Difficulties associated with modeling growth in the Atlantic angel shark (Squatina dumeril)

Baremore, Ivy E.; Andrews, Kate I.; Hale, Loraine F.

doi:10.1016/j.fishres.2009.06.006

Cited by 12 publications

(13 citation statements)

References 22 publications

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“…Birth mark is roughly at 1000 μm (indicated with red arrow). Image of light microscopy not shown as no bands were visible on the corpus calcareum in this study or in others5253.…”

Section: Figurementioning

confidence: 38%

“…Six species of shark were analysed in this study: Sphyrna zygaena (Smooth Hammerhead) , Charcharodon carcharias (White Shark) , Carcharhinus brevipinna (Spinner Shark) , Heterodontus portusjacksoni (Port Jackson Shark) , Carcharhinus obscurus (Dusky Shark), and Squatina albipunctata (Eastern Angel shark; this genus is known to have no visible growth bands in the corpus calcarum5253 and little known of their biology54). Sharks were caught by the New South Wales (NSW) Shark Meshing (Bather Protection) Program, with the exception of S. albipunctata , which was caught by a commercial fishing trawler near Sydney, Australia.…”

Section: Methodsmentioning

confidence: 99%

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Strontium mineralization of shark vertebrae

Raoult

Peddemors

Zahra

et al. 2016

Sci Rep

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Determining the age of sharks using vertebral banding is a vital component of management, but the causes of banding are not fully understood. Traditional shark ageing is based on fish otolith ageing methods where growth bands are assumed to result from varied seasonal calcification rates. Here we investigate these assumptions by mapping elemental distribution within the growth bands of vertebrae from six species of sharks representing four different taxonomic orders using scanning x-ray fluorescence microscopy. Traditional visual growth bands, determined with light microscopy, were more closely correlated to strontium than calcium in all species tested. Elemental distributions suggest that vertebral strontium bands may be related to environmental variations in salinity. These results highlight the requirement for a better understanding of shark movements, and their influence on vertebral development, if confidence in age estimates is to be improved. Analysis of shark vertebrae using similar strontium-focused elemental techniques, once validated for a given species, may allow more successful estimations of age on individuals with few or no visible vertebral bands.

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“…Birth mark is roughly at 1000 μm (indicated with red arrow). Image of light microscopy not shown as no bands were visible on the corpus calcareum in this study or in others5253.…”

Section: Figurementioning

confidence: 38%

Section: Methodsmentioning

confidence: 99%

Strontium mineralization of shark vertebrae

Raoult

Peddemors

Zahra

et al. 2016

Sci Rep

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show abstract

“…As far as is known, this study represents the first effort at assessing maturation and reproduction among S. dumeril in the southern Caribbean Sea and so contributes towards the limited information available on the species throughout its broader western Atlantic Ocean range (Cervigón & Alcalá, ; Baremore et al ., ; Baremore, ). When considered collectively, the available data imply intraspecific reproductive variability (in both space and time), especially with respect to fecundity and size at maturity.…”

Section: Discussionmentioning

confidence: 98%

Reproductive aspects of the Atlantic angel shark Squatina dumeril in the southern Caribbean Sea

Tagliafico

Rangel

Broadhurst

2017

Journal of Fish Biology

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The maturity and reproduction of the Atlantic angel shark Squatina dumeril were assessed using 77 females (29·2-110·4 cm total length; L ) and 269 males (58·7-108·2 cm L ) harvested by artisanal gillnetters off Venezuela. The biased sex ratio implied segregation or sex-specific gear selectivity. Based on the development of the reproductive tract, 50% L at sexual maturity (L , mean ± s.e.) for females and males were estimated at 86·14 ± 0·64 and 81·55 ± 0·12 cm, respectively. Uterine fecundity ranged between one and six and with a maximum embryo size of 25·7 cm L . Gravid females were observed from August to December, including those close to parturition and while the gestation period was not confirmed, the size of ovarian follicles among some specimens implied protraction. The low fecundity of the species supports close monitoring of catches.

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“…Banding patterns in vertebrae of elasmobranchs may be related to growth in size rather than age (Baremore et al, ; Natanson et al, ; Natanson & Cailliet, ). The fact that some species do not show an annual banding pattern ( e.g ., basking shark Cetorhinus maximus Cetorhinus maximus (Gunnerus 1765) (Natanson et al, )) or exhibit ontogenetic changes in their growth cycle over life history ( e.g ., shortfin mako Isurus oxyrinchus Rafinesque 1810 (Kinney et al, ; Wells et al, )) reinforces the need to confirm the temporal meaning of these growth increments for each species (Natanson, ).…”

Section: Discussionmentioning

confidence: 99%

“…Sphyrna mokarran (Rüppell 1837) (Passerotti et al, 2010,) and S. tiburo (Carlson & Parsons, 1997;Parsons, 1993) have been directly validated Banding patterns in vertebrae of elasmobranchs may be related to growth in size rather than age (Baremore et al, 2009;Natanson et al, 2008;Natanson & Cailliet, 1990). The fact that some species do not…”

Section: Validation Of the Periodicity Of Growth-band Formationmentioning

confidence: 99%

Periodicity of the growth‐band formation in vertebrae of juvenile scalloped hammerhead shark Sphyrna lewini from the Mexican Pacific Ocean

Coiraton

Tovar-Ávila²,

Garcés-García

et al. 2019

Journal of Fish Biology

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The age of 296 juvenile scalloped hammerhead sharks Sphyrna lewini caught by several fisheries in the Mexican Pacific Ocean from March 2007 to September 2017 were estimated from growth band counts in thin‐sectioned vertebrae. Marginal‐increment analysis (MIA) and centrum‐edge analysis (CEA) were used to verify the periodicity of formation of the growth bands, whereas elemental profiles obtained from LA‐ICP‐MS transect scans in vertebrae of 15 juveniles were used as an alternative approach to verify the age of the species for the first time. Age estimates ranged from 0 to 10+ years (42–158.7 cm total length; LT). The index of average percentage error (IAPE 3.6%), CV (5.2%), bias plots and Bowker's tests of symmetry showed precise and low‐biased age estimation. Both MIA and CEA indicated that in the vertebrae of juveniles of S. lewini a single translucent growth band was formed during winter (November–March) and an opaque band during summer (July–September), a period of faster growth, apparently correlated with a higher sea surface temperature. Peaks in vertebral P and Mn content spatially corresponded with the annual banding pattern in most of the samples, displaying 1.19 and 0.88 peaks per opaque band, respectively, which closely matched the annual deposition rate observed in this study. Although the periodicity of growth band formation needs to be verified for all sizes and ages representing the population of the species in the region, this demonstration of the annual formation of the growth bands in the vertebrae of juveniles should lead to a re‐estimation of the growth parameters and productivity of the population to ensure that it is harvested at sustainable levels.

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Difficulties associated with modeling growth in the Atlantic angel shark (Squatina dumeril)

Cited by 12 publications

References 22 publications

Strontium mineralization of shark vertebrae

Strontium mineralization of shark vertebrae

Reproductive aspects of the Atlantic angel shark Squatina dumeril in the southern Caribbean Sea

Periodicity of the growth‐band formation in vertebrae of juvenile scalloped hammerhead shark Sphyrna lewini from the Mexican Pacific Ocean

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