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Age, growth and reproductive biology of the silky shark, Carcharhinus falciformis, and the scalloped hammerhead, Sphyrna lewini, from the northwestern Gulf of Mexico

Environmental Biology of Fishes volume 19, pages 161–173 (1987)Cite this article

Synopsis

The silky shark, Carcharhinus falciformis, and scalloped hammerhead, Sphyrna lewini, represent >80% of the shark by-catch of the winter swordfish/tuna longline fishery of the northwestern Gulf of Mexico. This catch represents a potential supplemental fishery, yet little is known of the life histories of the two species. This report relates reproductive biology data to age and growth estimates for 135 C. falciformis and 78 S. lewini. Unlike other regional populations, C. falciformis in the Gulf of Mexico may have a seasonal 12 month gestation period. Males mature at 210–220 cm TL (6–7 yr); females at >225 cm TL (7–9 yr). Application of age at length data for combined sexes produced von Bertalanffy growth model parameter estimates of L∞ = 291 cm TL, K = 0.153, t0 = −2.2 yr. Adult male S. lewini outnumbered adult females in catches because of differences in the distributions of the sexually segregated population. Males mature at 180 cm TL (10 yr); females at 250 cm TL (15 yr). von Bertalanffy parameter estimates for combined sexes of this species were L∞ = 329 cm TL, K = 0.073, to = −2.2 yr.

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  1. Department of Wildlife and Fisheries Sciences, Texas A& M University, College Station, TX, 77843, U.S.A.

    Steven Branstetter

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Branstetter, S. Age, growth and reproductive biology of the silky shark, Carcharhinus falciformis, and the scalloped hammerhead, Sphyrna lewini, from the northwestern Gulf of Mexico. Environ Biol Fish 19, 161–173 (1987). https://doi.org/10.1007/BF00005346

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  • DOI: https://doi.org/10.1007/BF00005346

Keywords

  • Chondrichthyes
  • Elasmobranchs
  • Fisheries
  • Ageing methods
  • Growth rates
  • Gestation periods
  • Maturity
  • Vertebral bands
  • Weight-length relationships
  • Life histories