Pearls

Cover Pearls
Pearls
William J William John Dakin
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On some of the paars this depletion seems to be of regular occurrence every year.
Next we come to the natural enemies of the mollusc, and they are numerous, though probably only a few commit serious damage. The " black- listed" animals are in the first place the fishes which devour oysters. They are chiefly skates and rays of different species, and the file-fishes. The large rays, up to a dozen or more feet across, have been observed feeding upon the shellfish. With their broad-surfaced, specia
...lly adapted crushing teeth they can make short work of the delicate shells ; and shell fragments, the result of their depredations, are often numerous. The file-fishes feed upon immature oysters.
The next group of enemies is that of the molluscs which bore into shells. The gastropoda (univalves like the common whelk of the English coast) are provided with a proboscis armed with a chitinous file. In addition, however, to boring holes by this means and then inserting the proboscis, it is quite certain that many of these univalves either catch an unsuspecting bivalve with its shell open, or drive part of their shell between the valves of their prey and iv] LIFE-HISTORY AND ENVIRONMENT 51 then attack the muscle.


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