Shell-fish industries . t and their properdistribution, and the labor required ordinarily would notbe great. After attaining a length of more than two inches, thesoft clam is soon injured by exposure in summer. Tem-perature, however, and not merely exposure, is the im-portant factor. For several days the animal is able towithstand temperatures near the freezing point appar-ently without injury, but it lives only a short time out ofthe water in warm weather. Experiments show that anexposure of forty-eight hours during the hottest part ofthe summer will lead to the death of the majority, even if
Shell-fish industries . t and their properdistribution, and the labor required ordinarily would notbe great. After attaining a length of more than two inches, thesoft clam is soon injured by exposure in summer. Tem-perature, however, and not merely exposure, is the im-portant factor. For several days the animal is able towithstand temperatures near the freezing point appar-ently without injury, but it lives only a short time out ofthe water in warm weather. Experiments show that anexposure of forty-eight hours during the hottest part ofthe summer will lead to the death of the majority, even ifthey are then planted, but few perished on being exposedtwenty-four hours under the same conditions. Clams to be planted, however, should ordinarily bemuch smaller than this, and the power to resist heat in-creases as size diminishes. When kept in aquaria sup-plied with running water, large clams live only a fewdays when the weather is warm; but those less than halfan inch long have been kept alive in a hot room, barely. Fig. 62. Box suspended from a raft near a clam flat fromMay 15 until October 15 of the same year. The long-neckclams shown below had all settled from the swimming con-dition into the sand that it contained during this period.
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1910
