A General Guide for Deriving Abundance Estimates from Hydroacoustic Data





Tables in order of occurrence

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Table 1. Definitions, symbols, and units.

Table 2. Calculation of λ for common fisheries acoustic frequencies in freshwater (c=1450 m•s-1)

Table 3.  Comparison between wide and narrow beam attributes.

Table 4.  An example time budget showing possible categories and calculations.

Table 5.  Transducer calibration standard values at different sound speed.  ‘Cu’ denotes copper and ‘WC’ denotes tungsten carbide.  Calculations for the WC spheres are from Foote (1990) (38.1 mm, bandwidth about 3 kHz) or from the manufacturer’s data sheet (Biosonics and Simrad).

Table 6.  Modification status for system and collection settings.

Table 7.  Summary of Great Lakes trawls.

Table 8. Calibration and environmental settings needed in Echoview for different echosounders used in the Great Lakes. Sv is the Sv variable, TSu – TSu variable, Ang – Angular position variable, SED – Single echo detection variable, Trans – Transducer variable.

Table 9. Average and 90 percentiles for backscattering cross sections transformed to TS from Onondaga Lake, New York, May 2005, collected with 70 kHz, 0.2 ms pulse duration, 11.40º beam width EY500 Simrad split beam unit. All TS larger than -70 dB are included (see Fig. 32). Analysis was done in Echoview with the criteria suggested above except as specified in the table.

Table 10. Typical horizontal and vertical bins for Great Lakes surveys.

Table 11.  Empirical target-strength relationships for Great Lakes species.  L is length in cm and w is weight in g.  This table should be updated to include studies from other areas of the same species groups, including European smelt and coregonids.