A Revision of the Carcharhinid Shark Genera Scoliodon, Loxodon, and Rhizoprionodon

Springer, Victor G.

doi:10.5479/si.00963801.115-3493.559

Cited by 65 publications

(104 citation statements)

References 1 publication

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“…The Lm 50 of males in this study was 59.5 (55-60) cm TL, which is larger than previously reported for this species by Springer (1964) who reported males maturing as small as 38 cm TL. Length at maturity of males were estimated at 29-38 cm TL in India (Appukuttan and Nair, 1988); 43-45 cm TL with Lm 50 at 53 cm in Indonesia (White, 2007), Lm 50 at 53 cm TL in Kuwait (Moore et al, 2012) and 55 cm TL in Bahrain (Moore and Pierce, 2013).…”

Section: Length-weight Relationshipscontrasting

confidence: 52%

“…In the north-eastern Arabian Sea of Indian EEZ, R. oligolinx is one of the most common sharks having a relatively high economic value for fin and salted meat, caught dominantly by gillnetters operating in the inshore waters. Studies on the distribution and taxonomic account of R. oligolinx are limited (Springer, 1964;Nair et al, 1974;Talwar, 1976;Raje et al, 2007) and studies on biology are rare (Appukuttan and Nair, 1988;White, 2007;Moore et al, 2012) that can support management decisions.…”

Section: Introductionmentioning

confidence: 99%

“…The genus Rhizoprionodon Whitley, 1929, commonly called requiem sharks, is distributed worldwide, comprising small to moderately large sharks, which are most abundant in inshore coastal waters (Springer, 1964;Compagno, 1988;Simpfendorfer, 1992). Grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 is a small and common shark occurring in the littoral, inshore and offshore regions of continental and insular shelves in the tropical Indo-West Pacific (Ebert et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 is a small and common shark occurring in the littoral, inshore and offshore regions of continental and insular shelves in the tropical Indo-West Pacific (Ebert et al, 2013). In the north-eastern Arabian Sea of Indian EEZ, R. oligolinx is one of the most common sharks having a relatively high economic value for fin and salted meat, caught dominantly by gillnetters operating in the inshore waters.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reproductive biology and diet of the grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 (Chondrichthyes: Carcharhinidae) from the north-eastern Arabian Sea

et al. 2017

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Information on reproductive biology is presented for the grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 (Chondrichthyes: Carcharhiniformes), collected off the north-west coast of India in the Arabian Sea. A total of 711 individuals, of 27.0 to 93.0 cm total length (TL), 180 to 2600 g total weight (TW) were used for the study. The lengthweight relationships were significantly different between the sexes. The size-at-maturity (Lm 50 ) for females and males was estimated to be 62.3 and 59.5 cm TL respectively. Number of embryos ranged from 1 to 7 and the size at birth was estimated between 25 to 30 cm TL. Overall sex ratio favoured the females slightly at the rate of 1.27:1. There was significant positive correlation between maternal TL and number of embryos (p<0.001). Dietary analysis of stomach contents (%IRI) revealed that R. oligolinx feeds primarily on teleosts (95.5%), cephalopods (3.2%) and crustaceans (1.2%). This study presents the first detailed biological observation on size, sex composition, size-at-maturity (Lm 50 ) and length-weight relationship of R. oligolinx from the northern Arabian Sea.

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Section: Length-weight Relationshipscontrasting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Reproductive biology and diet of the grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 (Chondrichthyes: Carcharhinidae) from the north-eastern Arabian Sea

et al. 2017

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“…It is also possible that the observed variation in vertebral counts across G. fowlerae, G. gangeticus and G. siamensis represents population differences in vertebral counts in a single wide-ranging species. A vertebral range of 169-209 is not unrealistic for a carcharhinid shark, as some species are known to have relatively large ranges in vertebral numbers, e.g., Loxodon macrorhinus (148-191 total centra) (24) and Scoliodon macrorhynchos (149-171) (25). Further specimens are required to validate this.…”

Section: Discussionmentioning

confidence: 99%

DNA capture reveals transoceanic gene flow in endangered river sharks

Corrigan

Yang

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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For over a hundred years, the "river sharks" of the genus Glyphis were only known from the type specimens of species that had been collected in the 19th century. They were widely considered extinct until populations of Glyphis-like sharks were rediscovered in remote regions of Borneo and Northern Australia at the end of the 20th century. However, the genetic affinities between the newly discovered Glyphis-like populations and the poorly preserved, original museum-type specimens have never been established. Here, we present the first (to our knowledge) fully resolved, complete phylogeny of Glyphis that includes both archival-type specimens and modern material. We used a sensitive DNA hybridization capture method to obtain complete mitochondrial genomes from all of our samples and show that three of the five described river shark species are probably conspecific and widely distributed in Southeast Asia. Furthermore we show that there has been recent gene flow between locations that are separated by large oceanic expanses. Our data strongly suggest marine dispersal in these species, overturning the widely held notion that river sharks are restricted to freshwater. It seems that species in the genus Glyphis are euryhaline with an ecology similar to the bull shark, in which adult individuals live in the ocean while the young grow up in river habitats with reduced predation pressure. Finally, we discovered a previously unidentified species within the genus Glyphis that is deeply divergent from all other lineages, underscoring the current lack of knowledge about the biodiversity and ecology of these mysterious sharks.freshwater sharks | DNA | museum specimens

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The biology and ecology of the Pacific sharpnose shark Rhizoprionodon longurio

Gayford,

Whitehead

2023

Ecology and Evolution

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Amidst global declines in elasmobranch populations resulting predominantly from overfishing, the need to gather data regarding shark ecology is greater than ever. Many species remain data deficient or at risk of going extinct before sufficient conservation measures can be applied. In this review, we summarise existing knowledge regarding the biology and ecology of the Pacific sharpnose shark Rhizoprionodon longurio (Jordan & Hilbert, 1882), a small‐bodied carcharhinid shark found in coastal waters of the Eastern Tropical Pacific Ocean that is of both commercial and ecological importance. We compare ecological parameters of this species with its closest extant relatives and identify major knowledge gaps and avenues for future research. In particular, additional studies investigating the behavioural and sensory ecology, as well as potential migratory patterns of the species are needed. Such studies will not only improve our understanding of R. longurio, but provide insight into the extent to which the numerous studies performed on a close relative—Rhizoprionodon terraenovae—provide an accurate representation of the biology and ecology of Rhizoprionodon and carcharhinids more generally.

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A Revision of the Carcharhinid Shark Genera Scoliodon, Loxodon, and Rhizoprionodon

Cited by 65 publications

References 1 publication

Reproductive biology and diet of the grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 (Chondrichthyes: Carcharhinidae) from the north-eastern Arabian Sea

Reproductive biology and diet of the grey sharpnose shark Rhizoprionodon oligolinx Springer, 1964 (Chondrichthyes: Carcharhinidae) from the north-eastern Arabian Sea

DNA capture reveals transoceanic gene flow in endangered river sharks

The biology and ecology of the Pacific sharpnose shark Rhizoprionodon longurio

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