. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 94 BULLETIN OF THE BUREAU OP FISHERIES deposit from 20,000 to upwards of 40,000 eggs, averaging about 30,000. In sexually mature herrings, just before spawning commences, the genital organs are so large as to make up about one-fifth the total weight of the fish. The period of incubation is governed by temperature—European students tell us that it requires as long as 40 days at ° F., 15 days at 44° to 46° F., and 11 days at 50° to 51° F., while experiments on the Massachusetts coast b
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 94 BULLETIN OF THE BUREAU OP FISHERIES deposit from 20,000 to upwards of 40,000 eggs, averaging about 30,000. In sexually mature herrings, just before spawning commences, the genital organs are so large as to make up about one-fifth the total weight of the fish. The period of incubation is governed by temperature—European students tell us that it requires as long as 40 days at ° F., 15 days at 44° to 46° F., and 11 days at 50° to 51° F., while experiments on the Massachusetts coast by the U. S. Bureau of Fisheries gave 10 to 12 days in the temperature prevailing there in autumn. Ten to fifteen days might be stated as an average for the Gulf of Fig. 41.—Eggs of the herring (Clwpea harengus) attached to seaweed. After Ehrenbaum Spawning grounds in the Gulf of Maine.—Herring spawn all along the shores of the Gulf of Maine wherever the bottom is suitable, from Grand Manan on the east to Cape Cod on the west, as well as along the western shores of Nova Scotia, as, for instance, about the Trinity Ledges (an important breeding ground), though whether as universally there we have not been able to learn. Probably the most productive spawning ground within the limits of the Gulf is at the mouth of the Bay of Fundy, particularly about Grand Manan. At present, according to Hunts- man, herring spawn only locally, e. g., at Minas Basin, in the inner part of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States Fish Commission. Washington, The Commission, Govt. Print. Off
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