Kesan Persekitaran Dan Nutrien Terhadap Kadar Pertumbuhan, Kandungan Klorofil A, Berat Kering Dan Kandungan Agar Rumpai Laut Merah Gracilaria Manilaensis (Rhodophyta, Gracilariaceae)

摘要

Kajian dijalankan untuk mengkaji kesan keamatan cahaya, pergerakan air,udkedalaman air, berat awal kultur dan kandungan nutrien (NH4+, NO3- dan PO42-)udterhadap pertumbuhan, kandungan klorofil a, berat kering dan kandungan agar padaudrumpai laut merah Gracilaria manilaensis. Kajian telah dijalankan di kolam udangudterbiar di Merbok, Kedah dan juga di makmal Universiti Sains Malaysia (USM) dariudJun 2008 hingga Jun 2010. Keputusan kajian pengkulturan dengan berat awal kulturudyang sedikit menghasilkan Kadar Pertumbuhan Relatif (KPR) yang lebih tinggiud(200g>500g>1,000g). Terdapat perbezaan kandungan klorofil a antara berat awaludkultur 200g dengan 500g dan 1,000g (200g>500g=1,000g). Berat kering bagi beratudawal kultur 500g dan 200g adalah lebih tinggi (500g=200g>1,000g) namun tiadaudperbezaan yang signifikan terhadap kandungan agar (P>0.05).ududA study was carried out to determine the effect of light intensity, waterudmovement, water depth, initial stocking density and nutrient content (NH4+, NO3- andudPO42-) on the growth, chlorophyll a concentration, dry weight and agar yield of theudred macroalgae Gracilaria manilaensis. The study was conducted in an abandonedudshrimp pond in Merbok, Kedah and in the laboratory of Universiti Sains Malaysiaud(USM) from June 2008 until June 2010. Results showed that the culture with lowudinitial weight produced higher Relative Growth Rate (RGR) (200g>500g>1,000g).udChlorophyll a content showed a significant difference between 200g cultureudcompared to 500 and 1,000g (200g>500g=1,000g). Dry weight for 500g and 200gudculture were significantly high (500g=200g>1,000g) but both showed no significantuddifferences for the agar yield (P>0.05).ud