A summary of abundance, catch per unit effort, and mean length estimates of burbot sampled in rivers of interior Alaska, 1986-1992

Description

This report compiles all catch per unit effort and mean length estimates obtained from sampling during 1986-1992 in 67 river sections located throughout the Tanana River drainage. Estimates were calculated for three length categories: partially recruited "small" burbot (300 to 449 millimeters total length), fully recruited "medium" burbot (450-799 millimeters total length), and partially recruited "large" burbot (^800 millimeters total length). In addition, seven estimates of abundance for burbot 450 millimeters total length from five different river sections are presented. The specific objectives of this report were to estimate mean length and mean CPUE in one 24 kilometer section of the Tanana River and in one 24 kilometer section of the Chena River sampled during August and September, 1992. Estimates of mean CPUE in the Tanana River section were 0.21 (number of burbot caught per 24 hour set of one hoop trap) (SE = 0.03) for small burbot, 0.96 (SE = 0.08) for medium burbot, and 0.06 (SE = 0.01) for large burbot. Estimates of mean CPUE in the Chena River section were 0.07 (SE = 0.02) for small burbot, 0.41 (SE = 0.05) for medium burbot and 0.004 (SE = 0.004) for large burbot. Estimates of mean length for burbot sampled in the Tanana River section were 398 (millimeters total length) (SE = 6) for small burbot, 557 (SE = 5) for medium burbot, and 864 (SE = 16) for large burbot. Estimates of mean length for burbot sampled from the Chena River section were 388 (millimeters total length) (SE = 10) for small burbot and 575 (SE = 7) for medium burbot.

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