a fish processing vessel entered into service before
January 1, 1988, and not more than 1,600 gross tons as measured under
section 14502 of this title, or an alternate tonnage measured under
section 14302 of this title as prescribed by the Secretary under
section 14104 of this title or entered into service after
December 31, 1987, and having not more than 16 individuals on board primarily employed in the preparation of fish or fish products.