20-Year Prospect
We know what you're thinking. Working in a fish hatchery is pretty much just helping fish date. So, like dating in the digital age, most of the fish are going to be transferring over to Tinder, or OKCupid, or something like that. Your job is done.
Well, the profession is changing, but not in such a cool way. Sorry if you were hoping for pages and pages of fish trying their best seductive faces and listing their interests like, "shiny objects," "drowning bugs," and "never walking on the beach."
The modern plague on jobs is automation, and fish hatcheries are no exception. There are fewer and fewer things that hatchery technicians are doing that a machine can't do. We're not even talking about a distant future of robot-assisted fish breeding. We're talking right around the corner. There's probably already a robot with candles, a little Barry White, and caviar. Okay, probably not caviar.
There's already been a sharp decline in the job and we're not even automating extensively yet (source).
These figures are showing no sign of slowing down, and are in fact declining for nearly everything to do with fish (source). If you're fine getting more into machine operating than hands-on fish wranglin', then you might be alright. But as time goes on, jobs in this field will be diminishing.