service performed by an individual in (or as an officer or member of the crew of a vessel while it is engaged in) the catching, taking, harvesting, cultivating, or farming of any kind of fish, shellfish, crustacea, sponges, seaweeds, or other aquatic forms of animal and vegetable life (including service performed by any such individual as an ordinary incident to any such activity), except—

(A) service performed in connection with the catching or taking of salmon or halibut, for commercial purposes, and

(B) service performed on or in connection with a vessel of more than 10 net tons (determined in the manner provided for determining the register tonnage of merchant vessels under the laws of the United States);