Tuesday, November 20, 2012

Abalone Song

Oh, some folks boast of quail on toast
Because they think it's toney,
But I'm content to owe my rent
And live on abalone.
Oh! Mission Point's a friendly joint,
Where ev'ry crab's a crony,
And true and kind you'll ever find
The clinging abalone.


He wanders free beside the sea,
Where'er the coast is stony;
He flaps his wings and madly sings—
The plaintive abalone.
By Carmel Bay, the people say,
We feed on lazzaroni
On Boston beans and fresh sardines,
A toothesome abalone.


Some live on hope, and some on dope
And some on alimony;
But my tom-cat, he lives on fat
And tender abalone.
Oh! some drink rain and some champagne,
Or brandy by the pony;
But I will try a little rye
With a dash of abalone.


Oh! some like jam, and some like ham,
And some like macaroni;
But bring me a pail of gin
A tub of abalone.
He hides in caves beneath the waves,—
His ancient patrimony;
And so 'tis shown that faith alone
Reveals the abalone.


The more we take the more they make
In deep-sea matrimony;
Race suicide cannot betide
The fertile abalone.
I telegraph my better half
By Morse or by Marconi;
But if the need arise for speed,
I send an abalone.


Thanks goes to David Schlottmann for sharing this Jack London poem with us.
Source: Weiderman, Richard. The Jack London Collector (July 1970)

Monday, November 19, 2012

Structure and properties of the Abalone shell

The shell of the abalone is exceptionally strong and is made of microscopic calcium carbonate tiles stacked like bricks. Between the layers of tiles is a clingy protein substance. When the abalone shell is struck, the tiles slide instead of shattering and the protein stretches to absorb the energy of the blow. Material scientists around the world are studying the tiled structure for insight into stronger ceramic products such as body armor.

Abalone - Threat of Extinction

Photo courtesy of Glen Bickford and Jane Bailey
Abalones have been identified as one of the many classes of organism threatened with extinction due to acidification of oceans from anthropogenic carbon dioxide, as reduced pH erodes their shells. It is predicted that abalones will become extinct in the wild within 200 years at current rates of carbon dioxide production.
In 1997 southern California was closed to the taking of abalone by both sport and commercial divers. This ban was introduced by the California State Department of Fish and Game as it became apparent that the numbers of abalone in southern California were so small it was feared that some species would become extinct. Abalone can still be taken north of San Francisco but only by skin diving (no air tanks) and a special abalone stamp must be purchased in addition to the regular sport license. This allows funding of a program to monitor the status of the stocks. Abalone diving remains a popular sport and as the human population grows in Northern California these remaining dense beds of abalone above San Francisco are threatened by poaching as well as sanctioned take. Northern California was never open to commercial abalone fishing and while El NiƱos and disease have not impacted the population, there are areas of easy access that have experienced serial depletion.
As abalone numbers decreased their price increased. This price increase began in the 1970s so that by the time the numbers of abalone were plummeting the price had reached a good $30 a pound. California had been one of the centers for commercial abalone harvesting and demand for the abalone was still high due to popular culture along the coast.
Genevieve (Genny) Anderson Author of online Marine Science Santa Barbara City College

Abalone - What is it?

The shells of abalones have a low and open spiral structure, and are characterized by several open respiratory pores in a row near the shell's outer edge. The thick inner layer of the shell is composed of nacre or mother-of-pearl, which in many species is highly iridescent, giving rise to a range of strong and changeable colors, which make the shells attractive to humans as decorative objects, and as a source of colorful mother-of-pearl.
The shell of abalone are convex, rounded to oval shape, and may be highly arched or very flattened. The shell is generally ear shaped, presenting two to three whorls. The last whorl (known as the body whorl) is auriform, meaning that the shell resembles an ear, giving rise to the common name "ear shell". The abalone shell has a series of holes near the anterior margin, that are respiratory apertures for the venting of water from the gills and for releasing sperm and eggs into the water column at the appropriate time. These holes collectively make up what is known as the selenizone which form as the shell grows. The older holes are gradually sealed up as the shell grows and new holes form. Each abalone species has a typical number of holes in the selenizone which remain open. There are four to ten of these holes, depending on the species.
The meat (foot muscle) of abalone is used for food, and the shells of abalone are used as decorative items and as a source of mother of pearl for jewelry and other decorative items. Its pearls have also been collected for centuries. The color of the shell is very variable from species to species, and may reflect the animal's diet. The iridescent nacre that lines the inside of the shell varies in color from silvery white, to pink, red and green-red, through to Haliotis iris, which shows predominantly deep blues, greens and purples.
The iridescent inside surface of a red abalone shell from Northern California. The coin is about one inch in diameter.

Farming of Abalone

Farming of abalone began in the late 1950s and early 1960s in Japan and China. Since the mid-1990s, there have been many increasingly successful endeavors to commercially farm abalone for the purpose of consumption. Over-fishing and poaching have reduced wild populations to such an extent that farmed abalone now supplies most of the abalone meat consumed. The principal abalone farming regions are China, Taiwan, Japan, and Korea. Abalone is also farmed in Australia, Hawaii, Canada, Chile, France, Iceland, Ireland, Mexico, Namibia, New Zealand, South Africa, Thailand, and the United States.