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All about Fish Vetting – Dr Richmond Loh
All about Fish Vetting – Dr Richmond Loh
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Dear colleagues,
I am a new grad and new to aquaculture.
Please can I get an opinion regarding the following: a sea based oyster farm has experienced mortalities during our summer period earlier this year, and last year. We don’t have an established surveillance system yet in South Africa, but from the work and testing done by a few scientists and vets, no Oyster herpes virus has been isolated in SA.
An inspection done recently has showed increased mortality according to the attending vet, but most of these in his opinion is from the previous split because a lot of them were quite small.
No samples were taken for testing.
We need to know when would be the best time to do a reinspection, to take samples for testing of the virus, in 3 months time which is our usual protocol if any problem is encountered on a farm, or during Summer when mortalities are high. High temperatures above 16 degrees celsius has been associated with OHV.
The other alternative would be to sample animals now and stress them out for a period after which we can test for the virus. Has anyone done this before and can comment on this method?
Thanks.
Regards,
Sasha
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Any clues on histology? I’d be sampling on a weekly basis, 30 oysters, into formalin, frozen and ethanol to cover all bases. I’d be doing the histology as they come in and conduct further testing on the samples as indicated. Histology is still the best way for investigating new and emerging diseases when you don’t have much to go with.
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