Sains Malaysiana 43(11)(2014): 1707–1714

The Occurrence of Pangasius polyuranodon Bleeker, 1852 (Teleostei: Pangasiidae) in Peninsular Malaysia with Remarks on the Comparative Morphology with Pseudolais micronemus (Bleeker, 1847)

(Kehadiran Pangasius polyuranodon Bleeker, 1852 (Teleostei: Pangasiidae) di Semenanjung Malaysia dengan Ulasan tentang Morfologi Perbandingan Pseudolais micronemus (Bleeker, 1847))

HASLAWATI BAHARUDDIN^1,2*, MOHAMED RIZMAN-IDID^2,4, SEKARAN MUNIANDY⁴ & MOHD ZAKARIA-ISMAIL²

¹Fisheries Research Institute (Freshwater Division), Glami Lemi, Titi, 71650 Jelebu,

Negeri Sembilan, Malaysia

²Institute of Biological Sciences, University of Malaya, 50603 Kuala Lumpur, Malaysia

³Institute of Ocean and Earth Sciences University of Malaya, 50603 Kuala Lumpur,
Malaysia

⁴Protein Lab, Department of Molecular Medicine, Faculty of Medicine, University of Malaya

50603 Kuala Lumpur, Malaysia

Diserahkan: 15 Oktober 2013/Diterima: 31 Mac 2014

ABSTRACT

This paper presents the first reliable record on the occurrence of the pangasiid catfish, Pangasius polyuranodon, in Peninsular Malaysia. It was previously unnoticed because of misidentification due to its close morphological appearance to Pseudolais micronemus. Pangasius polyuranodon can be positively distinguished from P. micronemus with a combination of characters: Distinctive palatal dentition with a large nearly squared vomerine tooth patch with small lateral palatine toothplates; longer maxillary and mandibular barbels; higher count of anal fin rays; higher counts of gill rakers on the first gill arch. Other characters are: longer caudal peduncle 19.84 ± 24.27% vs 18.35 ± 1.57% standard length (SL); wider anterior snout 35.49-40.60% head length (HL) and wider mouth 45.15-59.65% HL. This finding has important implications for taxonomy and conservation of indigenous Pangasiid catfishes, due to its close morphological appearance to the more abundant P. micronemus but with different biology and ecological behavior, thus necessitating different management and conservation strategies.

Keywords: Conservation; first record; palatal dentition; Pangasius polyuranodon; Pseudolais micronemus

ABSTRAK

Kertas ini mengesahkan kehadiran ikan berduri daripada keluarga pangasiid, Pangasius polyuranodon, di Semenanjung Malaysia. Sebelum ini kehadirannya tidak disahkan kerana kesilapan mengenal pasti ikan ini yang morfologinya sangat menyerupai Pseudolais micronemus. Pangasius polyuranodon boleh dibezakan secara positif daripada P. micronemus dengan gabungan karektor: penggigian palatal jelas dengan tampalan gigi vomer yang besar berbentuk menghampiri segiempat dan gigi palatin kecil; sesungut maksila dan mandibel yang lebih panjang; bilangan ruji sirip anus yang lebih banyak serta bilangan sisir insang yang lebih banyak pada sisir insang yang pertama. Ciri lain adalah: pedunkel kauda yang lebih panjang 19.84 ± 24.27% daripada panjang piawai berbanding 18.35 ± 1.57% panjang piawai (SL) P. micronemus; muncung hadapan lebih lebar 35.49-40.60% panjang kepala (HL) dan mulut yang lebih lebar 45.15-59.65% HL kepala. Keputusan ini memberikan satu implikasi penting untuk taksonomi dan pemuliharaan ikan patin asli (indigenus) di Malaysia, disebabkan rupa morfologi P. polyuranodon yang menyerupai P. micronemus yang lebih kerap ditemui, tetapi perlakuan biologi dan ekologi yang berbeza ini memerlukan pengurusan dan strategi pemuliharaan berlainan.

Kata kunci: Pangasius polyuranodon; pemuliharaan; penggigian palatal; Pseudolais micronemus; rekod pertama

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*Pengarang untuk surat-menyurat; email: haslawati@dof.gov.my