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Free Content The age and growth of southern flounder, Paralichthys lethostigma, from Louisiana estuarine and offshore waters

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Abstract:

Age and growth of southern flounder, Paralichthys lethostigma Jordan and Gilbert, 1884, were examined for fish sampled from Louisiana from 1987–1998. Marginal increment analysis of 1313 otolith sections verified annual opaque increment formation from January–May. Otoliths had left/right asymmetry in core position and weight. Maximum observed age for males was 4 yrs and 8 yrs for females. Total length (TL) frequency distributions were significantly different between sexes, ranging from 127–414 mm TL for males and 189–764 mm TL for females. Males had a modal TL of 280 mm, while females had a modal TL of 390 mm. No significant difference was found between inshore and offshore male TL distributions; however, females differed significantly with a higher percentage of smaller individuals offshore. Growth was significantly different between sexes and expressed with the von Bertalanffy growth equation as Lt = 332.5{1 – e [–1.03(t + 0.25)]} for males and Lt = 556.5{1 – e [–0.51(t + 0.62)]} for females. Growth parameters suggest rapid growth to age two for males and age three for females. Males exhibited a much smaller maximum theoretical size (L) than females.

Document Type: Research Article

Publication date: 2004-07-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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