Contemporary records of the rare and critically endangered angular rough shark, <i>Oxynotus centrina</i> (<scp>L</scp>innaeus, 1758), from the eastern <scp>A</scp>driatic <scp>S</scp>ea

Gajić, Andrej A.; Lelo, Suvad; Joksimović, Aleksandar; Pešić, Ana; Tomanić, Jovana; Beširović, Hajrudin; Dragičević, Branko

doi:10.1111/jfb.14932

Cited by 4 publications

(4 citation statements)

References 10 publications

(8 reference statements)

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“…2). To the best of the authors' knowledge, the smallest individual recorded to date from the Adriatic Sea was 300 mm in total length and weighed 430 g (in Gajić et al, 2021). However, Cugini and De Maddalena (2003) recorded a pregnant female in the Adriatic Sea and suggested that this species is among the rarest sharks in the surveyed area.…”

Section: Resultsmentioning

confidence: 97%

“…It is well known that it does not have any economic value and therefore it is not landed, which could be a possible reason for the rarity of species records records from the eastern Adriatic, suggesting that the species could be less rare than is commonly thought. Such an increase in the number of records might be a result of the more intense usage of citizen science in recent years, as half of the records provided in Gajić et al (2021) come either from direct reports from fishers or from social networks. On the other hand, studies that indicate a very narrow feeding niche, characterized by the consumption of elasmobranch eggs (Guallart et al, 2015;Mulas et al, 2021) could also explain the rarity of this species.…”

Section: Resultsmentioning

confidence: 99%

“…Several records identified in the Adriatic Sea (Cugini and De Maddalena, 2003;Dragičević et al, 2009;Gajić et al, 2021) have considered individuals which were either adults or older juveniles. In a recent work, Soldo & Lipej (2022) mention a record of small pups of O. centrina in the Brač channel (in Croatia), however, with no specific data provided.…”

Section: Introductionmentioning

confidence: 99%

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First documented record of neonate angular roughshark Oxynotus centrina from the eastern Adriatic Sea

Ćetković

Pešić

Joksimović

et al. 2023

Acta Adriat. (Online)

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Many biological aspects of deep-water sharks are poorly known due to their rarity and difficulties in conducting detailed research on them. The angular roughshark (Oxynotus centrina) is a rare species, critically endangered in the Mediterranean Sea, of which records are scarce across this region. Here we present a record of a female neonate O. centrina from the south-eastern Adriatic Sea, caught by a Montenegrin commercial trawler. Scientific observers were present on-board and collected the specimen, which was subsequently analysed in the laboratory. The specimen was 225 mm long (TL), weighed 59.6 g and had an unhealed umbilical scar. To date, records of this species in the Adriatic Sea have comprised of both adult and older juvenile individuals, but no records of neonates were found in the published literature. In this work, the basic biological observations of the specimen are reported.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First documented record of neonate angular roughshark Oxynotus centrina from the eastern Adriatic Sea

Ćetković

Pešić

Joksimović

et al. 2023

Acta Adriat. (Online)

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“…Oxynotus centrina (Linnaeus, 1758) is critically endangered in the Mediterranean Sea, according to the IUCN [12]. Records show a distribution along the entire Croatian coast, with a particular aggregation near the central Adriatic Sea, where many new individuals have been found in recent years [48]. Almost all records are from the last twenty years when the sharks were caught by trawling in water depths between 40 and 125 m. It is included in the Croatian list of strictly protected species (Regulation on strictly protected species, Annex 1, 2013) [83].…”

Section: Squaliformesmentioning

confidence: 99%

Updated Checklist of Chondrichthyan Species in Croatia (Central Mediterranean Sea)

Balàka,

Ugarković,

Türtscher

et al. 2023

Biology

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Almost half of all chondrichthyan species in the Mediterranean Sea are threatened with extinction, according to the IUCN Red List. Due to a substantial lack of access to data on chondrichthyan catches in the Mediterranean Sea, especially of threatened species, the implementation of conservation measures is extremely insufficient. This also concerns the Adriatic Sea. Here we present a detailed and up-to-date assessment of the species occurring in Croatian waters, as the last checklist of chondrichthyans in Croatian waters was conducted in 2009. Occurrence records from historical data, literature and citizen science information have been compiled in order to present a comprehensive list of species occurrences. We found 54 chondrichthyan species between 1822 and 2022, consisting of a single chimaera, 23 rays and skates, and 30 shark species. Here, four additional species are listed but are considered doubtful. Five species are reported here for the first time for Croatian waters that were not listed in the survey from 2009. Nearly one-third of the species reported here are critically endangered in the entire Mediterranean Sea, based on the IUCN Red List. Additionally, we revisited the Croatian records of the sandtiger shark Carcharias taurus Rafinesque, 1810 and discussed its potential confusion with the smalltooth sandtiger shark Odontaspis ferox (Risso, 1810). Our results thus provide novel insights into the historical and current distribution patterns of chondrichthyan fishes in the Croatian Sea and provide a basis for further research as well as conservation measures.

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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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Contemporary records of the rare and critically endangered angular rough shark, Oxynotus centrina (Linnaeus, 1758), from the eastern Adriatic Sea

Cited by 4 publications

References 10 publications

First documented record of neonate angular roughshark Oxynotus centrina from the eastern Adriatic Sea

First documented record of neonate angular roughshark Oxynotus centrina from the eastern Adriatic Sea

Updated Checklist of Chondrichthyan Species in Croatia (Central Mediterranean Sea)

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

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