Ormers ("Haliotis tuberculata") are considered a delicacy in the Channel Islands and are looked after with great eagerness by the locals. Unfortunately, this has led to a huge decrease in numbers since the second half of the 19th century, and 'ormering' is now strictly regulated in order to keep stocks. The taking of ormers is now restricted to a number of 'ormering tides', from the January 1 to April 30, which happen on the full or new moon and two days after that. No ormers may be taken from the beach that are under 8 cm in shell length. Gatherers are not allowed to wear wetsuits or even put their heads underwater. Any breach of these laws is illegal and can lead to a large fine. The demand for ormers is so big that it started the world's first underwater arrest, when Mr. Kempthorne-Leigh of Guernsey was arrested by a police officer in full diving gear while illegally diving for ormers.