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Selection of Body Site for Scale Samples in the White Perch, Roccus americanus

Romeo J. Mansueti
Chesapeake Science
Vol. 1, No. 2 (Jun., 1960), pp. 103-109
Stable URL: http://www.jstor.org/stable/1350926
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Selection of Body Site for Scale Samples in the White Perch, Roccus americanus
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Abstract

Scales from 13 different areas of the body of white perch, Roccus americanus, were studied to ascertain the extent of variability in the calculated standard length at the formation of the first annulus. The objective was to determine the area from which scales most representative of all the areas could be sampled for age and growth studies. Calculated lengths from each area in 10 specimens ranging from 75 to 143 mm standard length from age groups I to III were compared with the average for all areas, and the one with the least deviation from the mean was considered suitable for age, growth and tagging studies. Minimum average differences were obtained from scales taken from the side of the body under the posterior two-thirds of the dorsal fins, both above and below the lateral line. Area 9 above the lateral line and between the spinous and soft dorsal fin was selected as the sample site in a study of the white perch population of the Patuxent River, Maryland.

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