Field Document 09 SEAWEED (GRACILARIA) FARMING TRIALS IN SORSOGON, THE PHILIPPINES. TABLE OF CONTENTS

SEAWEED PRODUCTION DEVELOPMENT PROJECT
PHI/89/004

FAO Philippines: NEDA sa Makati Building, 106 Amorsolo Street, Legaspi Village, Makati, Metro Manila, Philippines; Tel. Nos. 850611 to 25 & 8171507; Telex No. 64111 FAO PN; Fax No. (662) 8171654

BFAR-DA: 3rd Floor, Arcadia Building, 860 Quezon Avenue, Metro Manila, Philippines; Tel. No. 973617

by

Nyan Taw
Chief Technical Adviser

This field document is one of a series of documents prepared during the course of the project identified on the title page. The conclusions and recommendations given in the document are those considered appropriate at the time of its preparation. They may be modified in the light of further knowledge gained at subsequent stages of the project.

The Project Area: Eastern Sorsogon and Sorsogon Bay

BUREAU OF FISHERIES AND AQUATIC RESOURCES
FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
UNITED NATIONS DEVELOPMENT PROGRAMME
Manila, Philippines
March 1993

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TABLE OF CONTENTS

Abstract

1. INTRODUCTION

2. STUDY AREA

2.1. PROJECT AREA IN GENERAL

2.2. SOCIO-ECONOMICS

2.3. COOPERATIVE DEVELOPMENT

2.4. QUALITY OF THE GRACILARIA SPECIES

2.5. MARKETING

3. MATERIALS AND METHODS

3.1. GRACLIARIA SPECIES

3.2. FARMING AREA

3.3. FARMING METHODS

3.3.1. Fixed bottom monoline

3.3.2. Floating raft monoline

3.3.3. Pond

4. RESULTS AND DISCUSSION

4.1. ENVIRONMENT

4.1.1. Eastern Coastla area of Sorsogon

4.1.2. Sorsogon Bay

4.2. GROWTH AND PRODUCTION

5. REFERENCES

6. ACKNOWLEDGEMENT

LIST OF TABLES

Table 1

LIST OF FIGURES

Figure 1. Eastern Sorsogon and Sorsogon Bay

Figure 2. Monoline with seed plants

Figure 3. Seed plants in bi-filiment line

Figure 4. A fixed bottom monoline plot

Figure 5. A floating monoline raft

Figure 6. East Coast of Sorsogon

Figure 7. Seasonal salinity and temperature variation of eastern coastal shelf waters (Llana, 1993)

Figure 8. Sorsogon Bay chart

Figure 9. Growth and daily growth rate of G. fastigiata during March/April 1992 at Bacagay, Gubat

Figure 10. Growth and daily growth rate of G. firma during March/April 1992 at Bacagay, Gubat

Figure 11. Growth and daily growth rate of (i) G. fastigiata and G. firma during September-December 1992 at Bacagay, Gubat; and (ii) G. cylindrica during December 1992/January 1993 at Barcelona

LIST OF PLATES

Plate I. Gracilaria species from Sorsogon area

Plate II. Farming trials of Gracilaria

Abstract

The paper is on experimental farming trials carried out in Sorsogon Bay and the eastern coastal areas of Sorsogon, the Philippines, using Gracilaria species found in the area. Four major Gracilaria species - G. firma (=G. fisheri), G. fastigiata, G. cylindrica (=G. changii) and G. tenuistipitata - were recognised and used in the trials. Fixed bottom monoline (10 × 10 meter plot), floating raft monoline (5 × 5 meter) and pond (in brackish water fish pond) farming trials at 18 localities in the area were conducted. Three environmental conditions were identified : high salinity/ clear water/ firm substrate; high salinity/ semi-clear water/ sandy-mud substrate; and low salinity/ semi-clear water/ muddy substrate. Under optimum environmental condition during early part of year, an average daily percentage growth rate for G. fastigiata, G. firma, G. cylindrica and G. tenuistipitata was observed to be 9.0%, 8.7%, 9.1% and 11.2% respectively from monoline farming trials. For G. fastigiata and G. firma, an average weight attained after 54 days of growing period with initial average individual seed plant of 35.3 grams and 51.0 grams were recorded as 505.2 grams and 1,005.8 grams respectively from fixed bottom monoline farming trials.