The angel shark Squatina squatina prey of the isopod Aegapheles deshaysiana

Osaer, Filip; Narváez, Krupskaya

doi:10.1007/s12526-015-0358-0

Cited by 3 publications

(3 citation statements)

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“…Such reporting has also been extended to the related species, S. oculata and S. aculeata, which are still present in the eastern parts of the Mediterranean Sea (e.g., Başusta, 2002Başusta, , 2016Corsini & Zava, 2007;Ergenler et al, 2020;Ergüden et al, 2019;Filiz et al, 2005;Zava et al, 2016) and north coast of Africa (e.g., Giovos et al, 2019). S. squatina is locally common around the Canary Islands, which has facilitated an increased number of scientific investigations on the species (e.g., Escánez Pérez et al, 2016;Jiménez-Alvarado et al, 2020;Meyers et al, 2017;Osaer et al, 2015;Osaer & Narváez, 2016). was only reported through UVC, which may relate to divers being better able to observe cryptic species.…”

Section: Historical Informationmentioning

confidence: 99%

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: Historical Informationmentioning

confidence: 99%

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

Ellis

Barker

Phillips

et al. 2021

Journal of Fish Biology

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“…It is more likely a result of the rarity of scientific production related to elasmobranchs in the Canary Islands. In this sense, recently, Osaer and Narváez (2016) and Narváez and Osaer (2016) identified the first common micropredator and parasite, respectively, for S. squatina in the Canary Islands.…”

Section: Resultsmentioning

confidence: 98%

The marine leech Branchellion torpedinis parasitic on the angelshark Squatina squatina and the marbled electric ray Torpedo marmorata

Narváez

Osaer

2016

Mar Biodiv

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The marine leech Branchellion torpedinis is parasitic on teleost and elasmobranch species. Reports along its wide distribution range include the Carribean Sea, the Mediterranean Sea, and the west and east coasts of the North Atlantic Ocean. Most of these records are isolated cases and limited just to the mention of the relationship. In this sense, the present communication is a novel report and a reliable, longterm, host-parasite record for the marine leech B. torpedinis based on observations in its natural habitat, and an expansion of the known distribution of this helminth to include the Canary Islands. The leech was observed attached to the dorsum of the angelshark Squatina squatina and of the marbled electric ray Torpedo marmorata during a scuba diving census. No noteworthy aspects were registered in the attachment area, the behavior or apparent fitness of the hosts. These findings are important because it provides useful information about the dispersal patterns of a rare marine leech and its relationship with the hosts, and gives the first insights into a parasite for T. marmorata in the Canary Islands.

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“…Unfortunately, there is a limited knowledge regarding the symbionts associated with elasmobranchs off the Canary Islands. Contributions to the parasitic fauna are limited to two helminths (Narváez and Osaer 2017a, b) and one isopod species (Osaer and Narváez 2016) with no reports of copepods. This low number of reported parasites is most likely due to lack of studies and reports rather than limited parasite diversity (Narváez and Osaer 2017b).…”

Section: Introductionmentioning

confidence: 99%

Symbiotic Siphonostomatoida (Copepoda) of the hammerhead shark species Sphyrna zygaena (Carcharhiniformes: Sphyrnidae) and stingray Dasyatis pastinaca (Myliobatiformes: Dasyatidae) off the Canary Islands, with a re-description of Pseudocharopinus pillaii Kabata, 1979

Dippenaar

Narváez²,

Osaer³

et al. 2021

Parasitol Res

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The biology, including accompanying ectoparasitic fauna, remains unstudied for several elasmobranchs off the Canary Islands in spite of concerns over their conservation. Within this region, this is the first report of copepod associations with these fishes. Twenty smooth hammerhead sharks, Sphyrna zygaena, and one common stingray, Dasyatis pastinaca, were inspected for symbionts on their body surface. Symbiotic siphonostomatoids were collected from 18 S. zygaena hosts and represent two different species, i.e., Alebion crassus (Caligidae) and Pandarus cranchii (Pandaridae). A high prevalence of 90% and a mean infection of 8.3 individuals per infected host were exhibited by A. crassus, while only a single P. cranchii was collected. Both these findings represent new geographical records. Additionally, one free-ranging common stingray Dasyatis pastinaca was opportunistically inspected and 11 Pseudocharopinus pillaii (Lernaeopodidae) collected which constitutes a new host record and a new geographical record. A re-description with detail regarding the morphology of the appendages is provided for the first time. Due to the morphological similarity between P. pillaii and P. malleus, a molecular analysis of the partial mitochondrial DNA cytochrome oxidase I gene was done in an attempt to determine if there is molecular divergence between the two species. This provided an estimate of the phylogenetic relationships amongst four Pseudocharopinus species (P. bicaudatus, P. pteromylaei, P. malleus, and P. pillaii) with Charopinus dubius as an outgroup as an alternative hypothesis to compare with the previous morphological topology estimated for all Pseudocharopinus species.

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The angel shark Squatina squatina prey of the isopod Aegapheles deshaysiana

Cited by 3 publications

References 4 publications

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

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

The marine leech Branchellion torpedinis parasitic on the angelshark Squatina squatina and the marbled electric ray Torpedo marmorata

Symbiotic Siphonostomatoida (Copepoda) of the hammerhead shark species Sphyrna zygaena (Carcharhiniformes: Sphyrnidae) and stingray Dasyatis pastinaca (Myliobatiformes: Dasyatidae) off the Canary Islands, with a re-description of Pseudocharopinus pillaii Kabata, 1979

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