"It's a hard existence. There is a reasonable amount of risk, they're away from home on a small vessel, living conditions aren't necessarily fantastic, and their ability to enjoy some of the other things in life, like play rugby, tends to become quite difficult.
"I just don't think younger people are prepared to make that commitment."
Or, to put it another way: if you are crew on a fishing boat, you don't get to have a life, or friends, or a partner. There's just a job, which pays the princely sum of $50,000 a year. Which you can get on land, without the danger or the long hours or the shit working conditions which stop you from having a life.
So yeah, its not surprising at all that no-one wants to work for them. And that's without considering the industry's reputation for being full of criminals and using slave labour. Like farming, its an industry that no-one who is not already part of their cult would ever want to be a part of.