New record of a sharpnose sevengill shark <i>Heptranchias perlo</i> (Elasmobranchii, Hexanchidae) from the Balearic Sea, western Mediterranean Sea

Guallart, Javier; Morey, Gabriel; Bartolí, Àlex

doi:10.1111/jfb.13905

Cited by 7 publications

(9 citation statements)

References 15 publications

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“…An example is the bluntnose sixgill shark (Hexanchus griseus), which is abundant in the Mediterranean by direct observation of bycatch by the trawl fleet in the area [21], but still very difficult to study and observe in situ. The challenge is now to obtain more in situ images and contribute to a better knowledge of these and other rare species, such as the seven-gill shark (Heptranchias perlo) [38] in the Balearic Island waters.…”

Section: Discussionmentioning

confidence: 99%

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Improved Baited Remote Underwater Video (BRUV) for 24 h Real-Time Monitoring of Pelagic and Demersal Marine Species from the Epipelagic Zone

Prat-Varela¹,

Torres²,

Cervantes³

et al. 2023

JMSE

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Bait-based remote underwater video (BRUV) systems are effective devices for remotely observing fish and other marine organisms in challenging environments. The development of a long duration (24 h) surface BRUV observation surveys allowed the monitoring of scarce and elusive pelagic sharks and the direct impact on non-targeted species of longline fishing in the Western Mediterranean. Technological limitations, such as the limited storage capacity and a single surface camera, were improved by (i) adding a deep camera equipped with light (below 80 m depth) and (ii) replacing Gopros with a multi-camera video surveillance system (surface and depth) with a storage capacity of several days and access to real-time observation. Based on a deployment effort of 1884 h video data, we identified 11 blue sharks (Prionace glauca) and one bluntnose sixgill shark (Hexanchus griseus), a deep-sea species that scarcely swims at the surface. The real-time observation capability was a powerful tool for reducing logistical costs and for raising environmental awareness in educational and outreach programmes.

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Section: Discussionmentioning

confidence: 99%

“…The Balearic Archipelago is located in the Western Mediterranean. The waters surrounding the archipelago are a biodiversity hotspot where twenty species of sharks have been documented, including endangered and rare species [20,[35][36][37][38].…”

Section: Study Site and Sampling Effortmentioning

confidence: 99%

Improved Baited Remote Underwater Video (BRUV) for 24 h Real-Time Monitoring of Pelagic and Demersal Marine Species from the Epipelagic Zone

Prat-Varela¹,

Torres²,

Cervantes³

et al. 2023

JMSE

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“…Capapé et al, 2018;Karachle et al, 2020;Lipej & Mavrič, 2022). Both individuals had a symphysial tooth in the lower jaw, a characteristic occasionally absent in the species (Guallart et al, 2019). Their stomach contents comprised partially digested southern shortfin squids, Illex coindetii (Vérany, 1837).…”

Section: Pathological Melanomacrophage and Morphological Examinationmentioning

confidence: 99%

“…The sharpnose sevengill shark, Heptranchias perlo (Bonnaterre, 1788), is a small yet voracious shark found worldwide, except for the northeast Pacific (Guallart et al, 2019). This shark is (bathy)demersal, primarily inhabiting outer shelves and upper slopes from depths of 180 to 450 m (Castro et al, 1999) but can be found at depths ranging from 0 to 1000 m (Hennemann, 2001).…”

Section: Introductionmentioning

confidence: 99%

Exploring the elusive deep‐sea sharpnose sevengill shark (Heptranchias perlo) in the Adriatic Sea: Novel records, health assessments and conservation implications

Gajić

2024

Aquatic Conservation

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The sharpnose sevengill shark (Heptranchias perlo) is a rare and poorly understood deep‐sea species, with only a few records in the Adriatic Sea over the last two centuries and a significant gap in sightings. Throughout 2023, three new records are documented in the southernmost Adriatic Sea, found at depths ranging from 391 to 452 m off Vlorë. This study marks the first comprehensive health examination of a deep‐sea shark, investigating potential trauma and injuries resulting from trawling. It encompasses pathological and histopathological examinations, supplemented by magnetic resonance imaging (MRI). The research highlights alarming post‐capture mortality rates in this data deficient species, discusses further conservation implications, and proposes protective measures for the species. Beyond addressing critical knowledge gaps, this study advocates for collaborative efforts with local fishermen to establish long‐term monitoring and obtain data on the frequency and abundance of elusive species.

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“…The deep-water little sleeper shark, Somniosus rostratus (Risso, 1827), is a rare or apparently rare chondrichthyan (Garibaldi et al 2012;Guallart et al 2013), currently assessed at the global level as Least Concern by the IUCN Red List (Finucci et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Additional records of the little sleeper shark, Somniosus rostratus (Elasmobranchii: Squaliformes: Somniosidae), in Mediterranean Sea

Insacco,

Zava,

Spadola

et al. 2024

AIeP

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This study investigates the distribution and morphometrics of the little sleeper shark, Somniosus rostratus (Risso, 1827), in the Mediterranean Sea. Ten sharks caught as bycatch between 2009 and 2019 in the northern sectors of the Strait of Sicily, the south Tyrrhenian Sea, the northwestern Ionian Sea, and the south Adriatic Sea using drifting longlines, as well as five retrieved from the Tripoli (Libya) marketplace, were morphologically confirmed to represent S. rostratus. The sharks exhibited typical characteristics for this species and were all caught from deep waters, indicating a potential mesopelagic habit. The study also utilized literature reviews and global databases for a comprehensive mapping of S. rostratus distribution in the Mediterranean Sea, which revealed sporadic occurrences in the eastern Mediterranean and an absence in the north Adriatic Sea. Morphometric data provided insights into the reproductive characteristics of S. rostratus. The study highlights the ecological significance of the Strait of Sicily (Central Mediterranean Sea) for the species, indicating it as a likely spawning area, and underscores the impact of the interactions between sharks and pelagic drifting swordfish fisheries in the Mediterranean, which result in increased mortality rates for threatened shark and ray species. Prioritizing conservation measures for endangered elasmobranch populations is crucial for maintaining marine ecosystem balance and ensuring fishery resource sustainability.

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New record of a sharpnose sevengill shark Heptranchias perlo (Elasmobranchii, Hexanchidae) from the Balearic Sea, western Mediterranean Sea

Cited by 7 publications

References 15 publications

Improved Baited Remote Underwater Video (BRUV) for 24 h Real-Time Monitoring of Pelagic and Demersal Marine Species from the Epipelagic Zone

Improved Baited Remote Underwater Video (BRUV) for 24 h Real-Time Monitoring of Pelagic and Demersal Marine Species from the Epipelagic Zone

Exploring the elusive deep‐sea sharpnose sevengill shark (Heptranchias perlo) in the Adriatic Sea: Novel records, health assessments and conservation implications

Additional records of the little sleeper shark, Somniosus rostratus (Elasmobranchii: Squaliformes: Somniosidae), in Mediterranean Sea

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