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 [分享]谁吃过鲍鱼？？？ |
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Seagod
现已禁止
头衔: 海归少将
声望: 学员
性别: 
加入时间: 2005/03/08
文章: 2014
来自: 屁 股 街 屁 股 村
海归分: 316222
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作者：Seagod 在 海归茶馆 发贴, 来自【海归网】 http://www.haiguinet.com
RED ABALONE AND ITS NATURAL HISTORY
The red abalone is a gastropod (univalve) having a large, oval shell shaped like a shallow bowl. It is the largest of California's marine snails and one of several abalone species inhabiting the California coast. The shells of some archaeological specimens are close to 30 cm in length, and lengths around 20 cm are common. Most of the abalone's body under its shell consists of a "foot" for attaching itself to a rock surface and sometimes for locomotion, although a mature abalone generally resides in one spot. Abalone feed on algae, and the red or coral color of the outer surface of a red abalone shell (the shell's epidermis) results from consumption of red algae
The interior surface of the abalone shell (to which its soft tissue is attached) is mother-of-pearl, or nacre. Its relative smoothness and high luster have made it an attractive material for making ornaments in both prehistoric and historic times.
Water taken in by the abalone and passed over its gills exits through a row of holes (apertures) along one side of the shell (although the hole nearest the front (anterior) edge of the shell may be used for water intake). As the shell grows larger, new and larger holes are added and the old holes on the opposite (exterior) end of the row are plugged with nacre. Typically, four such holes are open, but the holes filled with nacre are easily seen on the shell.
Today, most red abalone live mainly in subtidal waters to depths of more than 20 meters, even along the central California coast, where historically they also occupied the intertidal zone in significant numbers. Their geographic distribution extends from Sunset Bay along the Oregon coast southward to Bahía de Tortuga in Baja California. The largest concentrations, however, are in central California.
Shorepicking by visitors to the coast keeps the numbers of red abalone in intertidal waters low, and because of intensive harvesting by commercial abalone divers over the last 30 years, their numbers in subtidal waters anywhere along the California coast are much lower than they were earlier. Sea otters living along the Monterey County coast also are a significant predator; they use rocks to smash the shell of an abalone, thus exposing its soft tissue. If an abalone is able to avoid its predators, it may live to be more than 20 years old.
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作者：Seagod 在 海归茶馆 发贴, 来自【海归网】 http://www.haiguinet.com
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 [分享]谁吃过鲍鱼？？？ -- Seagod - (2425 Byte) 2006-3-15 周三, 00:26 (939 reads)
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