Abalone

Abalone (from Spanish Abulon) are shellfish, a genus of gastropods.
Abalone are known by their colorful "pearlescent" inside shell. This is also called ear-shell, ormer in Guernsey, abalone in South Africa, and paua in New Zealand.
The meat of this shellfish is considered to be a delicacy in some parts of Latin America (especially Chile), South East Asia, and East Asia (especially in China, Japan, and Korea).
Description
Abalones live all over the world. They can be seen along the waters of every continent, except the Atlantic coast of South America, the Caribbean, and the East Coast of the United States. Most abalones are found in cold waters, along the coasts of New Zealand, South Africa and Australia, and Western North America and Japan in the Northern Hemisphere. On the Chilean Pacific coast, the species called loco ("Concholepas concholepas") has a hard, black shell and is eaten by many people.
Abalone have unique features: the shell is round, with two to three spirals. The last spiral is grown into a large "ear"-like shape, which explains the name 'ear-shell'. The inside of the shell is shiny, from silvery white to green-red mother-of-pearl.
Abalones can start to give birth at a small size. Their fertility is high and increases with size (from 10,000 to 11 million eggs at a time).
Young abalones, called larvae, feed on plankton. The adults eat plants and feed on algae. They like to eat red algae. Their size can be as small as 20mm to as big as 200mm.
Abalone shell
The shell of the abalone is known for being very strong. It is made of very tiny calcium carbonate tiles stacked like bricks. Between the layers of tiles is a sticky protein substance. Allergic skin reactions and asthma attacks can happen when breathing the dust made when these tiles are broken down.
The colorful inside part of the abalone shell can be used for decorative inlays, in guitars, for example.
Abalone trade
California
Sport harvesting of red abalone is allowed with a California fishing license and an abalone stamp card. Abalone may only be taken using breath-hold techniques: freediving or shore picking. SCUBA diving for abalone is strictly not allowed. Abalone harvesting is not allowed south of the mouth of the San Francisco Bay. There is a size minimum of seven inches measured across the shell and a limit of three per day and 24 per year that can be taken. Abalone may only be taken in April, May, June, August, September, October, and November, but they may not be taken in July, December, January, February, or March. Transportation of abalone is only legal while the abalone is still attached to the shell. The sale of sport-caught abalone is illegal, including the shell. Only red abalone may be taken; black, white, pink, and flat abalone are protected by law.
Abalone divers normally wear a thick wetsuit, including a hood, booties, and gloves. They also wear a mask, snorkel, weight belt, abalone iron, and abalone gauge. It is common to take abalone in the water a few inches up to 10 m/28' deep. Fewer freedivers can work deeper than that. Abalone is usually found on rocks near food sources (kelp). An abalone iron is used to pry the abalone from the stone before it can fully clamp down. Visibility usually is five to ten feet. Divers commonly dive out of boats, kayaks, tube floats, or directly off the shore. An eight-inch abalone is considered a good catch, a nine-inch would be very good, and a ten-inch plus (250mm) abalone would be an excellent catch. Rock- or shore-picking is different from diving, where the rock picker feels below rocks during low tides for abalone.
There has been a trade-in diving to catch abalones off parts of the United States coast before 1939. In World War II, many of these abalone divers were recruited into the United States armed forces and trained as divers who can perform military combat and operations underwater. There are also known as frogman.
Black market
There is a worldwide black market in abalone meat collection and export. In New Zealand, where abalone is called paua in the Maori language, this can be a particular problem. The right to harvest paua can be granted legally under Maori customary rights. When such permits are overused, it is difficult to police. The legal daily limit is ten paua per diver with a minimum shell length of 125 mm. Many Ministry of Fisheries officers strictly enforce the limit with the help of the police. Paua' poaching' is a major industry in New Zealand, with many thousands of abalones being stolen, mostly undersized. Convictions have caused the removal of diving gear, boats, and motor vehicles, fines, and, in rare cases, imprisonment. The Ministry of Fisheries expects in the year 2004/05, nearly 1000 tons of paua will be poached, with 75% of that being undersized.
Highly polished New Zealand paua shells are extremely popular as gifts with their striking blue, green and purple iridescence. Transporting unprocessed abalone shells out of New Zealand is illegal.
South Africa
The largest abalone in South Africa, "Haliotis midae," can be found along about two-thirds of the country's coastline. Abalone-diving has been a recreational activity for many years, but stocks are currently being threatened by illegal commercial harvesting.
Channel Islands, Europe
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 to keep stocks. The taking of ormers is now restricted to many 'ormering tides,' from January 1 to April 30, which happen on the full or new moon two days after. No ormers may be taken from the beach 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.
White Abalone is going extinct because of its delicious tender meat, jewelry, and beautiful shell.
Farming
There have been a number of attempts to artificially grow (farm) abalone for the purpose of consumption.