Confirmation of hilsa shad (Tenualosa ilisha) in Vietnamese waters: a morphological and genetic analysis

IF 1.1 4区生物学 Q3 MARINE & FRESHWATER BIOLOGY

Journal of the Marine Biological Association of the United Kingdom Pub Date : 2024-04-11 DOI:10.1017/s0025315424000341

Vanthu Giap, Md Rashedur Rahman, Chenhong Li

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引用次数: 0

Abstract

One specimen of tropical shad was caught from the Giang Thanh River, Kien Giang province, Vietnam in a survey on 16 October 2022. We identified the specimen as the hilsa shad, Tenualosa ilisha Hamilton, 1822 using morphological analysis, and further validated by its cytochrome oxidase subunit I (COI) sequence. The specimen was 418 mm long, 1428 g in weight, with a head length of 29.0% and pectoral fin length of 31.1% of its standard length. Notably, the presence of 34 scutes, a higher gill raker count and a caudal fin length within the moderate range for Tenualosa species distinguished it from T. macrura, T. toli and T. reevesii. The COI sequence of the sample matched closely to the T. ilisha. The results confirm that T. ilisha still endures Vietnamese water, where it was thought to be extinct. Climate change and Indo-Pacific Ocean currents may introduce expansion of distribution area of the T. ilisha. Further studies on distribution of the T. ilisha and other Tenualosa species and their dynamics are needed.

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越南水域鲥鱼（Tenualosa ilisha）的确认：形态学和遗传学分析

在 2022 年 10 月 16 日的一次调查中，我们在越南庆江省 Giang Thanh 河捕获了一只热带鲥鱼标本。通过形态分析，我们确定该标本为鲥鱼（Tenualosa ilisha Hamilton，1822），并通过其细胞色素氧化酶亚单位 I（COI）序列进一步验证。该标本长 418 毫米，重 1428 克，头部长度占其标准长度的 29.0%，胸鳍长度占其标准长度的 31.1%。值得注意的是，它有 34 个鳞片，鳃耙数较多，尾鳍长度在 Tenualosa 鱼种的中等范围内，这使它与 T. macrura、T. toli 和 T. reevesii 区分开来。样本的 COI 序列与 T. ilisha 非常吻合。研究结果证实，T. ilisha 在被认为已经灭绝的越南水域仍然存在。气候变化和印度洋-太平洋洋流可能会扩大伊利沙鱼的分布区。需要进一步研究 T. ilisha 和其他 Tenualosa 种类的分布及其动态。

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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.