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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 BAHARUDDIN1,2*, MOHAMED RIZMAN-IDID2,3, 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
4Protein Lab, Department
of Molecular Medicine, Faculty of Medicine, University of Malaya
50603 Kuala Lumpur, Malaysia Received: 15 October 2013/Accepted: 31 March 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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*Corresponding author; email: haslawati@dof.gov.my
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