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Biological observations and new maximum reported sizes for two threatened rays: ornate eagle ray Aetomylaeus vespertilio and mangrove whipray Urogymnus granulatus from the Gulf of Mannar, India
Published online by Cambridge University Press: 21 November 2023
Abstract
Record-sized specimens of the ornate eagle ray Aetomylaeus vespertilio and mangrove whipray Urogymnus granulatus were caught by single-day trawlers off Pamban Island in the Gulf of Mannar, Tamil Nadu, India during 2021 and 2022. All were landed at the Pamban Therkuvadi Fish Landing Centre (FLC). The largest ornate eagle ray was 384 cm disc width (DW) and weighed 530 kg, setting a new global record for the species, as the previous maximum size was reported to be 300 cm DW. This specimen was landed on 19 July 2021. Another large specimen of this species (360 cm DW and total weight of 453 kg) was caught and landed on 12 August 2022. The landed mangrove whipray was 153 cm DW and 150 kg total weight, larger than the previously reported maximum size of 141 cm DW. The morphometrics, stomach contents and reproductive state were studied. One of the eagle rays was a pregnant female with three full-term embryos in the uterus, while the whipray was a spent female. The main prey species in the stomach of eagle ray was big-eye scad Selar crumenophthalmus. The mangrove whipray had fed on a range of fish (pigface bream, goatfish, silverbellies, silverbiddies and lesser sardine) and octopus.
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- Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom
References
Benjamin, DJV, Jose, RD, Kurup, MB and Harikrishnan, M (2012) Morphometric characteristics of the ornate eagle ray Aetomylaeus vespertilio (Bleeker, 1852) caught off Cochin, Southwest coast of India. International Journal of Environmental Science 3, 685–688.Google Scholar
Bineesh, KK, Akhilesh, KV, Sajeela, KA, Abdussamad, EM, Gopalakrishnan, A, Basheer, VS and Jena, JK (2014) DNA barcoding confirms the occurrence rare elasmobranchs in the Arabian Sea of Indian EEZ. Middle-East Journal of Scientific Research 19, 1266–1271.Google Scholar
Kumaraguru, AK, Edwin, JV, Marimuthu, N and Jerald, WJ (2006) Scientific Information on Gulf of Mannar – A Bibliography. Ramanathapuram: Gulf of Mannar Marine Biosphere Reserve Trust.Google Scholar
Last, PR (2016) Mangrove whipray Urogymnus granulatus (Macleay, 1883). In Last, PR, White, WT, de Carvalho, MR, Seret, B, Stehmann, MFW and Naylor, GJP (eds), Rays of the World. Clayton South VIC 3169, Australia: Comstock Publishing, pp. 616.CrossRefGoogle Scholar
Last, P, White, W, de Carvalho, M, Seret, B, Stehmann, M and Naylor, G (2016) Rays of the World. Clayton: CSIRO Publishing.CrossRefGoogle Scholar
Manjaji Matsumoto, BM, White, WT, Fahmi Ishihara, H and Morgan, DL (2020) Urogymnus granulatus (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2020: e.T161431A177282313. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T161431A177282313.en. Accessed on 06 March 2023.CrossRefGoogle Scholar
Paul, S (2011) Rare occurrence of ornate eagle ray at Cochin Fisheries Harbour. Marine Fisheries Information Service 208, 34–35.Google Scholar
White, WT and Kyne, PM (2016) Aetomylaeus vespertilio. The IUCN Red List of Threatened Species 2016: e.T60121A68607665. https://dx.doi.org/10.2305/IUCN.UK.2016-1.RLTS.T60121A68607665.en. Accessed on 06 March 2023.CrossRefGoogle Scholar
White, WT, Last, PR, Stevens, JD, Yearsley, GK, Fahmi, F and Dharmadi, D (2006) Economically important sharks and rays of Indonesia. [Hiudanpari yang bernilaiekonomispenting di Indonesia]. Monographs, Australian Centre for International Agricultural Research, number 114072.Google Scholar