FANG Zhe, LIU Min, LIANG Lei, HUANG Huiqin, ZHU Jun, BAO Shixiang. The Effect of Seawater Relative Density on the Growth and the Carrageenan and Pigment Content of the Agar Eucheuma （Betaphycus gelatinum）[J]. Journal of Tropical Biology, 2012, 3(3): 204-207. doi: 10.15886/j.cnki.rdswxb.2012.03.018
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FANG Zhe, LIU Min, LIANG Lei, HUANG Huiqin, ZHU Jun, BAO Shixiang. The Effect of Seawater Relative Density on the Growth and the Carrageenan and Pigment Content of the Agar Eucheuma （Betaphycus gelatinum）[J]. Journal of Tropical Biology, 2012, 3(3): 204-207. doi: 10.15886/j.cnki.rdswxb.2012.03.018
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The Effect of Seawater Relative Density on the Growth and the Carrageenan and Pigment Content of the Agar Eucheuma （Betaphycus gelatinum）
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Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
- Received Date: 2012-06-04
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Abstract
Agar Eucheuma （Betaphycus gelatinum）, rich in carrageenan, polysaccharide and various pigments, is an important economic tropical alga. However, production of Eucheuma, both wild and farmed, has become less and less due to the influence of deterioration of seawater environment. Eucheuma growing in different relative densities of seawater were observed and determined in growth rate and content of carrageenan and pigment. Results show that Eucheuma survived at a seawater relative density range of 1.014 to 1.030 and grew well at the relative density from 1.018 to 1.024. Eucheuma grew at a daily rate of upto 4.6% at the relative density of seawater of 1.022, contained 64.2% of carrageenan （the highest among all the treatments） at the seawater relative density of 1.024, and had maximum contents of chlorophyll a, PC, PE and APC at the respective seawater relative densities of 1.026, 1.024,1.022 and 1.020. These results give us more insight into the growth characteristics of Eucheuma to revitalize farming and development of Eucheuma in the future.
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