Everything that has been mentioned is a contributing factor. Commercial fishing, especially trawling is the single biggest factor in offshore fisheries and total breeding stock, but with regard inshore fisheries, more anglers are targetting less fish, especially from pleasure boats in the summer. I've observed dozens of boats on the same day off Boulmer and Longhoughton Steels last year jiggin for hours literally 1/2 mile off shore. Times that by 7 days a week for a season lasting a couple of months then it makes a hell of an impact. Then think off that up and down the coast. I've also noticed a massive difference in the quantity of flatfish caught in our club. Think I've seen 2 weighed in this year compared to dozens over previous years (all kept alive in bait buckets and then released). Any explanations for that? My personal opinion is the amount targetted during 'opens', with the pressure on to get as much weight as possible for the top prize money. Not fished an open in years so am n ot sure if people bring them back in buckets or not, so that theory may be co-incidental if someone who regularly attends 'opens' especially the weigh-ins could comment.
Pipefish I'm unsure of, yes I've seen a couple this year though all of the fish I've had this season have had crab, squat lobster or differing small fish in them.
Again seals have been a bug bear of fisherfolk since time eternal, but any thing that competes with man for food is going to cause conflict. Nature is self sustaining, so if there were hardly any fish then the seal population would be affected also, but from what I can see the seal population is growing and the health of the colonies are in good condition. If there were no fish the seals would be dying of starvation in their hundreds.
The haddock stories mentioned of 30 years ago is a possible explanation of why they are probably not seen in the quantities they once were. sessions where hundreds were caught. If one guy was going out catching dozens of fish,then chances are there were hundreds, possibly thousands of anglers out doing the same.
Crappy weather hasn't helped this year either.