Two thirds of species in a global shark fin trade hub are threatened with extinction: Conservation potential of international trade regulations for coastal sharks

Conservation Letters, Год журнала: 2022, Номер 15(5)

Опубликована: Июль 11, 2022

Abstract One third of chondrichthyan species (sharks, rays, and chimeras) are threatened with extinction, mainly due to unsustainable fishing. Large accessible international markets for meat luxury products like dried fins can help drive overfishing by encouraging targeted capture or retention high‐value export species. If this is common, then in trade could have heightened extinction risk. Here, we examined the composition Hong Kong shark fin market from 2014 2018, finding that traded disproportionately occur categories (70.9%) all premium value threatened. A small number cosmopolitan dominate trade, but noncosmopolitan coastal still at concerning levels given their limited distribution. These not generally subject prohibitions, fisheries management, regulations without management many become extinct. The conservation potential alone chondrichthyans depends on extent which driven markets; socioeconomic studies fishing communities needed make determination. Nonetheless, adding more prompt broad engagement nations lacking effective management.

Язык: Английский

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Hunt for the Easter Sharks: A genetic analysis of shark and ray meat markets in Guatemala

Fisheries Research, Год журнала: 2025, Номер 283, С. 107300 - 107300

Опубликована: Фев. 16, 2025

Язык: Английский

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Length-Based Assessment Methods for the Conservation of a Pelagic Shark, Carcharhinus falciformis from the Tropical Pacific Ocean

Fishes, Год журнала: 2022, Номер 7(4), С. 184 - 184

Опубликована: Июль 25, 2022

The silky shark, Carcharhinus falciformis is one of the most heavily exploited sharks, being main by-catch species in both tuna longline and purse-seine fisheries tropical waters worldwide. Despite this severe exploitation, little known about species’ life history population status. Silky like many other exhibit slow growth low fecundity, indicating urgency developing assessment studies to aid implementation conservation plans for their stocks. Because information on catch effort scarce, some length-based data-limited methods were applied present study provide estimates status Pacific shark population. As evident from LBSPR analysis, current spawning potential ratio (SPR) was found be below target reference point SPR 40% slightly above limit 20%. In addition, LBB model also confirmed that stock’s overfished with relatively biomass levels. Furthermore, models showed size selectivity at 50% 95% lower than estimated sexual maturity. conclusion, developed indicated stock Ocean may risk further decline. Additionally, results show recruitment overfishing occurring shark’s calling immediate intensification monitoring programs these sharks as a pre-requisite develop efficient management Ocean.

Язык: Английский

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DNA Barcoding Identifies Endangered Sharks in Pet Food Sold in Singapore

Frontiers in Marine Science, Год журнала: 2022, Номер 9

Опубликована: Март 4, 2022

Shark populations have declined by more than 70% over the past 50 years. These declines largely been attributed to increases in fishing efforts. Despite increased public awareness surrounding conservation of sharks, three-quarters all oceanic shark species are currently considered at risk extinction. Here, we use DNA barcoding identify found pet food purchased within Singapore. We identified a number sharks that some degree control their trade exerted under auspices Convention on International Trade Endangered Species Wild Fauna and Flora (CITES), or through classification as threatened Union for Conservation Nature (IUCN). The most commonly was blue shark, Prionace glauca , is not listed CITES classified IUCN, but one which scientific evidence suggests overexploited should its catch regulated. second encountered Appendix II silky Carcharhinus falciformis. None products specifically an ingredient, listing only generic terms, such “ocean fish,” “white bait.” vague terminology used describe ingredients, cases, mislabeling contents, prevents consumers – this case, owners from making informed environmentally conscious decisions; consequently, animal lovers may unwittingly be contributing overfishing endangered sharks.

Язык: Английский

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Extinction risk, reconstructed catches and management of chondrichthyan fishes in the Western Central Atlantic Ocean

