"Rule, Britannia, Britannia rules the waves," goes a classic British song — and this rule extends beneath the waves, too. The sovereign has dominion over a variety of aquatic animals in British waters.
The Queen still technically owns all the sturgeons, whales, and dolphins in the waters around the UK, in a rule that dates back to a statute from 1324, during the reign of King Edward II, according to Time.
According to the article: "This statute is still valid today, and sturgeons, porpoises, whales, and dolphins are recognised as 'fishes royal': when they are captured within 3 miles (about 5 km) of UK shores or wash ashore, they may be claimed on behalf of the Crown. Generally, when brought into port, a sturgeon is sold in the usual way, and the purchaser, as a gesture of loyalty, requests the honour of its being accepted by Elizabeth."
The law is still observed: In 2004, a Welsh fisherman was investigated by the police after catching a 10-foot sturgeon, the BBC reported at the time. The Scottish government also issued guidance on the law in 2007, writing that "the right to claim Royal Fish in Scotland allows the Scottish Government (on behalf of the Crown) to claim stranded whales which are too large to be drawn to land by a 'wain pulled by six oxen.'"