Abstract
Abstract Dual-beam and echo integration data were collected with 38-, 120-, 200-, and 420-kHz hydroacoustic systems from a single boat in August 1991 to estimate pelagic fish distribution, density, and mean lengths at three study sites of Lake Texoma, Texas–Oklahoma. Areal and volumetric densities were estimated for randomly selected transects in each of the study areas. Density varied among frequencies and sites, and between day and night sample periods. Density estimates were highest in Big Mineral and lowest in the Central Pool site, Calculation of sample sizes required to obtain coefficients of variation of the mean equal to 20% indicated that fewer samples would be required for night sampling (range, 2–14) than day sampling (8–54) and that fewer samples would be required in Big Mineral (2–3) than in Central Pool (3–6) or Little Mineral (7–14) at night. Pelagic fish in Big Mineral were closer to the surface than in Little Mineral or Central Pool. Wavelength scattering characteristics of the four frequ...
Published Version
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