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

IF 1.1 4区生物学 Q3 MARINE & FRESHWATER BIOLOGY

Journal of the Marine Biological Association of the United Kingdom Pub Date : 2023-11-21 DOI:10.1017/s0025315423000796

Remya Lalitha, Sujitha Thomas, Shoba Joe Kizhakudan, Thirumalaiselvan Shanmugam, Gandhi Ayyakannu, Midhun Muthayan, Rajkumar Raja, Vetrivel Vedhagiri, Rajendran Umayan, Shanmuganathan Kalimuthu, Prakash Murugesan

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引用次数: 0

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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印度马纳尔湾的两种濒危鳐的生物学观察和新报道的最大尺寸:华丽的鹰鳐aeetomylaeus vespertilio和红树林刺鳐Urogymnus granulatus

2021年和2022年，在印度泰米尔纳德邦马纳尔湾的Pamban岛，用一天的拖网渔船捕获了创纪录大小的雕鳐aeetomylaeus vespertilio和红树林刺鳐Urogymnus granulatus。所有鱼都在Pamban Therkuvadi鱼类登陆中心(FLC)登陆。最大的雕鳐的碟宽为384厘米，重530公斤，创下了该物种的新纪录，此前报道的最大尺寸为300厘米。该标本于2021年7月19日着陆。该物种的另一个大型标本(重360厘米，重453公斤)于2022年8月12日被捕获并上岸。登陆的红树鞭鱼重153厘米，总重150公斤，大于先前报道的最大尺寸141厘米重。研究了形态计量学、胃内容物和生殖状态。其中一只鹰鳐是一只怀孕的雌性，子宫里有三个足月的胚胎，而whipray是一只已经成年的雌性。鹰鳐胃内的主要猎物种类为大眼棘鱼(Selar crumenophthalmus)。红树林鞭鱼以一系列鱼类(猪脸鲷、山羊鱼、银腹鱼、银臀鱼和小沙丁鱼)和章鱼为食。

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来源期刊

Journal of the Marine Biological Association of the United Kingdom 生物-海洋与淡水生物学

CiteScore

2.30

自引率

8.30%

发文量

审稿时长

3-8 weeks

期刊介绍： JMBA is an international journal, publishing original research on all aspects of marine biology. It includes pioneering work taking place today on major issues concerning marine organisms and their environment. Subjects covered include: ecological surveys and population studies of marine communities; physiology and experimental biology; taxonomy, morphology and life history of marine animals and plants; and chemical and physical oceanographic work. Included with 2010 online subscriptions: Marine Biodiversity Records.