shedding the theca. Swarmers can infect a host fish |
|
D
|
Palintomic
reproduction within a vegetative cyst produces aplanospores. |
|
E
|
Multinuclear
resting cyst. |
|
F
|
Spheroidal
amoeba. |
|
G
|
Lobose
amoeba. |
|
H
|
Rhizopodial
amoebae |
|
I
|
Trophont
stage develops by extension of stalk like structure that attaches to filamentous
alga. The mechanism of re-entry into the life cycle is not known for stages
D-I. |
