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Ch. 11: Pearl Fisheries

Ch. 11: Pearl Fisheries Page of 358 Ch. 11: Pearl Fisheries Text size:minus plus Restore normal size   Mail page  Print this page
THE PEARL
in the present regardless of the future, but these are gradually being made amenable to restric­tive laws as authorities awake to the value of the industry. A greater danger which threatens the unio of American streams, is the pollution of the water by the discharge of the refuse of factories and the sewage of cities into them. A mussel bed will recover in time when denuded by fishers, but sewage and poison kills it out entirely.
Although fresh-water pearl-bearing mussels are found in the streams of many countries, only in the United States are they taken in sufficient quantities to make the fishings important as an industry. They are to be found throughout the Mississippi drainage area and in part of that of the St. Lawrence. Few exist on the Pacific coast and those of the Atlantic coast are generally inferior as pearl mussels. There are many varieties of the unio which yield pearls. Latin names are given by different writers to distinguish them, but as scientists differ in their classifications, the names are not always uniform and are not sufficiently well established to be useful, descriptively, to the
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Ch. 11: Pearl Fisheries Page of 358 Ch. 11: Pearl Fisheries
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