Quota hopping occurs when owners from one country buy ships and obtains a fishing license in another country and fishes against the latter's international quota.
http://lib.s.kaiyodai.ac.jp/library/kiyou/ron3902.pdf
Quotas implemented in Europe are subjected to quota hopping. A common example is a fishing company in Spain that registers its fleet in the UK and fishes under the UK flag, using the UK's quotas. Britain tried to pass a law limiting the number of international fleets registered to 25%, but the EU declared that the law conflicted with the people's right to establishment.