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标题新东方34-1 分类12 查看3234 上传80

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Raising Oysters

In the past oysters were raised in much the same way as dirt farmers raised tomatoes - by transplanting them.

First, farmers selected the oyster bed, cleared the bottom of old shells and other debris, then scattered clean shells about. Next, they "planted" fertilized oyster eggs, which
within two or three weeks hatched into larvae. The larvae drifted until they attached themselves to the clean shells on the bottom. There they remained and in time grew into baby oysters called seed or spat. The spat grew larger by drawing in seawater from which they derived microscopic particles of food. Before long, farmers gathered the baby oysters, transplanted them in other waters to speed up their growth, then transplanted them once more into another body of water to fatten them up. Until recently the supply of wild oysters and those crudely farmed were more than enough to satisfy people's needs.But today the delectable seafood is no longer available in abundance. The problem has become so serious that someoyster beds have vanished entirely.

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