Do differences in life history exist for blacktip sharks, Carcharhinus limbatus, from the United States South Atlantic Bight and Eastern Gulf of Mexico?

Carlson, John K.; Sulikowski, James R.; Baremore, Ivy E.

doi:10.1007/978-1-4020-5570-6_8

Cited by 13 publications

(37 citation statements)

References 19 publications

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“…Unfortunately, timely and regional reproductive information is rare for many elasmobranch species throughout the world. Even more rare are reproductive studies that also estimate the ages of elasmobranchs; most age-at-maturity estimates are back-calculated using the von Bertalanffy (von Bertalanffy 1938) equation for size at maturity (Casey et al 1985;Carlson et al 2006;Barreto et al 2011).…”

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confidence: 99%

“…In U.S. waters, it ranges from Massachusetts to Florida in the western North Atlantic Ocean and throughout the Gulf of Mexico (McEachran and Fechhelm 1998). Previous studies in the Gulf of Mexico have mostly focused on age and growth and used back-calculation methods to estimate age at maturity (Branstetter 1987;Killam and Parsons 1989;Carlson et al 2006). These studies have estimated size at maturity ranges for Gulf of Mexico Blacktip Sharks of 103-110 and 117-132 cm FL for males and females, respectively.…”

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confidence: 99%

“…Back-calculated ages at maturity in these studies were estimated to be 4-5 years for males and 5-8 years for females. Sizes and ages were also estimated by Carlson et al (2006) for Blacktip Sharks in the western North Atlantic Ocean: median maturity estimates were 117 cm FL (5.0 years) for males and 126 cm FL (6.7 years) for females. While Carlson et al (2006) provided maturity information, the Blacktip Sharks in that study were only classified as mature or juvenile based on internal examination and no further reproductive information was collected.…”

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confidence: 99%

“…Sizes and ages were also estimated by Carlson et al (2006) for Blacktip Sharks in the western North Atlantic Ocean: median maturity estimates were 117 cm FL (5.0 years) for males and 126 cm FL (6.7 years) for females. While Carlson et al (2006) provided maturity information, the Blacktip Sharks in that study were only classified as mature or juvenile based on internal examination and no further reproductive information was collected. The most comprehensive reproductive study for Blacktip Sharks in the eastern United States was in the 127 western North Atlantic Ocean (Castro 1996).…”

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confidence: 99%

“…For this reason, the Blacktip Shark is managed as two stocks: the Gulf of Mexico and Atlantic Ocean stocks. The objectives of this study were to provide the first detailed reproductive analysis for the Blacktip Shark in the Gulf of Mexico for stock assessment and to test for differences in size and age at maturity between the current study and Carlson et al (2006).…”

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confidence: 99%

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Reproduction of the Blacktip Shark in the Gulf of Mexico

Baremore

Passerotti

2013

Mar Coast Fish

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Reproductive and age data were collected for Blacktip Sharks Carcharhinus limbatus in the Gulf of Mexico from fishery‐dependent and ‐independent sources from 2006 to 2011 for stock assessment. A total of 757 Blacktip Sharks were sampled for reproductive analysis (399 females, 358 males), of which 741 were aged. Additional length and age data from a previous age and growth study on Blacktip Sharks in the Gulf of Mexico (207 females, 161 males) were incorporated into the size‐ and age‐at‐maturity analyses. The results indicated that Blacktip Sharks in the Gulf of Mexico have a synchronous, seasonal reproductive cycle and that females exhibit a biennial ovarian cycle. Male and female mating and parturition peaked from March to May. Length at 50% maturity was estimated to be 105.8 and 119.2 cm FL for males and females, respectively, while age at 50% maturity was calculated as 4.8 and 6.3 years. Near‐term pups averaged 38 cm FL, and gestation was approximately 12 months. Litter size was 4.5 pups per female, and fecundity was found to increase with both maternal size and age. Maternal body size—but not age—had a positive influence on offspring fitness. This represents the first comprehensive reproductive study of Blacktip Sharks in the Gulf of Mexico. Received October 1, 2012; accepted December 5, 2012

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confidence: 99%

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confidence: 99%

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Reproduction of the Blacktip Shark in the Gulf of Mexico

Baremore

Passerotti

2013

Mar Coast Fish

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Vertebral chemistry distinguishes regional populations of Blacktip Sharks in the northern Gulf of Mexico

Hayne,

Richards,

Drymon

et al. 2024

Mar Coast Fish

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ObjectiveUnderstanding the spatial connectivity of elasmobranch populations is critical for regional fisheries management. The Blacktip Shark Carcharhinus limbatus is abundant in coastal waters of the Gulf of Mexico (GoM) and important in recreational and commercial fisheries. Based on genetic and tagging studies, GoM Blacktip Sharks are currently managed under separate quotas between the eastern and western GoM (divided at 88°W), but no studies have used vertebral chemistry to assess the population structure of adult Blacktip Sharks.MethodsWe compared vertebral elemental signatures (barium [Ba], magnesium [Mg], manganese [Mn], strontium [Sr], and zinc [Zn]) for the first year of life with last occupied habitats (vertebral edges) in Blacktip Sharks collected from the western (Texas and Louisiana) and eastern (Alabama and Florida) coastal waters of the northern GoM.ResultWe found significant regional differences in Ba, Mg, Mn, and Sr vertebral edge signatures, suggesting ecological separation of Blacktip Sharks. Significant correlation between first‐year and edge signatures suggested a high degree of residency between life stages. Cross‐validated discriminant function analyses yielded highest regional classification accuracies when Florida sharks were grouped separately west of 88°W (90%), demonstrating the unique elemental signatures of eastern versus western GoM Blacktip Sharks under current management delineations.ConclusionCombined, these findings demonstrate that trace element markers can distinguish regional populations of Blacktip Sharks and provide a complimentary approach in addition to genetics and physical tagging to support current stock management efforts.

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