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Natural Diet of Blue Swimming Crab, Portunus pelagicusat
Strait of Tebrau, Johor, Malaysia
(Diet Semula Jadi Ketam Renjong, Portunus pelagicus di
Selat Tebrau, Johor, Malaysia)
M. IKHWANUDDIN1*, A.N.
LIYANA2, M.N.
AZRA1, Z.
BACHOK3 & A.B.
ABOL-MUNAFI4
1Institute of Tropical Aquaculture, Universiti
Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia
4School of Fisheries and Aquaculture Sciences, Universiti Malaysia
Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia Diserahkan: 14 November 2012/Diterima: 14 Mac 2013
ABSTRACT
Knowledge of natural diet in Portunus pelagicus is essential to understand its nutritional
requirements, its interactions with other organisms and its potential for
culture. The natural diet of P.
pelagicus was studied in Strait of Tebrau, Johor, Malaysia via gut content
analysis and molecular analysis. A total of 30 identifiable fatty acids were
detected in foregut content of P. pelagicus. Fatty acid 18:3ω3 act
as a mangrove detritus marker was found to be the most abundant in foregut
content of both sexes of P. pelagicus and has higher value in female. PUFA was
the main fatty acid found in foregut content of P. pelagicus and major
contributed by fatty acid 18:3ω3, 20:5ω3 and 22:6ω3. Marine
animal’s marker was found to be the dominant in foregut content of P.
pelagicus and that indicated that marine animals were the main food source
of P. pelagicus. In conclusion, this study showed that P. pelagicus is
a primarily omnivores crab with preference of marine animal and with addition
and/or incidental fed plant items.
Keywords: Dietary composition; fatty acid analysis; foregut
contents; Portunus pelagicus
ABSTRAK
Pengetahuan mengenai makanan semula jadi ketam renjong, Portunus pelagicus adalah perlu dalam kajian
keperluan nutrisinya, kaitannya dengan organisma lain dan potensi
untuk menternaknya. Kajian makanan semula jadi P. pelagicus
di Selat Tebrau, Johor, Malaysia dijalankan melalui kandungan
analisis perut dan molekulnya. Sejumlah 30 asid lemak telah dikesan
di dalam perut P. pelagicus. Asid lemak jenis 18:3ω3
yang bertindak sebagai penanda sisa bakau telah dikesan sebagai
yang terbanyak di dalam perut jantan dan betina P. pelagicus
dan mempunyai nilai yang lebih tinggi dalam ketam betina. PUFA dikenal pasti sebagai
asid lemak yang utama di dalam perut P. pelagicus dan penyumbang
terbanyak asid lemak ialah 18:3ω3, 20:5ω3 dan 22:6ω3.
Penunjuk haiwan marin adalah yang paling banyak dikenal pasti di
dalam perut P. pelagicus dan ini menunjukkan ia adalah makanan
utama P. pelagicus. Kesimpulannya, kajian menunjukkan bahawa
P. pelagicus adalah ketam omnivor dengan makanan utamanya
adalah haiwan marin dan makanan tambahannya dengan/atau bahan-bahan
daripada tumbuhan.
Kata kunci: Analisis asid
lemak; kandungan perut; komposisi pemakanan; Portunus
pelagicus
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*Corresponding author; email: ikhwanuddin@umt.edu.my
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