Nothing compares to the CH on this level.
I agree, which was the point I was hinting at.

My point was that no matter what's happening in the fishing industry, the decline alone isn't indicative of the need to step in. Industries change for all kinds of reasons.
Yes they do. Some reasons are acceptable and inevitable, such as technology. Other reasons are not, such as external imposition of quotas. There's no reason why fishing should go the same way as farming, because technology is not the problem. The demand is still there, the fish are there, and the way to catch the fish is to take boats into the water with nets. The argument is that British waters should belong to Britain, not Europe. This isn't comparable to the combine harvester.

What's their proposed change? That seems to go against what their politicians say will happen if they get what they're protesting for... so something's not in line.
If anyone is suggesting that reclaiming control of our waters will not improve the economies of fishing communities, they are lying. That should be obvious. More fish at British markets means more income for fishermen. Obviously.

AND Politicians know that whatever happens with Brexit isn't going to affect the change the fishermen want.
Politicians are insincere, they are not to be trusted on such issues. They simply pick a side and then try to get votes. Very few politicians have integrity. This is a major flaw with democracy, more so than stupid people voting. Politicians care more about votes than what's actually in the best interest of the country.

In Holland, yeah. Doesn't speak to there being a market in the UK, though.
This doesn't make sense. The Dutch aren't taking less fish than we would. If they were, the sustainability argument has some merit. But nobody has said to the UK "you can't fish there because you're irresponsible, we're letting the Dutch do it instead".