Sains Malaysiana 46(4)(2017):
545–551
http://dx.doi.org/10.17576/jsm-2017-4604-05
Condition Index of Meretrix
lyrata (Sowerby 1851) and Its Relationship with Water Parameter
in Sarawak
(Indeks Keadaan Meretrix
lyrata (Sowerby 1851) dan Hubungannya dengan Paramater Air
di Sarawak)
HADI
HAMLI*,
MOHD
HANAFI
IDRIS,
AMY
HALIMAH
RAJAEE,
ABU
HENA
MUSTAFA
KAMAL
& MOHAMMAD NESARUL HOQUE
Department of Animal Science and Fishery, Faculty of Agriculture
and Food Sciences, Universiti Putra Malaysia Bintulu Sarawak Campus,
Nyabau Road, P.O. Box 396, 97008 Bintulu, Sarawak Bumi Kenyalang,
Malaysia
Diserahkan: 28 Ogos 2014/Diterima: 10 September 2016
ABSTRACT
Condition Index (CI)
was used to estimate the reproductive biology cycle of the hard
clam Meretrix lyrata based on dry body weight and shell weight. High
CI
value was observed due to the increase in the body
weight of the hard clam that corresponding to the maturity stage
and early spawning. The CI value of M. lyrata from Buntal
Village, Kuching, Sarawak showed three highest peaks during the
12-month study on May and October 2013 and March 2014. The lowest
CI values were obtained in September and November 2013 and
April 2014. Ammonia nitrogen was the only water parameter that significantly
correlated to the CI values. The CI application
is important to estimate the maturity of hard clam gonad to facilitate
conservation activity through the hard clam harvesting out of the
gonad maturation and spawning period.
Keywords: Ammonia; condition
Index; gonad maturation; Meretrix
lyrata; Sarawak
ABSTRAK
Indeks keadaan (CI)
digunakan untuk menganggar kitaran biologi pembiakan kekima Meretrix lyrata berdasarkan berat badan dan berat cengkerang.
Nilai CI yang tinggi adalah disebabkan oleh peningkatan berat
badan kekima keras yang sepadan terhadap biologi pembiakan pada
peringkat matang dan permulaan bertelur. Nilai CI M. lyrata dari Kampung
Buntal, Kuching, Sarawak mempunyai tiga puncak tertinggi dalam tempoh
12 bulan kajian, iaitu pada Mei dan Oktober 2013 serta Mac 2014.
Nilai CI
terendah diperhatikan pada September dan November
2013 serta April 2014. Hanya parameter air nitrogen ammonia didapati
berkait secara ketara dengan nilai CI.
Aplikasi CI adalah penting untuk menganggar kematangan gonad kekima
keras bagi memudahkan aktiviti pemeliharaan melalui penuaian kekima
keras selain daripada masa kematangan gonad dan bertelur.
Kata kunci: Ammonia; indeks keadaan; kematangan gonad; Meretrix
lyrata; Sarawak
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*Pengarang untuk surt-menyurat;
email: hadihamli@gmail.com
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