Fish
Make sure that fish gills are reddish and eyes are clear and not foggy
Squid
Hold its skin and try rubbing it. If the skin holds tight and doesn't get easily cut then its fresh
Mussel
When buying mussels see to it that it's not open and it does not float on water. If it floats then its not fresh.
Shrimp
In buying Shrimp make sure its skin is more dark in color. Because lighter skin color is the result of being frozen for few days
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