Ichthyophthirius multifilis (ciliate)

Question 1

DH

Answer 1

fresh water fish

Question 2

IH

Answer 2

None

Question 3

Stages of life cycle include what 4 things?

Answer 3

Tomonts, tomites, theronts, trophonts

Question 4

Explain the rule of tomonts

Answer 4

cyst stage in water, binary fission within the tomont producing tomites

Question 5

Explain the rule of theronts

remember, this is the inf. stage of DH

Answer 5

motile, ciliated, “Swarmers” -penetrate epithelium and develop into Trophonts*

Question 6

What is the only stage that is targeted by chemotherapy??

Answer 6

THERONTS

Question 7

Explain the rule of Trophonts

Answer 7

parasitic stages; motile, ciliated, horseshoe macronucleus, mature on fish and drop off into the water to encyst (tomonts)

Question 8

Infective stage for DH:

Answer 8

THERONT

Question 9

Site of infection:

Answer 9

Gills, fins, skins

Question 10

Route of infection

Answer 10

Water transmission

Question 11

PPP

Answer 11

N/A

Question 12

CRYPTOCARYON IRRITANS: MARINE FORM OF THE DISEASE - explain the rule of temp

Answer 12

o ideal temp is 24-27C

o Completion of the life cycle is temperature dependent, at lower temperatures, tomite development is delayed

Question 13

Treatment regime targets the ___ stage

Answer 13

theront

Question 14

Clinical signs

Answer 14

white spot disease, “Flashing”, lethargy, anorexia, death, epithelium erosion, sloughing of epidermis and necrosis, ulcerations