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Because it is not possible to identify species with echosounders alone, trawling is widely used as a method for collecting species and size composition data for allocating acoustic fish density estimates to species or size groups. In the Laurentian Great Lakes, data from midwater trawls are commonly used for such allocations. However, there are no rules for how much midwater trawling effort is required...
We compare acoustic measures of target strength (TS) (at 70kHz) and fish abundance with fish size and abundance obtained from high-speed Miller larval fish samplers in Oneida Lake, New York, collected in June and July, 1995-1999. High-speed Miller samplers showed two peaks in size distributions on all dates, 3-15 and 15-30mm. Corresponding acoustic TS distributions also showed two peaks, one between...
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