FISHPEN AND CAGE CULTURE DEVELOPMENT PROJECT IN LAGUNA DE BAY REPUBLIC OF THE PHILIPPINES TABLE OF CONTENTS

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REPUBLIC OF THE PHILIPPINES

Fishpen and Cage Culture Development Project
in Laguna de Bay, Philippines

A report to the

Field Level Workshops for the Fishpen/Cage
Development in Laguna de Bay

TCP/PHI/0003(T)

by

Catalino R. Dela Cruz
Senior Aquaculture Officer (Team Leader)

Project Document Identification

III. Work Plan 4(a)(ii), (b)(iii), (c)(ii) & (iv)

4. Aquaculture The objective will be to establish a programme of action for aquaculture development through the improvement of cultural practices in existing areas in particular countries, and the development of new areas.

1. Determination of the particular systems most likely to be profitable in each country.

   2. Examine legal and institutional machinery related to aquaculture, in particular the aspects which hinder development of aquaculture.

2. Determination of extent and nature of areas suitable for future expansion of aquaculture.

   2. Describe ecological characteristics of the areas where expansion seems possible, e.g., vegetation, salinity, water quality, water currents, etc.

   3. Describe existing or potential competition for use of potential areas (pollution, competition from housing and industries, other demands).

3. Examination of factors affecting productivity and profitability of existing and future aquaculture operations.

   2. Examine cost and benefits of different sizes of farms, with special reference to supplies and uses of materials and labour.

   4. Examine markets and marketing practices.

FISHPEN AND CAGE CULTURE DEVELOPMENT
PROJECT IN LAGUNA DE BAY, PHILIPPINES

by

CATALINO R. DELA CRUZ¹

ABSTRACT

This report covers the aquaculture sub-component aspect of the Project TCP/PHI/0003(5) which is an FAO/TCP technical assistance to LLDA in order to further strengthen its capacity to implement effectively the bank-financed Laguna de Bay Fishpen Development Project (LBFDP).

Review of existing information and field level workshops were conducted. Among other things, the technologies on milkfish pen culture and tilapia cage culture were discussed with the fishermen during the workshops. The pen and cage culture systems as gathered from technical publications, personal interviews from the LLDA consultants and fishermen themselves are discussed thoroughly in this report. It also includes a proposed pure cage culture of tilapia along with other recommendations to LLDA.

¹ Senior Aquaculture Officer (Team Leader), Fishpen and Cage Culture Development Project in Laguna de Bay, Philippines TCP/PHI/0003(T). Present address: Freshwater Aquaculture Centre Central Luzon State University Munoz, Nueva Ecija

SOUTH CHINA SEA FISHERIES DEVELOPMENT AND COORDINATING PROGRAMME
Manila, Philippines
June 1982

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TABLE OF CONTENTS

ABSTRACT

1. INTRODUCTION

1.1 Project Background (LBFDP)

1.2 Background of the TCP/PHI/0003 (T)

2. METHODOLOGY

3. RESULTS AND DISCUSSIONS

3.1 Fishpen Designs and Culture Practices

3.1.1 Fishpen design

3.1.1.1 Site selection

3.1.1.2 Size and shape

3.1.1.3 Structural framework, construction materials and specifications

3.1.1.4 Time and sequence of construction

3.1.1.5 Some required skills in construction

3.1.2 Pen culture practices

3.1.2.1 Species cultured

3.1.2.2 Source and transport of fingerlings

3.1.2.3 Culture/Management practices

3.1.3 Problems in fishpen operation

3.2 Cage Designs and Culture Practices

3.2.1 Cage designs

3.2.1.1 Size of cages

3.2.1.2 Materials of construction

3.2.2 Cultural practices

3.2.2.1 Species

3.2.2.2 Tilapia seed production

3.2.2.3 Stocking density and production

3.2.2.4 Harvesting and marketing

3.2.3 Problems on cage culture

3.3 Fishpen and Cage Culture System for the LBFDP as Proposed by the BRI Consultants

3.4 Production and Profitability of Fishpen and Cages

4. RECOMMENDATIONS

5. SUMMARY

6. REFERENCES

APPENDICES

1. Pagggawa ng “Fishpen” (Fishpen Construction)

2. Pamamaraan sa Pag-aalaga ng Bangus sa “Fishpen” (Pen Culture of Milkfish)

3. Pag-aalaga ng Tilapia sa “Cage” (Kulungan) (Cage Culture of Tilapia)

LIST OF TABLES

Table 1. Combined profitability of fishpen and cage culture

2. Profitability of pure cage culture of Tilapia nilotica (no supplemental feeding)

3. Annual production and sale per size of module

4. Income statement per module size

5. Basic assumptions for pure cage culture of tilapia nilotica

6. Gross income, expenses and net income (no feed supplement)

7. Gross income, expenses and net income (with feed supplement)

8. Capital investments in pure cage culture

9. Tilapia production in pure cage culture

10. Amount and use of loan in pure cage culture

11. Loan amortization schedule (without feeds)

12. Loan amortization schedule (with feeds)

LIST OF FIGURES

Figure 1. Cluster arrangement of pens and cages with common barrier

2. Isometric view of common barrier and net enclosure

3. Side view of common barrier and net enclosure

4. Plan view and section A-A of fish cage

5. Connection between the barrier and pen enclosure