Not only the reasons you give, Geri but also that the UK fish quotas were sold to other European countries by the UK government(s) and UK boat owners. The quota is assigned to a boat. If the boat is sold to a non-UK national the quota goes with the boat. It seems that both UK governments and the UK fishing industry itself has been complicit in the demise of our fishing industry.
Of course, it hasn't helped that the MEP who was a member of the EUP Fisheries committee and who should have represented our interests there was one Nigel Farage, who attended only 1 of 42 meetings and who had absolutely no interest whatsoever in helping the UK fishing industry to assert themselves within the EU. His principle interest has been in destroying the EU, not serving the interests of the UK within it.
How he had the brass neck to portray himself as the UK fishermans' friend and arrange that pre-referendum charade of fishing boats on the Thames is beyond words. And how the fishermen didn't see straight through him will be an eternal mystery.
This, from the Independent,( in happier days pre-referendum, 1996)
This is complex but it is vital to an understanding of quota-hoppers. In the early Eighties, there were a couple of dozen. Their numbers exploded during the decade. Why? Because British trawler owners sold their boats to the Spanish and Dutch. Or in some cases they sold them to British brokers, who sold them to the Spanish and Dutch. Why? Because they were offering the best price.
The main alternative - EU scrapping grants - were not on offer in Britain. Why were the foreign skippers so keen to buy British boats? Because under British, not EU, regulations, if you bought the boat, you also got the licence to fish and a guaranteed share of the national quota.
It is a purely British government policy to break down the national quota boat by boat, and allow the sale of quotas, in this way. Other EU governments have other ways of enforcing (or in some cases failing to enforce) the Common Fisheries Policy.
www.independent.co.uk/news/uk/britains-fishy-role-in-the-quota-hopping-scandal-1315516.html