COCKLE CULTURE CONTENTS

Project Document Identification

PART II F. Activities

Prepare seafarming manuals and other technical/information serials

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CONTENTS

1. INTRODUCTION

2. POTENTIAL AREA

3. SITE SELECTION

3.1 Sheltered area
3.2 Substrate
3.3 Water depth
3.4 Land elevation
3.5 Water movement
3.6 Salinity

4. CULTURE TECHNIQUES

4.1 Preparation of culture site
4.2 Source of seed
4.3 Stocking density
4.4 Sowing of cockle spat
4.5 Culture period
4.6 Growth
4.7 Mortality and predation
4.8 Pollution
4.9 Management
4.10 Production
4.11 Case study : cockle culture trial in Tg. Balai Asahan, Medan

5. ECONOMIC CONSIDERATIONS

5.1 Small-scale operation
5.2 Commercial operation
5.3 Sensitivity analysis

6. MARKETING

7. LITERATURES CITED

LIST OF TABLES

Table 1. Volume and value of cockle production from 1979–1985

Table 2. Cockle production by location 1981–1985 (mt)

Table 3. Estimated capital investment of a 5-ha cockle farm.

Table 4. Estimated annual cost of production of a 5-ha cockle farm.

Table 5. Cost-benefit analysis of a 5-ha cockle farm

Table 6. Cash flow of a 5-ha cockle farm.

Table 7. Estimated capital investment of a 50-ha cockle farm.

Table 8. Estimated annual cost of production of a 50-ha cockle farm

Table 9. Cost-benefit analysis of a 50-ha cockle farm.

Table 10. Cash flow of a 50-ha cockle farm

Table 11. Percentage of net profit changes when the sale price of the cockle and the price of seed increase or decrease 10 per cent

Table 12. Financial analysis

LIST OF FIGURES

Figure 1. Cockle (Anadara granosa L).

Figure 2. Diagrammatic representation of the wire collecting basket to collect spat of Anadar granosa.

Figure 3. Diagram of the wooden “mud sled”

Figure 4. The gear used for harvesting cockle

Figure 5. Hydraulic dredge for harvesting cockle

Figure 6. Hydraulic dredge-showing the delivery of the cockle to the collecting screen

Figure 7. Growth in mean wet weight of different subpopulations within a natural population of A. granosa at Kuala Selangor, Maaysia

Figure 8. Predators of cockle