Sains Malaysiana 50(1)(2021): 1-7

http://dx.doi.org/10.17576/jsm-2021-5001-01

Length-Weight Relationship, Condition Factor, and Age Estimation of Commercially Important Trawl Species from Mersing Coastal Waters, Johor, Malaysia

(Hubungan Panjang Berat, Faktor Keadaan dan Penganggaran Umur Ikan Pukat Tunda Komersial Tempatan dari Muara Mersing, Johor, Malaysia)

SIMON KUMAR DAS^1,2*, TOU WEE XIANG¹, NOORASHIKIN MD NOOR¹, MOUMITA DE¹ & ABDULLAH SAMAT¹ 

¹Department of Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

²Marine Ecosystem Research Center, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 29 Disember 2018/Diterima: 30 Jun 2020

ABSTRACT

Trawl fishing contributes to majority of the total fishes’ landings, supporting the choice of using age, growth determination, and condition factors (K) as part of the monitoring method for the fishes in Malaysia waters. This research specifically examines the use of age, length-weight relationship (LWR), and K to monitor the status of the commercially important fishes in Malaysia waters. LWR, K, and age of 10 commercially important trawl species (Gerres erythrourus, Drepane punctata, Otolithes ruber, Anodontostoma chacunda, Drepane longimana, Dendrophysa russelii, Sillago parvisquamis, Cynoglossus bilineatus, Sardinella brachysoma, and Alepes kleinii) from Mersing coastal waters, Johor, Malaysia, were studied. LWR (W=aL^b) indicated positive allometric growth (b > 3) for G. erythrourus and D. punctata but negative allometric growth (b < 3) for the other species. Results indicated that the species collected were in good conditions (average K, Kn > 1) in Mersing coastal waters, Johor, Malaysia. The daily growth rings of scale counts confirmed that the ages of the 10 species were typically less than 1 year (age range: 50-170 days; mean age: 95 days). The data obtained from this study will be useful for understanding the population growth pattern, age, and well-being of commercially important trawl species, which will facilitate better management techniques of these important fishery resources.

Keywords: Age; condition factor; estuary; growth; scale; trawling

ABSTRAK

Penangkapan ikan pukat menyumbang kepada sebahagian besar pendaratan ikan serta menyokong pilihan menggunakan usia, penentuan pertumbuhan dan faktor keadaan (K) sebagai kaedah pemantauan ikan di perairan Malaysia. Penyelidikan ini fokus menggunakan usia, penentuan pertumbuhan hubungan panjang berat badan (LWR) dan K sebagai sebahagian daripada langkah untuk memantau status ikan yang penting secara komersial di perairan Malaysia. LWR, K dan umur spesies ikat pukat tunda  komersial yang penting (Gerres erythrourus, Drepane punctata, Otolithes ruber, Anodontostoma chacunda, Drepane longimana, Dendrophysa russelii, Sillago parvisquamis, Cynoglossus bilineatus, Sardinella brachysoma dan Alepes kleinii) dari perairan pantai Mersing, Johor, Malaysia telah dikaji. LWR menunjukkan pertumbuhan alometrik positif (b > 3) bagi G. erythrourus dan D. punctata manakala pertumbuhan alometrik negatif (b < 3) bagi spesies lain. Nilai K yang lebih tinggi daripada satu menunjukkan ikan berada dalam keadaan baik. Annulus pada sisik mengesahkan bahawa umur untuk sepuluh spesies ini adalah kurang daripada satu tahun (lingkungan umur: 50 - 170 hari; purata umur: 95 hari). Keputusan yang diperoleh akan menjadi berguna untuk memahami pertumbuhan, umur dan kesihatan spesies ikat pukat tunda yang akan memudahkan teknik pengurusan yang lebih baik.

Kata kunci: Faktor keadaan; muara; pertumbuhan; pukat tunda; sisik ikan; umur

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*Pengarang untuk surat-menyurat; email: simon@ukm.edu.my