Seaweeds of Panay
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2006Page views
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Abstract
This practical book on the seaweeds of Panay, Philippines, acquaints and provides information to members of the academe and research institutions, policy makers, fishermen and businessmen regarding the taxonomy, distribution, ecology and economic importance of these resources. It consists of 4 major parts: (1) Introduction, which reviews the literature, habitat, distribution, morphological structure and reproduction; 2) Classification, which describes the classes to which the seaweeds generally belong; 3) Collection and preservation, which explains the procedure used in treatment of specimens; and, 4) Taxonomic list. A glossary is included, covering technical terms used. All species listed and described in this book are macrobenthic and were collected in Panay and Guimaras Islands.
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1st Ed.Suggested Citation
Hurtado, A. Q., Luhan, M. R. J., & Guanzon Jr., N. G. (2006). Seaweeds of Panay. (2nd ed.). Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center.
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9789718511787Format
x, 50 p. : ill.
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Evaluation of agar from three species of Gracilaria from Panay and Guimaras islands
(San Carlos Publications, University of San Carlos, 1993)Agar from three species of Gracilaria, G. changii G. coronopifolia, and Gracilariopsis heteroclada, collected form Panay and Guimaras islands was evaluated. Each species was pretreated with NaOH solution before extraction. Highest agar yields were obtained following alkaline pretreatment at the lowest concentration (1% NaOH) for all species. Highest gel strengths were obtained at different alkaline pretreatment conditions: 644 ± 3.4 g cm-2 at 3 % NaOH for 60 min for G. changii, 641 ± 11.9 g cm-2 at 5 % NaOH for 30 min for G. heteroclada, and 170 g cm-2 at 5 % NaOH for 30 min G. coronopifolia. Agar gelling temperatures ranged from 38.5-40ºC and agar melting temperature ranged from 80.5-85 ºC. Specific viscosity was highest for agar from G. changii at 18 cps. Moisture and ash contents ranged from 8.04-15.20 % and 4.32-4.98%, respectively. Based on the result for this study, G. heteroclada and G. changii are two species which merit further studies for their prospective commercial value to the different industries using agar. -
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(Elsevier, 1992)Interviews were conducted among eight Gracilaria growers in Panay, Western Visayas, Philippines from March to July (1990) using a structured questionnaire. The "rice planting" method was employed by farmers growing seaweeds in natural drainage canals and ponds. Initial harvests are made 15–60 days after planting. Higher production [ 7–14 t (dry) ha−1 year−1] are obtained from cultures in canals than in ponds [3–4 t (dry) ha−1 year−1]. The net income derived from culture in ponds is estimated at P698/crop or P6313/year (US$234/year). A higher net income of P4936/crop or P41766/year (US$1547/year) was generated from Gracilaria farming in canals. Returns on investment (ROI) from farming in ponds and canals are 39% and 908%, respectively. Payback period is 2 months in canal farming and 1.8 years in pond farming. -
Agar from Gracilariopsis heteroclada from Panay Island, Philippines
(Philippine Council for Aquatic and Marine Research and Development, 1994)This paper aims to determine the optimum NaOH pretreatment strength and duration and also the monthly variations in gel strength, agar yield and sulfate content of agar from Gracilariopsis heteroclada (Zhang et Xia) Zhang et Xia. Samples collected from Leganes, Iloilo, Philippines were pretreated with NaOH at different strengths (1,3 and 5%) and duration (30 min and 60 min) at 85-90°C. Agar extractions were done by the method of Nelson et al. (1983) Agar yield was calculated based on Santos (1980). Gel strength and sulfate content were determined using the methods of Aguilar-Santos and Doty (1978) and Jackson and McCandless (1978), respectively. Agar gelling and melting temperatures were analyzed in triplicate (Whyte and Englar, 1976). Viscosity in cps, moisture and ash contents in per percent, were determined using standard methods. Analysis of variance and Duncan’s multiple range test were used to compare the gel strength for the NaOH pretreatment experiment and the different monthly samples. Correlation analysis was carried out to determine the relationship between the different parameters analyzed. Highest gel strength (641 gm cm-2 ) and lowest sulfate content (7.66 gm/mg SO4) were obtained following alkaline pre-treatment with 5% NaOH for 30 min with agar yield of 32.4 per cent. Gelling and melting temperatures of agar with the highest gel strength were 40°C and 80°C, respectively, while specific viscosity, moisture and ash contents were 7.5 cps, 12.2% and 4.32%, respectively. Agar yield was negatively correlated with NaOH pre-treatment (P<0.05). Sulfate content was negatively correlated with gel strength (P<0.05). Gel strength, agar yield and sulfate content showed monthly variation. Sulfate was highly correlated with gel strength (P<0.05). Agar yield was positively correlated with month, while it is negatively correlated with gel strength (P<0.05). The results showed that agar from Gracilariopsis heteroclada has a very good potential for use as raw material for the production of food, drug and industrial grades of agar because of its superior gel strength.
