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Fish may have bacteria, viruses, parasites and other disease causing organisms. Unfortunately, fish can pass directly from the fishermen to the consumers without being processed by a regulatory body. Of late there was an global breakout of SARS (Severe Acute Respiratory Syndrome) which spread with the through chicken. If such a problem emerges with fish it would take a longer time to detect because fish are not as strictly regulated as chickens. Every commercial chicken farm needs to be registered with some regulatory body while it is not at all necessary for the fishermen to register themselves with any regulatory bodies in some cases.
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