Sains Malaysiaana 38(2): 159-169(2009)

Population Structure, Growth and Length Weight Relationship of Sergestid Shrimps (Acetes spp.) from the Coastal Waters of Malacca, Peninsular Malaysia

(Struktur Populasi, Pertumbuhan dan Hubungan Panjang-Berat Udang Sergestid

(Acetes spp.) di Perairan Selat Melaka, Semenanjung Malaysia)

Aziz Arshad, Siti Shapor Siraj & Japar Sidik Bujang

Department of Biology, Faculty of Science, Universiti Putra Malaysia,

43400 UPM Serdang, Selangor , Malaysia

S.M. Nurul Amin

Institute of Marine Sciences and Fisheries,

University of Chittagong , Chittagong-4331, Bangladesh

Received:  13June 2008 / Accepted:  7 August 2008

ABSTRACT

The size frequency distribution for age structure and length weight relationship of three species of the genus Acetes from the coastal waters of Malacca, Peninsular Malaysia are reported. The length frequency distribution for A. indicus suggested that the population consisted of two dominant age groups with mean at 20.80 (± 2.42) mm and 29.85 (± 2.79) mm of total length, respectively.  The population of A. japonicus consisted of maximum two age groups, with means of 15.18 (± 0.90) mm and 21.56 (± 1.03) mm of total length. The population of A. intermedius also consisted of maximum two age groups, with means of 19.18 (± 2.45) mm and 26.92 (± 2.82) mm of total length. The positive allometric nature of growth for A. indicus was observed in the coastal waters of Malacca. But isometric nature of growth was found in combined sexes of A. japonicus. The positive allometric nature of growth was observed in female and both sexes of A. intermedius. There were significant difference between males and females size-frequency distribution of A. indicus (Kolmogorov-Smirnov test: d_max= 0.42, P < 0.001), A. japonicus (Kolmogorov-Smirnov test: d_max = 0.39, P < 0.001) and A. intermedius (Kolmogorov-Smirnov test: d_max = 0.40, P < 0.001).  The significant differences were observed between mean total length of female and male of A. indicus, A. japonicus and A. intermedius (t-test, P < 0.001).

Keywords: Acetes spp; population structure; peninsular Malaysia

ABSTRAK

Taburan frekuensi bagi struktur umur dan hubungan panjang berat bagi tiga spesies genus Acetes dari perairan pantai Melaka, Semenanjung Malaysia dilaporkan. Taburan frekuensi panjang Acetes indicus menunjukkan yang populasinya terdiri daripada dua kumpulan umur dominan dengan nilai purata 20.80 (± 2.42) mm dan 29.85 (± 2.79) mm setiap satu daripada jumlah keseluruhan panjang badan.  Populasi A. japonicus pula terdiri daripada dua kumpulan umur maksimum, dengan nilai purata 15.18 (± 0.90) mm dan 21.56 (± 1.03) mm daripada jumlah keseluruhan panjang.  Populasi A. intermedius juga didapati terdiri daripada dua kumpulan umur maksimum, dengan nilai purata  19.18 (± 2.45) mm dan 26.92 (± 2.87) mm daripada jumlah keseluruhan panjang badan.  Kajian menunjukkan yang populasi A. indicus daripada perairan Pantai Melaka diperhatikan mempunyai pertumbuhan semulajadi alometrik yang positif manakala pertumbuhan semulajadi isometrik didapati pada kedua-dua jantina A. japonicus.  Pertumbuhan semulajadi alometrik positif diperhatikan pada yang betina dan juga kedua-dua jantina A. intermedius. Terdapat perbezaan bererti  pada taburan frekuensi saiz antara jantan dan betina A. indicus  (ujian Kolmogorov-Smirnov: d_max= 0.42, P < 0.001), A. japonicus (ujian Kolmogorov-Smirnov: d_max = 0.39, P < 0.001) dan A. intermedius (ujian Kolmogorov-Smirnov: d_max = 0.40, P < 0.001).  Perbezaan bererti didapati pada jumlah purata panjang keseluruhan betina dan jantan A. indicus, A. japonicus dan A. intermedius  (t-test, P < 0.001).

Kata kunci:  Acetes spp.; struktur populasi;  Semenanjung Malaysia

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