Age and Growth Estimates for Blacktip, Carcharhinus limbatus, and Spinner, C. brevipinna, Sharks from the Northwestern Gulf of Mexico

Branstetter, Steven

doi:10.2307/1445560

Cited by 97 publications

(87 citation statements)

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“…These data suggest that female blacktip sharks are using the coastal waters of Alabama for parturition, which has also been suggested by Parsons and Hoffmayer (2007). Previous studies examining blacktip sharks in the Gulf of Mexico reported fewer males than females in sample collections (Branstetter 1987;Killam and Parsons 1989;Carlson et al 2006), suggesting that the lower ratio of males collected in this study is not anomalous.…”

Section: Temporally Restricted Comparisons: 2006-2008supporting

confidence: 40%

Distributions of Sharks across a Continental Shelf in the Northern Gulf of Mexico

et al. 2010

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Declines in shark populations have sparked researchers and fishery managers to investigate more prudent approaches to the conservation of these fish. As managers strive to improve data collection for stock assessment, fisheries‐independent surveys have expanded to include data‐deficient areas such as coastal regions. To that end, a catch series from a nearshore survey off Alabama was combined with data from a concurrent offshore survey with identical methodology to examine the depth use of sharks across the continental shelf (2–366 m). The combined data set contained 22 species of sharks collected from 1995 to 2008: 21 species in the offshore data set (1995–2008) and 12 species in the nearshore data set (2006–2008). Depth was a significant factor determining species' distributions, primarily for Atlantic sharpnose Rhizoprionodon terraenovae, blacknose Carcharhinus acronotus, and blacktip C. limbatus sharks. Blacknose sharks had the highest catch per unit effort (CPUE) in the middepth stratum (10–30 m), blacktip sharks had consistently higher CPUE in the shallow depth stratum (<10 m), and Atlantic sharpnose sharks showed high abundance throughout both the shallow and middepth strata. Length frequency and sex ratio analyses suggest that Atlantic sharpnose and blacknose sharks are using waters greater than 30 m deep for parturition, whereas adult blacktip sharks are probably using shallow waters for parturition. Our abundance patterns illustrate a continuum of depth use across the inner continental shelf. Surveys that do not encompass the entirety of this ecosystem fail to accurately characterize the distributions of these important predators.

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Section: Temporally Restricted Comparisons: 2006-2008supporting

confidence: 40%

Distributions of Sharks across a Continental Shelf in the Northern Gulf of Mexico

et al. 2010

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“…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.…”

mentioning

confidence: 99%

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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“…Age and growth of the Atlantic sharpnose shark in the Atlantic Ocean and Gulf of Mexico have been based on vertebral age analysis (Parsons 1983;Branstetter 1987;Carlson and Baremore 2003). The Atlantic sharpnose shark has a maximum length of about 107 cm (42.1 in.)…”

Section: Atlantic Sharpnose Sharkmentioning

confidence: 99%

Fish Resources of the Gulf of Mexico

Chen

2017

Habitats and Biota of the Gulf of Mexico: Before the Deepwater Horizon Oil Spill

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Age and Growth Estimates for Blacktip, Carcharhinus limbatus, and Spinner, C. brevipinna, Sharks from the Northwestern Gulf of Mexico

Cited by 97 publications

References 0 publications

Distributions of Sharks across a Continental Shelf in the Northern Gulf of Mexico

Distributions of Sharks across a Continental Shelf in the Northern Gulf of Mexico

Reproduction of the Blacktip Shark in the Gulf of Mexico

Fish Resources of the Gulf of Mexico

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