The CFP is a farce chris, one of the major problems is as this article points out and you mention how many other boats are fiddling their catch reports.

Anyone in the industry can tell you in Spain the Spanish fishery inspectors are half @r$ed to say the least while in the UK the fishery inspectors come down very hard on fisherman catching over their quota.
The only way I can see to correct this is to scrap the CFP, of course the rest of Europe who are milking the system won't allow it, they like raping British waters and landing their catch elsewhere.
I'm not suggesting it's only Spanish and French fisherman doing the raping, it's not but the CFP has lead to everyone treating our waters as a free for all fishing ground to be dredged clean, no respect or considerations are made for spawning grounds, spawning just makes the mass pillaging of the waters easier.

Food for thought, in the early 1970s Britain's sea fisheries were near on parr with that of Norway, Britain joined (formed) the Common Fisheries Policy Norway didn't join, 35 years later it doesn't take a genius to figure out what our problem is.