wet fish 
noun [mass noun]
Fresh fish, as opposed to fish which has been frozen, cooked, or dried: [as modifier]: wet fish stall...
- The company is involved in hake and lobster fishing and owns three wet fish trawlers.
- Frankly, this is a pretty big blade and a very cold wet fish and my sheer ineptitude, coupled with nerves, means that the fillet of mackerel sadly ends up looking like a biopsy of tripe.
- Mrs Johnson said he worked at the Co-op's wet fish shop in Rosemary Road for a time and managed to pick up a speeding fine while riding his trade bike.