This is no different than poaching!
Above is a recent picture from the Yellow Sea of Chinese fisherman illegally attempting to fish there. The boats are tied together in an attempt to increase the difficulty of SK authorities apprehending a single vessel. Read the source link for the whole story.
From the Daily Mail:
Source -> http://www.dailymail.co.uk/news/article-2062787/Chinese-fishermen-caught-South-Korean-waters-try-escaping-armed-coastguards--tying-boats-rope.html