Abstract
Abstract We evaluated a large data set and confirmed that current standard weight (Ws ) equations for white crappies Pomoxis annularis and black crappies P. nigromaculatus are length-biased. We applied the regression-line-percentile (RLP) technique to length-weight data for 27,002 white crappies (175 populations) and 21,709 black crappies (80 populations) to develop new 75th-percentile Ws relationships. The proposed Ws equations are log10 Ws (g) = –5.642 + 3.332 log10TL(mm) for white crappies and log10 Ws (g) = –5.618+ 3.345 log10TL(mm) for black crappies; TL is total length. There was no systematic bias evident in Wr values (Wr = 100· W /Ws ; W is individual fish weight) calculated with the RLP-generated equations. Frequency distributions of population-mean Wr values were consistent with those from studies of other fish species. No regional trends in Wr were observed. Moderate correlations were found between Wr and population structure. Relative weight was generally highest in the spring, decreased after...
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