Taxonomic observations on stingrays of the genus Dasyatis (Chondrichthyes: Dasyatidae) in the Gulf of Gabès (Southeastern Mediterranean Sea)

Saadaoui, Abdesselem; Saïdi, Béchir; Elglid, Aziza; Séret, Bernard; Bradai, Mohamed N.

doi:10.11646/zootaxa.4173.2.1

Cited by 9 publications

(9 citation statements)

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“…Among the top matches for the Dasyatidae samples (homology ≥ 98%) were D. pastinaca, D. tortonesei, D. marmorata, and Taeniura grabata. In the past, the taxonomic status of D. pastinaca and D. tortonesei has been questioned (Tortonèse, 1987;Compagno, 1999b;Serena, 2005), although more recent studies suggest that they are two distinct species (Saadaoui et al, 2016;Vella & Vella, 2021). Among elasmobranchs, difficulties in species identification are occasionally reported with the COI gene, which is partially attributed to the low levels of genetic variation among species (Lopez, Ryburn, Fedrigo, & Naylor, 2006;Veríssimo, Zaera-Perez, & Leslie, 2017;Almerón-Souza et al, 2018).…”

Section: Dna Barcoding and Species Identificationmentioning

confidence: 99%

Flying under the radar: DNA barcoding ray wings in Greece detects protected species and umbrella labelling terms

et al. 2022

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Section: Dna Barcoding and Species Identificationmentioning

confidence: 99%

Flying under the radar: DNA barcoding ray wings in Greece detects protected species and umbrella labelling terms

et al. 2022

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“…), and growth (Von Bertalanffy growth parameters, age at maturity, , etc.). Recently, an attention to the impact of fishery, bycatch, and systematic were observed [11][12][13][14][15][16][17][18][19][20][28][29][30] (Figure 9).…”

Section: Available Data On Elasmobranchs (Bibliographic Analysis)mentioning

confidence: 99%

Elasmobranchs in Tunisia: Status, Ecology, and Biology

Enajjar¹,

Saïdi²,

Bradaï³

2023

Sharks - Past, Present and Future

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The authors have compiled published information on taxonomy, distribution, status, statistics, fisheries, bycatch, biologic, and ecologic parameters mainly on food and feeding habits and reproductive biology of elasmobranchs along the Tunisian coasts. This bibliographic analysis shows that cartilaginous species, including sharks and rays are by far the most endangered group of marine fish, with 63 species, about 53% of all are critically endangered, endangered, or vulnerable. Overfishing, fishing practices, and habitat degradation are leading to dramatic declines of these species. Biologic parameters concern a few species primarily in the Gulf of Gabes. Therefore, recommendations to fill gaps in order to protect and manage elasmobranchs stocks are proposed in this chapter.

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“…Standard measurements included the total length (TL) for sharks and disc width (DW) for batoids. Considering the taxonomic uncertainties within the genera Dasyatis and Squalus (Saadaoui et al, 2016;Kousteni et al, 2016Kousteni et al, , 2021Ebert & Dando, 2020;Serena et al, 2020;Ferrari et al, 2021), two groupings were used: the brown stingray Bathytoshia lata (Garman, 1880), the common stingray Dasyatis pastinaca (Linnaeus, 1758) and the Tortonese's stingray Dasyatis tortonesei Capapé, 1975 were grouped into the species complex Dasyatis spp. while the longnose spurdog Squalus blainville (Risso, 1827) and the shortnose spurdog Squalus megalops (MacLeay, 1881) were grouped into the species complex Squalus spp.…”

Section: Data Collectionmentioning

confidence: 99%

Vulnerability of elasmobranchs caught as bycatch in the grouper longline fishery in the Gulf of Gabès, Tunisia

2023

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The present study aims to quantify the effect of the grouper demersal longline fishery to elasmobranchs in the Gulf of Gabès to support future conservation actions for the most vulnerable species. Data from 162 demersal longline sets carried out during the grouper fishing seasons in 2016 and 2017 were analyzed. At least 17 elasmobranch species were caught, representing about 50% of the total catch in number which exceeded the target catch of groupers Epinephelus spp. (44.15%). Elasmobranchs were present in 139 (85.80%) out of the 162 examined sets, while the frequency of occurrence per set varied greatly depending on the species. The nominal Catches Per Unit Effort of all species combined was 3.07 specimens per 1,000 hooks/hour of fishing. Sharks and batoids contributed equally to the total elasmobranch catch, comprising 51.84% and 48.16% in terms of number, respectively. Mustelus mustelus, Carcharhinus plumbeus and Squalus spp. were the most abundant species, representing 45.65% of the total elasmobranch catch, whereas the remaining shark species were rarely caught (6.19%). Batoids were dominated by Glaucostegus cemiculus, which represented 19.07% of the total elasmobranch catch in number, followed by Dasyatis spp. (8.91%), Raja clavata (7.1%) and Taeniura grabata (4.59%). The elasmobranchs discarded due to their low commercial value and/or small size represented 11.34% of the total catch in number. According to the results of the Productivity and Susceptibility Analysis, the coastal viviparous elasmobranch species in the study area are highly vulnerable to the grouper longline fishery activity and should be carefully managed to reduce the likelihood of overfishing.

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Taxonomic observations on stingrays of the genus Dasyatis (Chondrichthyes: Dasyatidae) in the Gulf of Gabès (Southeastern Mediterranean Sea)

Cited by 9 publications

References 0 publications

Flying under the radar: DNA barcoding ray wings in Greece detects protected species and umbrella labelling terms

Flying under the radar: DNA barcoding ray wings in Greece detects protected species and umbrella labelling terms

Elasmobranchs in Tunisia: Status, Ecology, and Biology

Vulnerability of elasmobranchs caught as bycatch in the grouper longline fishery in the Gulf of Gabès, Tunisia

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