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Age, Growth, Natural Mortality, and Reproductive Seasonality of Knobbed Porgy from Southeastern United States Waters
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2019
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Source: Marine and Coastal Fisheries, 11(2), 231-245
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Journal Title:Marine and Coastal Fisheries
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Description:The Knobbed Porgy Calamus nodosus, an important secondary species in reef fish catches of the southeastern United States, was recently the subject of a fishery closure due to the porgy complex quota being exceeded. Knobbed Porgy (n = 448) were aged using sectioned sagittal otoliths. Opaque zones on otolith sections were annular, forming in March–July (peaking in May). Knobbed Porgy ranged from 1 to 21 years, and the largest fish measured 507 mm TL. Body size relationships relating TL, FL, and total body weight (W) for Knobbed Porgy were TL = 1.07·FL + 22.93 (n = 3,173; r2 = 0.97), FL = 0.91·TL − 12.54 (n = 3,173; r2 = 0.97), W = (1.38 × 10−5)TL3.03 (n = 12,732; r2 = 0.92), and W = (7.99 × 10−5)FL2.79 (n = 3,199; r2 = 0.90). Mean length at age was significantly different between Knobbed Porgy collected in North Carolina through southeast Florida (northern region) and those collected in the Florida Keys (southern region). The von Bertalanffy growth equations for Knobbed Porgy were Lt = 412[1 − e−0.20(t + 1.97)] (n = 448) for all regions combined, Lt = 403[1 − e−0.38(t + 0.0001)] (n = 117) for northern region fish, and Lt = 326[1 − e−0.42(t + 1.61)] (n = 331) for southern region fish. Age-varying estimates of natural mortality were 0.36–0.79 year−1 (ages 2–21) for the northern region and 0.42–0.67 year−1 (ages 1–12) for fish from the Florida Keys. Hydrated oocytes were present during February–April in macroscopically staged ovaries (n = 148) for fish from the Florida Keys, and gonadosomatic index data indicated that the month of peak spawning in females was April. The updated life history information should be useful to fishery managers in formulating effective management strategies.
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Source:Marine and Coastal Fisheries, 11(2), 231-245
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ISSN:1942-5120;1942-5120;
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Rights Information:CC BY
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Compliance:Submitted
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