Difference between revisions of "Ornamental Fish Q&A 17"

Latest revision as of 22:30, 30 October 2011

This question was provided by Manson Publishing as part of the OVAL Project. See more Ornamental Fish Q&A.

Question	Answer	Article
What are the organisms seen in the photograph?	These organisms were found in the eye of a marine fish. They are metacercariae of the eye fluke (Diplostomum sp.).	Link to Article
With what clinical lesions are they associated?	As its common name suggests, this organism has a predilection for the eye and may cause cataracts and blindness. The life cycle is completed when the secondary host in which the metacercariae are encysted is eaten by the specific primary host higher up the food chain.	Link to Article

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-[[|centre|500px]]
+{{Manson
+|book = Ornamental Fish Q&A}}
+[[File:Ornamental Fish 17.jpg|centre|500px]]
 <br />
-'''A group of goldfish were purchased. Because construction of their pond had not been completed, the owner elected to house them in galvanized steel tanks that he borrowed from a friend. After three days the fish began to die.'''
-'''Water quality parameters were as follows:'''
-:'''Dissolved oxygen: 7.0 p.p.m.'''
-:'''Total ammonia nitrogen: 3.0 p.p.m.'''
-:'''Temperature: 26°C (78.8°F)'''
-:'''Nitrite: 0.5 p.p.m.'''
-'''A fish that had just died was collected by the owner and brought in for necropsy. Gill and skin biopsies were negative. A bacterial culture taken from the posterior kidney showed no growth after 48 hours at 25°C (77°F).'''
 <br />
-<FlashCard questions="3">
+<FlashCard questions="2">
-|q1=Which heavy metal can leach from galvanized steel and cause mortality in fish?
+|q1=What are the organisms seen in the photograph?
 |a1=
-Zinc toxicity is commonly associated with fish mortality after housing in a galvanized steel tank.
+These organisms were found in the eye of a marine fish. They are metacercariae of the eye fluke (''Diplostomum sp.'').
-|l1=
+|l1=Diplostomum spathacaeum
-|q2=How would you confirm your diagnosis?
+|q2=With what clinical lesions are they associated?
 |a2=
-When a toxin is suspected, efforts should be made to confirm the presence of the suspect contaminant in the environment and in tissue of affected fish.
+As its common name suggests, this organism has a predilection for the eye and may cause cataracts and blindness. The life cycle is completed when the secondary host in which the metacercariae are encysted is eaten by the specific primary host higher up the
+food chain.
-State veterinary diagnostic laboratories are usually able to perform these assays at a reasonable cost. In the situation described, a water sample from the tank should be frozen in an inert plastic bottle.
+|l2=Diplostomum spathacaeum#Clinical Signs
-A few freshly dead or moribund fish should be frozen in a plastic bag.
-These samples should then be submitted to the appropriate laboratory for analysis.
-|l2=
-|q3=How would water quality parameters affect the situation?
-|a3=
-Toxicity of zinc to fish varies dramatically between different species of fish and water quality parameters.
-A number of studies have reported 96-h LC50 data in the range of 0.87–40.90 p.p.m. Zn2+ in water.
-In general, zinc toxicity increases as water temperature and pH increase, and total hardness decreases.
-|l3=
 </FlashCard>

Difference between revisions of "Ornamental Fish Q&A 17"

Latest revision as of 22:30, 30 October 2011

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