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Author: search.filters.author.Klangnurak, WanladaSubject: search.filters.subject.DNA barcoding

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    Item type:Publication,
    Unveiling the species in shark-based pet snack products with an overview of e-commerce trends
    (2026-01-01)
    Klangnurak, Wanlada
    ;
    Arunrugstichai, Sirachai
    ;
    Manopawitr, Petch
    Shark cartilage and whole-dried small sharks are increasingly being used in Thailand's pet snack market, raising sustainability concerns. This study examined the issues by identifying shark species in cartilage and whole-dried shark products used in pet snacks and analyzing online market trends. A total of 150 shark cartilage and 60 whole-dried shark samples were analyzed using DNA barcoding. Notably, 91 % of the cartilage products were identifiable at the species level, with eight shark species represented. The brown-banded bamboo shark (Chiloscyllium punctatum) and the Australian blackspot shark (Carcharhinus coatesi) were the most common, making up 63.2 % of samples. Of the identified species, 61.8 % are classified as Near Threatened on the IUCN Red List, and 67.7 % are from species listed in CITES Appendix II. All whole-dried sharks were Scoliodon macrorhynchos, also classified as Near Threatened and CITES-listed. Shark cartilage products dominated the market, appearing in 62–65 % of shops, compared to 35–38 % for whole-dried sharks. The findings emphasize the need to strengthen the monitoring and enforcement of CITES-listed sharks, improve traceability and transparency in the supply chain, and regulate the online market for shark-based pet snacks.
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    DNA-based species identification of shark fins traded in thai markets
    (2023-08-01)
    Klangnurak, Wanlada
    ;
    Arunrugstichai, Sirachai
    ;
    Manopawitr, Petch
    ;
    Krajangdara, Tassapon
    Shark fins are among the most highly prized seafood products in the world with massive consumption in Asia over the past several decades. The demand for shark fins is a major driver of the enormous population declines of elasmobranchs that are generally vulnerable to overexploitation. This study aims to better understand the species composition of shark fin products in Thailand and their conservation statuses by using DNA-based species identification. Various types and sizes of shark fins were collected from 4 locations in Thailand. DNA barcoding method based on a fragment of the cytochrome c oxidase subunit I (COI) gene was applied to species identification. Fins from at least 15 shark species were found from Thailand’s markets. The spottail shark (Carcharhinus sorrah) and the night shark (Carcharhinus signatus) were the two dominant species presented in this study. 34% of identifiable samples are the species that have not been record in this region. 62% of species detected from the fin samples are categorized under the threatened categories of IUCN Red List. Species composition reported in shark fin products potentially helps indicate the appropriate conservation action and increases awareness from monitoring the trade in elasmobranch products.