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Age, Growth and Distribution of the Black Drum (Pogonias cromis) in Virginia
Author(s) -
Richards C. E.
Publication year - 1973
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1973)102<584:agadot>2.0.co;2
Subject(s) - drum , distribution (mathematics) , geography , biology , demography , archaeology , mathematics , sociology , mathematical analysis
Black drum were sampled from pound nets, haul seines, sport catches, and exploratory trawl and seine gear from 1959 through 1970 in a study of growth and distribution. Juveniles as small as 22 mm and adults up to 132 cm length and 46 kg (101.25 lbs) were examined. No sex differential in growth occurred and mean lengths for age‐groups I, II and III were 223 mm, 406 mm and 562 mm respectively. Weights for the same age sequence are 0.17, 1.09 and 2.93 kg. More than one scale ring is apparently formed each year after the fourth year. Growth equations are: L t in cm: 147.4 (1 ‐ e −0.158(t + 0.04) ), and W t in kg = 52.9 (1 ‐ e −0.160t)3 . During the years 1962–1970, 69.6% of commercial landings by weight and 97.6% of citation sport catches by number occurred in the period April‐June. Ocean surface temperatures at Chesapeake Light averaged 17.54 C with a standard deviation of 2.69 degrees coincidentally on days of sport catches April through June.