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Benthic Invertebrates in Lake Ashtabula Reservior, North Dakota

The kinds and amounts of benthic invertebrates in Lake Ashtabula, a 20-year-old eutrophic reservoir in southeastern North Dakota, were recorded at a single station located 3.2 km N of the dam. The average standing crops of benthic invertebrates in the sampling station collected during April, June and August 1967 were 6.4, 8.2 and 7.1 g m-2, respectively, and 1831, 2622 and 1295 individuals m-2. Organisms in the 0-3 m depth zone accounted for 28% by number and 53% by weight of all organisms present in the study area from April to August; 56% by number and 37% by weight were in the 3-8 m depth zone; and 16% by number and 9% by weight were in the 8-12 m depth zone. The quantity and kinds of its benthic invertebrates indicate Lake Ashtabula is eutrophic when compared with data available from other lakes that are also unstratified during open-water periods.