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Growth, mortality, reproduction and feeding of knobbed porgy, Calamus nodosus, along the southeastern United States coast
Horvath, M.L.; Grimes, C.B.; Huntsman, G.R. (1990). Growth, mortality, reproduction and feeding of knobbed porgy, Calamus nodosus, along the southeastern United States coast. Bull. Mar. Sci. 46(3): 677-687
In: Bulletin of Marine Science. University of Miami Press: Coral Gables. ISSN 0007-4977, more
Peer reviewed article  

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Keywords
    Age composition; Diets; Feeding; Fishery biology; Food organisms; Growth; Mortality; Recruitment; Sex ratio; Sex reversal; Sexual reproduction; Sport fishing; Calamus nodosus Randall & Caldwell, 1966 [WoRMS]; Sparidae Rafinesque, 1818 [WoRMS]; Marine

Authors  Top 
  • Horvath, M.L.
  • Grimes, C.B.
  • Huntsman, G.R.

Abstract
    The authors studied age, growth, mortality, age/size composition, reproduction and feeding of knobbed porgy caught off North Carolina and South Carolina from 1972 to 1978. Maximum age determined from scales was 17 yr for a 460 mm TL specimen. Annual increments in back-calculated length were 194 mm the first year, 57 mm the second year, and 42, 34 and 25 mm for years 3-5. Annual growth for ages 6-10 and 11-16 yr averaged 13 and 12 mm. The von Bertalanffy growth model fitted to these data is given. Sex ratio at size and age data indicated that knobbed porgy are protogynous hermaphrodites, changing sex when they are 300-500 mm TL. Females were significantly predominant in the sample population (59%). Monthly mean gonosomatic indices suggest that fish spawn in May and June. Limited diet data showed that knobbed porgy are benthic carnivores preying primarily on mollusks, crabs, polychaetes and sea urchins, which they crush with their strong jaw and pharyngeal teeth.

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