What are factors that may cause contamination of fish at place of sale?!
Answers: Fish that you eat not pets
If the sale area is not clean, the fish are not properly wrapped or stored in a place that is too warm, or the meat handlers are unhygienic, that may cause contamination.
Touching by human hands that are carrying all sorts of bacteria and viruses. Even if you wash your hands, and the workers wash their hands, there is still the money exchange which can pass on germs!
Kept at improper temperature (too warm)
Not kept on top of ice (i.e. sits in melted water)
Flies
Exposure.
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If the board it is placed on, or the utensils it is touched with, previously came into contact with raw beef, pork or poultry.