The Angel Shark, Squatina dumeril, in Southern New England Waters

Merriman, Daniel; Olsen, Yngve H.

doi:10.2307/1438993

Cited by 5 publications

(3 citation statements)

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“…It was also noted that the highest catch rates were at sites close to strong thermal fronts, which may be related to their prey species being found either in a greater abundance or at a higher density in such areas (Vögler et al, 2008). In terms of habitat, Feder et al (1974) and Fouts and Nelson (1999) Atlantic, Merriman (1949) reported that the capture of S. dumeril was from fine ground adjacent to a rocky area.…”

Section: Habitatmentioning

confidence: 96%

“…For example, Shelmerdine and Cliff (2006) reported the average numbers of yolk-filled follicles in the ovaries of S. africana were 5.5 (left ovary) and 3.1 (right ovary). In other species (e.g., S. occulta, S. dumeril and S. guggenheim) there is a single functional ovary on the left-hand side (Awruch et al, 2008;Baremore, 2010;Bridge et al, 1998;Capapé et al, 1990Capapé et al, , 1999Capapé et al, , 2005Merriman & Olsen, 1949;Vooren & da Silva, 1991). These differences might not always be species-specific, as Natanson and Cailliet (1986) reported that S. californica could have one or two functional ovaries.…”

Section: Reproductive Biologymentioning

confidence: 99%

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Angel sharks (Squatinidae): A review of biological knowledge and exploitation

Ellis

Barker

Phillips

et al. 2021

Journal of Fish Biology

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Angel sharks (Squatina spp.) are distributed in warm temperate to tropical waters around the world. Many species occur in shelf seas and exhibit seasonal inshoreoffshore migrations, moving inshore to give birth. Consequently, there can be high spatial overlap of angel shark populations with fisheries and other human activities. Their dorso-ventrally flattened body shape, large size (most species attain >100 cm total length, L T) and demersal nature means that they may be taken in a variety of demersal fishing gears from birth. Available data indicate that angel sharks typically have a biennial reproductive cycle, with litter sizes generally <20 and the young born at c. 20-30 cm. The biological characteristics of angel sharks render them susceptible to overexploitation, as exemplified by the decline of Squatina squatina from many parts of its former range in the northeast Atlantic and Mediterranean Sea. Currently, half of the 22 recognized extant species of angel shark are classed as Threatened on the International Union for Conservation of Nature (IUCN) Red List (with a further three classified as Data Deficient). Given the biological vulnerability of angel sharks, and that many species are data-limited, the current paper provides a review of available biological information and fisheries data pertaining to this family.

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Section: Habitatmentioning

confidence: 96%

Section: Reproductive Biologymentioning

confidence: 99%

Angel sharks (Squatinidae): A review of biological knowledge and exploitation

Ellis

Barker

Phillips

et al. 2021

Journal of Fish Biology

View full text Add to dashboard Cite

show abstract

“…Other species in the genus with 2 functional ovaries are the sawback angel shark S. aculeata (Capapé et al 2005), the African angel shark S. africana (Bass et al 1975), S. argentina (Vooren & da Silva 1991), the smoothback angel shark S. oculata (Capapé et al 2002) and the ornate angel shark S. tergocellata (Bridge et al 1998). This characteristic, however, is not consistent in the genus, and several species have been reported with only the left complex active: S. argentina (Cousseau 1973), S. guggenheim (Vooren & da Silva 1991, Sunyem & Vooren 1997, Colonello et al 2007, Awruch et al 2008, the hidden angel shark S. occulta (Vooren & da Silva 1991, Sunyem & Vooren 1997, S. dumeril (Merriman & Olsen 1949, Backus 1957, Hoese 1962, Baremore 2010 and S. californica (Natanson & Cailliet 1986). Cousseau (1973) and Vooren & da Silva (1991) revealed a different functionality for each studied distribution of S. argentina.…”

Section: Female Reproductive Tract and Conditionsmentioning

confidence: 98%

Sexual development and maturity scale for the angel shark Squatina squatina (Elasmobranchii: Squatinidae), with comments on the adequacy of general maturity scales

Osaer¹,

Narváez²,

Pajuelo³

et al. 2015

Sex. Early. Dev. Aquat. Org.

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Occurrence of an Intersexual Blacktip Shark in the Northern Gulf of Mexico, with Notes on the Standardization of Classifications for This Condition in Elasmobranchs

et al. 2013

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An intersexual Blacktip Shark Carcharhinus limbatus with a testis, immature female reproductive tracts (embedded), and claspers was caught in the Gulf of Mexico. Histology of the single gonad revealed that all stages of spermatogenesis were occurring; however, the absence of ovaries and a male duct system suggests that neither sex would have been functional in this individual. Intersexuality has been reported in 17 families and 36 species of elasmobranchs. The degree to which the different sexes are present in a given individual is often difficult to categorize by normal hermaphroditic standards, as this is typically an anomalous presentation in elasmobranchs. Therefore, this report provides three categories for classification (basic, incomplete, and complete intersexuality) to standardize terminology and allow for more precise comparisons to be made among elasmobranch examples. Basic intersexuals have gonadal tissue of only one sex and a combination of other male and female characters with neither or only one sex being complete. Incomplete intersexuals have gonadal tissue of both sexes and a combination of other male and female characters; however, neither or only one sex is complete. Complete intersexuals have claspers as well as gonadal tissue and tracts for both sexes. The majority of the reported intersexual elasmobranchs, including the shark described here, are basic intersexuals. Received September 30, 2012; accepted April 17, 2013

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The Angel Shark, Squatina dumeril, in Southern New England Waters

Cited by 5 publications

References 0 publications

Angel sharks (Squatinidae): A review of biological knowledge and exploitation

Angel sharks (Squatinidae): A review of biological knowledge and exploitation

Sexual development and maturity scale for the angel shark Squatina squatina (Elasmobranchii: Squatinidae), with comments on the adequacy of general maturity scales

Occurrence of an Intersexual Blacktip Shark in the Northern Gulf of Mexico, with Notes on the Standardization of Classifications for This Condition in Elasmobranchs

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