Malaysian Applied Biology Journal

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36-1-09

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Malays. Appl. Biol. (2007) 36(1): 67–72

ASPECTS ON THE BIOLOGY OF GARRA CAMBODGIENSIS AND MYSTACOLEUCUS MARGINATUS (CYPRINIDAE) FROM ULU DUNGUN, TERENGGANU

MAZLAN, A.G.1*, SAMAT, A.1, AMIRRUDIN, A.2 and ANITA, T.2

1 School of Environmental Studies and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor
2 Unit Penyelidikan Ekosistem Air Tawar (UPEAT), Department of Biological Sciences, Faculty of Science and Technology, University College of Science and Technology Malaysia (KUSTEM), 21030 Kuala Terengganu
*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

ABSTRACT

Several biological aspects of Garra cambodgiensis and Mystacoleucus marginatus collected from Ulu Dungun, Terengganu were studied. G. cambodgiensis is a cyprinid fish species living sedentarily by scraping algae on the cobble stone in the headwater river system. Whereas M. marginatus is a pelagic cyprinid fish species established abundantly along the headwater stream. At the time of sampling (June 2003), the growth conditions for both species were predicted using an allometric length-weight relationship and Fulton Condition Factor (K) mathematical model. The results showed that G. cambodgiensis displayed a fair growth condition with a regression value ‘b’ = 2.414 whilst M. marginatus displayed an outstanding growth condition with ‘b’ = 3.231 respectively. These growth conditions for both species were further confirmed by the Fulton Condition factor values for both species. It is envisaged that the growth conditions of both species were closely related to the mode of feeding established by both species at the time of sampling. This is closely related to annual seasonal cycle. Stomach content and trophic level analysis denoted that G. cambodgiensis is a kind of herbivore whilst M. marginatus is an opportunistic feeder, feeding on plant materials and small aquatic organism.


ABSTRAK

Beberapa aspek biologi Garra cambodgiensis dan Mystacoleucus marginatus yang telah dikumpulkan dari Ulu Dungun, Terengganu telah dikaji. Hasil kajian menunjukkan G. cambodgiensis adalah ikan cyprinid sedentari hidup secara mengikis lapisan algae pada permukaan batu sungai. Manakala M. marginatus adalah ikan cyprinid pelagik yang sangat melimpah dalam sistem ulu sungai. Pada masa kajian dijalankan (Jun 2003), keadaan tumbesaran bagi kedua- dua spesies ikan tersebut diramalkan dengan mengunakan model allometrik perkaitan panjang-berat dan model matematik Faktor Keadaan Fulton (K). Hasil kajian menunjukkan G. cambodgiensis memaparkan keadaan tumbesaran yang biasa seperti mana ditunjukkan oleh nilai pekali regressi ‘b’ = 2.414, manakala M. marginatus pula memaparkan keadaan tumbesaran yang sangat baik dengan nilai ‘b’ = 3.231. Anggaran keadaan tumbesaran bagi kedua-dua spesies ini seterusnya dipastikan lagi dengan nilai-nilai yang diperolehi dari model Faktor Keadaan Fulton. Hasil kajian juga menunjukkan bahawa keadaan tumbesaran bagi sesuatu spesies ikan lebih dipengaruhi oleh tabiat pemakanan masing-masing pada waktu persampelan. Ini adalah berkait rapat dengan kitaran musim pada sesuatu tahun. Analisis kandungan perut dan paras tropik menunjukkan bahawa G. cambodgiensis adalah herbivor manakala M. marginatus pula spesies opportunistik yang memakan bahan tumbuhan dan organisma akuatik kecil.a

Key words: Biology of cyprinids, Growth condition, Trophodynamic analysis, Resource partitioning

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