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Standard Weights ( W s ) for Striped Bass, White Bass, and Hybrid Striped Bass
Author(s) -
Brown Michael L.,
Murphy Brian R.
Publication year - 1991
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1991)011<0451:swwsfs>2.3.co;2
Subject(s) - bass (fish) , morone , percentile , morone saxatilis , confidence interval , population , mathematics , fishery , biology , zoology , statistics , demography , sociology
We developed relationships between standard weight ( W s , g) and total length (TL, mm) for striped bass Morone saxatilis , white bass M. chrysops , and palmetto bass M. saxatilis ♀ × M. chrysops ♂ by use of the regression‐line–percentile (RLP) technique. The proposed 75th‐percentile‐based W s equations are: log 10 W s = −4.924 + 3.007 log 10 TL for striped bass; log 10 W s = −5.066 + 3.081 log 10 TL for white bass; and log 10 W s = −5.201 + 3.139 log 10 TL for hybrid striped bass. These formulae produced distributions for individual and population‐mean relative‐weight ( W r ) values similar to those observed for other species in earlier studies ( W r = 100· W / W s ). The previously defined target range for W r encompassed reasonable proportions of striped bass, white bass, and hybrid striped bass in the present study. The 75th‐percentile weights for centimeter classes provided log 10 weight‐log 10 length relationships that may be characterized as better than average. There were no appreciable length‐related trends observed for the proposed standards. We predicted confidence intervals for mean W r of populations and specific length categories from individual populations in order to calculate the number of individuals needed to give a confidence interval of selected width. We observed no relationships between W r and population‐structure indices.