May I speak on that?
If you look at the EI Act, the term they use is a “catch”: as long as their product is a catch, then it's EI insurable. But seals are excluded from the term “catch”, so sealing income is not insurable.
However, if a skipper, as you said, creates what's termed an employee-employer relationship, then it can be or may be insurable. However, the crew members cannot take any risk; they have to be employees. He's paying them a salary, I suppose, as opposed to there being a joint venture such as would be the case in other fisheries. It's my understanding--and I'm not involved with other species--that with crab, for instance, in order for that to be insurable, the crew members must take part in the venture. They must share in the expenses of the trip, and then they share in the profits from the trip, and then that becomes insurable. The sealing industry, because it doesn't produce a catch, comes under a different regulation.
I was really surprised when somebody said that 50% is insurable and 50% not insurable. That was a new one for me. If the skipper on a vessel creates what's considered an employee-employer relationship with his crew members, then it can be insurable.