. Commercial fisheries review. Fisheries; Fish trade. SIZES OF MUSSELS Table 3 reveals some interesting characteristics of the size distribution of the mussels on the beds. An examination of the table shows that there are many localities in vrtiich there is no well defined and distinct mode indicative of the young from the summer's set. Only Pleasant River, Narraguagus River, Winter Harbor, and Dux- bury Bay have such modes. The absence of distinct year-size groups is even more apparent in the areas below low tide at Ingall's Island, Jim's Island, Moon Ledge, Skillings River, Sheep Island, Mac
. Commercial fisheries review. Fisheries; Fish trade. SIZES OF MUSSELS Table 3 reveals some interesting characteristics of the size distribution of the mussels on the beds. An examination of the table shows that there are many localities in vrtiich there is no well defined and distinct mode indicative of the young from the summer's set. Only Pleasant River, Narraguagus River, Winter Harbor, and Dux- bury Bay have such modes. The absence of distinct year-size groups is even more apparent in the areas below low tide at Ingall's Island, Jim's Island, Moon Ledge, Skillings River, Sheep Island, Mackerel Cove, Maddaket Harbor, and off Brew- ster, In these eight local- ities, between and 100 percent of the mussels were over two inches in length. There is little information available concerning the growth of mussels under natural con- ditions in the North Atlantic region, Mossop (1921, 1922) states that mussels grew mm (.43 inches) per year at St, Andrews, New Brunswick, in the intertidal zone, while on a submerged reef the growth was 14,8 mm (.58 inches). At Sorrento, Maine, in October 1946 the mussel spat averaged ,13 inches in length and ranged from .01 to .34 inches. It does not seem possible that lack of small mussels in many of the localities during September, October, and November, can be attributed to rapid growth of the year's spat to the thiree-or four-inch size. It would seem more likely that the survival of the spat is variable from year to year, Lambert (1935) reported that *Fishery Biologist, ) Branch of Fishery Biology, U. S. Fish and Wildlife Service. ** Formerly Biological Aid, ) j (w. Note: Part I (The Survey to Discover the Locations and Areas of the North Atlantic Massel Producing Beds) of this series appeared in the September 1949 issue of Commercial Fisheries Heview, pp. 1-10. SOME OF THE MUSSEL'S ENEMIES: A SEA MUSSEL WHICH HAS BEEN PERFORATED BY ONE OF THE WINKLES. THE OYSTER DRILL (UROSALPINX CJNEREA) . THE DOG WHELK (PURPURA LAP IlLUS). T
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