The batch is the unit of account for the whole house. Raw fish, brine, smoking run and packing must always carry the same number, or a market recall becomes impossible to execute.
Yield varies and decides the margin. A fish loses weight in the cure and again in the smoke, and without that figure per batch the sums use the purchase weight.
The cold chain wants evidence, not recollections. Temperatures per chamber and per delivery have to log themselves, because that is precisely what an inspection asks for.
The use-by date is born of the production date, not of the label printer. Keeping the two apart eventually puts wrongly dated goods on a shelf.
Christmas is a second company lasting four weeks. Pre-orders, gift boxes and delivery windows are organised before the first order lands, not during.
Direct sales and wholesale never share a price for the same piece of fish. Two price lists per item settle it for good, and without them the argument ends up happening on the loading bay.