Fish and Fisheries, Год журнала: 2022, Номер 23(5), С. 1150 - 1179

Опубликована: Июнь 23, 2022

Abstract Chondrichthyan fishes are among the most threatened vertebrates on planet because many species have slow life histories that outpaced by intense fishing. The Western Central Atlantic Ocean, which includes Greater Caribbean, is a hotspot of chondrichthyan biodiversity and abundance, but has been characterized extensive shark ray fisheries lack sufficient data for effective management conservation. To inform future research decisions, we analysed patterns in extinction risk, reconstructed catches engagement this region. We summarized risk 180 sharks, rays chimaeras, including 66 endemic 14 near‐endemic species, using contemporary IUCN Red List assessments. Over one‐third (35.6%) were assessed as Vulnerable, Endangered or Critically Endangered, primarily due to overfishing. Reconstructed from 1950 2016 peaked 1992, then declined 40.2% thereafter. United States, Venezuela Mexico responsible region hosted largest proportions regional distributions largely having coastal habitats their Exclusive Economic Zones. quantity taxonomic resolution landings poor much region, national‐level regulations varied widely across jurisdictions. Deepwater represent an emerging threat, although deepwater chondrichthyans currently refuge beyond depths fisheries. Regional collaboration well enforceable informed more complete data, particularly small‐scale fisheries, required protect recover ensure sustainable

Язык: Английский

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Longest recorded migration of a silky shark (Carcharhinus falciformis) reveals extensive use of international waters of the Tropical Eastern Pacific

Journal of Fish Biology, Год журнала: 2024, Номер 105(1), С. 378 - 381

Опубликована: Май 17, 2024

Despite being a heavily fished species, little is known about the movements of silky sharks (Carcharhinus falciformis). In this study, we report longest (in duration and distance traveled) most spatially extensive recorded migration for shark. This shark, tagged with fin-mount satellite transmitter at Galapagos Islands, traveled >27,666 km over 546 days, making two westerly migrations into international waters as far 4755 from tagging location. These in an area high fishing effort highlights importance understanding shark to inform management practices.

Язык: Английский

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What Is in Your Shark Fin Soup? Probably an Endangered Shark Species and a Bit of Mercury

Animals, Год журнала: 2022, Номер 12(7), С. 802 - 802

Опубликована: Март 22, 2022

Shark fin soup, consumed by Asian communities throughout the world, is one of principal drivers demand shark fins. This near USD 1 billion global industry has contributed to a population declines up 70%. In an effort arrest these declines, trade in several species sharks regulated under auspices Convention on International Trade Endangered Species Wild Fauna and Flora (CITES). Despite this legal framework, dried fins trade-regulated are frequently sold markets soup. found soups break down into fibrous mass ceratotrichia, meaning that identifying soup becomes impossible visual methods. paper, we use DNA barcoding identify bowls collected Singapore. The most common identified our samples was blue (Prionace glauca), listed as Near Threatened Union for Conservation Nature (IUCN) Red List with decreasing population, which scientific data suggests catch limits should be imposed. We four other CITES Appendix II, total ten assessed Critically Endangered, or Vulnerable IUCN Species. Globally, been shown contain levels mercury exceed safe dose limits. Given prevalence examined nature trade, it extremely likely consumers will exposed unsafe neurotoxin.

Язык: Английский

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Size distribution patterns of silky shark Carcharhinus falciformis shaped by environmental factors in the Pacific Ocean

The Science of The Total Environment, Год журнала: 2022, Номер 850, С. 157927 - 157927

Опубликована: Авг. 10, 2022

Язык: Английский

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From molecule to conservation: DNA-based methods to overcome frontiers in the shark and ray fin trade

Conservation Genetics Resources, Год журнала: 2021, Номер 13(2), С. 231 - 247

Опубликована: Фев. 6, 2021

Язык: Английский

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Anguillids in the upper Nu–Salween River, South-East Asia: species composition, distributions, natal sources and conservation implications

Marine and Freshwater Research, Год журнала: 2023, Номер 74(7), С. 614 - 624

Опубликована: Апрель 17, 2023

Context Anguillids are ecologically and commercially important fishes in the Indo-Pacific, but river fragmentation threatens their populations. The free-flowing large river, Nu–Salween River, may be last remaining habitat within China. Aims This study investigated species composition, distributions natal sources of anguillids from River. Methods We adopted a convolutional neural network (i.e. morphology–molecule network, MMNet) integrating morphological molecular data to identify eel specimens collected upper reach 2017 2021. Key results Three anguillid (187 individuals Anguilla bengalensis, 34 bicolor 25 marmorata) were identified using integrative taxonomy. MMNet method, with accuracies exceeding 99.90%, outperformed methods or alone for each three species. A. bengalensis has widest distribution range, whereas marmorata have narrower ranges new this region. These riverine eels parts widespread Indo-Pacific metapopulations. Conclusions upstream expansions likely due climate change anthropogenic disturbances. Implications argue that River is key migratory surrounding should maintained as because neighbouring rivers increasingly dammed.

Язык: Английский

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