The same sampling procedures as in Bacteriology apply here. Live fish are preferred to frozen or preserved fish. This is especially true for detection of external protozoan parasites and general gross tissue lesions, which are usually lost during freezing. Fish may be fixed in 10% buffered formalin if live fish are not available. Fish longer than 6 cm should be opened along the abdomen to ensure adequate formalin fixation of all tissues. The FPS will not routinely process large numbers of fish ( 20) for purposes of establishing parasite (helminth) prevalences.
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