Sains Malaysiana 50(10)(2021): 3153-3158

http://doi.org/10.17576/jsm-2021-5010-26

A New Inland Record of the Bull Shark Carcharhinus leucas (Müller & Henle 1839) from Peninsular Malaysia

(Suatu Rekod Daratan Baru Jerung Lembu Carcharhinus leucas (Müller & Henle 1839) dari Semenanjung Malaysia)

VERYL HASAN¹*, DIAN SAMITRA², MAHENO S. WIDODO³ & PETER GAUSMANN⁴

¹Fisheries and Marine Faculty, Aquaculture Department, Universitas Airlangga, Surabaya, 60115, Indonesia

²Biology Education, STKIP PGRI Lubuklinggau, Lubuklinggau, 31625, Indonesia

³Aquatic Resources Management Department, Fisheries and Marine Science Faculty, Universitas Brawijaya, Malang, 65145, Indonesia

⁴Ruhr University of Bochum, Faculty of Geosciences, Department of Landscape Ecology and Biogeography, Universitätsstraße 150, 44801 Bochum, Germany

Received: 20 July 2021/Accepted: 5 September 2021

ABSTRACT

A single specimen of a bull shark Carcharhinus leucas (Müller & Henle 1839) with c. 102 cm of total length was landed and photographed on 25 March 2019 in Sungai Mawai Lama, about 25 km inland, Kota Tinggi District, Johor, Peninsular Malaysia. This rare finding represents only the second record of C. leucas in inland Peninsular Malaysia. This shark was identified as C. leucas by the snout much shorter than the width of mouth and bluntly rounded, first dorsal fin triangular, rearward sloping, originating over or slightly behind pectoral insertion, second dorsal fin much smaller than the first dorsal fin (< 3.1:1), and lack of an interdorsal ridge. The coloration of fresh specimen: greyish back and white belly, the dark coloration on the tip of the caudal fins and second dorsal fin. This species is currently listed as a vulnerable species based on the IUCN Red List Status. Further study and monitoring are needed to assess the possibility of the importance of Sungai Mawai Lama as critical habitat of C. leucas.

Keywords: Biogeography; Carcharhinidae; elasmobranchs; freshwaters; requiem sharks

ABSTRAK

Satu spesimen tunggal daripada jerung lembuCarcharhinus leucas (Müller & Henle 1839) dengan panjang keseluruhan c. 102 cm telah mendarat dan difotograf pada 25 Mac 2019 di Sungai Mawai Lama, kira-kira 25 km ke daratan, Daerah Kota Tinggi, Johor, Semenanjung Malaysia. Penemuan yang jarang berlaku ini merupakan rekod keduaC. leucas di pedalaman Semenanjung Malaysia. Jerung ini dikenal pasti sebagai C. leucas melalui moncongnya yang jauh lebih pendek daripada lebar mulut dan bulat tumpul, sirip dorsal pertama segitiga, miring ke belakang, bermula dari atas atau sedikit di belakang sisipan sirip pektoral, sirip dorsal kedua jauh lebih kecil daripada sirip dorsal pertama (< 3.1: 1) dan kurang sisi intradorsal. Warna spesimen segar: belakang kelabu hitam dan perut putih, warna gelap di hujung sirip kauda dan sirip dorsal kedua. Spesies ini pada masa ini disenaraikan sebagai hampir terancam berdasarkan Status Senarai Merah IUCN. Kajian lanjut dan pemantauan diperlukan untuk menilai kemungkinan pentingnya Sungai Mawai Lama sebagai habitat C. leucas.

Kata kunci: Air tawar; biogeografi; Carcharhinidae; elasmobrankia; jerung requiem

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*Corresponding author; email: veryl.hasan@fpk.unair.ac.id