Abstract
Biomass, cover and agar quality of three species of Gracilaria were monitored monthly in three sites in Negros Oriental, central Philippines, during the period July 1992–June 1993. The biomass per unit area of G. arcuata peaked around March while G. salicornia was maximal around November. Seasonality in G. blodgettii is not obvious from our data as this is a highly harvested species and we may have sampled after gleaners have harvested the algae.
Agar yield values were for G. arcuata from Bais, 2.9 ± 7% to 21.7 ± 0.7% while the same species from Siaton yielded 2.6 ± 0.6% to 18.3 ± 0.5%; G. salicornia yielded 2.9 ± 0.1% to 15.7 ± 1.3% and G. blodgettii, 0.1% to 20.7 ± 5.9%. Gel strength and viscosity were variable. Gel strength values were: G. arcuata (Bais), 17–260 g cm−2; G. arcuata (Siaton), 58–270 g cm−2; G. salicornia, 29.5–147 g cm−2; G. blodgettii, 29.6–235 g cm−2, and related to the 3,6-anhydrogalactose and sulphate content of the algae.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Chirapart, A. & M. Ohno, 1993. Seasonal variation in the physical properties of agar and biomass of Gracilaria sp. (chorda type) from Tosa Bay, southern Japan. Hydrobiologia 260–262: 541–547.
Craigie, J. S. & C. Leigh, 1978. Carrageenans and agars. In Hel-lebust, J.A. & J.S. Craigie (eds), Handbook of Phycological Methods, Physiological and Biochemical Methods. Cambridge University Press, Cambridge: 109–131.
Golterman, H. L., R. S. Clymo & M. A. M. Ohnstad, 1978. Methods for Physical and Chemical Analysis of Fresh Waters. IBP Handbook No. 8. Blackwell Scientific Publications, Oxford, Edinburgh, London, Melbourne, 82 pp.
Grasshoff, K., 1983. Determination of nitrate. In Grasshoff, K., M. Ehrhardt & K. Kremling (eds), Methods of Seawater Analysis, Second, Revised and Extended Edition, Verlag Chemie GmbH, D-6940, Weinheim: 143–150.
Hurtado-Ponce, A. & I. Umezaki, 1988. Physical properties of agar gel from Gracilaria (Rhodophyta) of the Philippines. Bot. mar. 31: 171–174.
Jackson, S. G. & E. L. McCandles, 1978. Simple, rapid tur-bidimetric determination of inorganic sulfate/or protein. Anal. Biochem. 90: 802–808.
Koroleff, F., 1983. 9.1. Determination of phosphorus. In Grasshoff, K., M. Ehrhardt & K. Kremling (eds), Methods of Seawater Analysis, Second, Revised and Extended Edition, Verlag Chemie GmbH, D-6940, Weinheim: 125–138.
Lahaye, M. & C. Rochas, 1991. Chemical structure and physico-properties of agar. Hydrobiologia 221: 137–148.
Macler, B. A. & J. A. West, 1987. Life history and physiology of the red alga, Gelidium coulteri, in unialgal culture. Aquaculture 61: 281–293.
Mouradi-Givernaud, A., T. Givernaud, H. Morvan & J. Cos-son, 1992. Agar from Gelidium latifolium (Rhodophyceae, Gelidiales): biochemical composition and seasonal variations. Bot. mar. 35: 153–159.
Rees, D. A., 1969. Structural conformation and mechanism in the formation of polysaccharide gels and networks. Adv. Carbohydr. Chem. Biochem. 24: 267–332.
Sousa-Pinto, I., R. Lewis & M. Polne-Fuller, 1996. The effect of phosphate concentration on growth and agar content of Gelidium robustum (Gelidiaceae, Rhodophyta) in culture. Hydrobiologia 326/327: 437–443.
Trono, Jr. G. C. & R. Azanza-Corrales, 1981. The seasonal variation in the biomass and reproductive states of Gracilaria in Manila Bay. Proc. int. Seaweed Symp. 10: 743–748.
Whyte, J. N. C. & J. R. Englar, 1980. Chemical composition and quality of agar in the morphotypes of Gracilaria from British Columbia. Bot. mar. 23: 277–283.
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 1999 Springer Science+Business Media Dordrecht
About this paper
Cite this paper
Calumpong, H.P., Maypa, A., Magbanua, M., Suarez, P. (1999). Biomass and agar assessment of three species of Gracilaria from Negros Island, central Philippines. In: Kain, J.M., Brown, M.T., Lahaye, M. (eds) Sixteenth International Seaweed Symposium. Developments in Hydrobiology, vol 137. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4449-0_20
Download citation
DOI: https://doi.org/10.1007/978-94-011-4449-0_20
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-5909-1
Online ISBN: 978-94-011-4449-0
eBook Packages: Springer Book Archive