. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 1216 Benthic biology upper slope (Fig. 68-1). These surveys were designed to determine what demersal fish and shellfish com- munities of the eastern Bering Sea could be affected by development of continental shelf energy resources. Data on fish and epibenthic invertebrates were gathered from several hundred locations with a modified 400-mesh Eastern otter trawl. The data resulting from these surveys offer significant insight into the population and biological cha
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 1216 Benthic biology upper slope (Fig. 68-1). These surveys were designed to determine what demersal fish and shellfish com- munities of the eastern Bering Sea could be affected by development of continental shelf energy resources. Data on fish and epibenthic invertebrates were gathered from several hundred locations with a modified 400-mesh Eastern otter trawl. The data resulting from these surveys offer significant insight into the population and biological characteristics of numerous species of snails. This chapter brings together information on distribution, species associa- tion, biology, and the fishery for eastern Bering Sea snails based primarily on data collected on NMFS trawl surveys. SNAIL RESOURCE Seventy-two species of gastropods in 19 families were identified in trawl surveys conducted in 1975 and 1976 (Feder et al. 1978; Pereyra et al. 1976; unpublished data. Table 68-1). While most small species were usually found inside shells or other objects, snails larger than about 60 mm in total length were regularly retained by the trawl mesh. The small codend mesh size (32 mm) and the bottom- tending properties of the net allowed a reasonable assessment of epibenthic snails larger than about 60 mm. How many of these larger snaUs avoid capture. 170° 175° 180° 175° 170° 166° 160° 155°. 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 Hood, D. W. (Donald Wilbur), 1918-; Calder, John A; United States. Office of Marine Pollution Assessment; United States. Bureau of Land Management. [Rockville, Md. ?] : U. S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Office of Marine Pollution Assessment ; Seattle, Wash. : Distributed by the Un
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