Field Document 90/4

	HATCHERY PRODUCTION OF TROCHUS (Trochus niloticus) IN VANUATU: A REVIEW OF THE EXISTING FACILITIES AND A MANUAL OF REARING TECHNIQUES APPROPRIATE FOR A SMALL-SCALE HATCHERY
	CONTENTS

WARWICK J. NASH

Department of Sea Fisheries,
Crayfish Point, Taroona, Tasmania 7053,
Australia

February 1989

The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations concerning the legal or constitutional status of any country, territory, city or area or of its authorities, or concerning the delimitations of its frontiers or boundaries.

SOUTH PACIFIC AQUACULTURE DEVELOPMENT PROJECT
FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
GCP/RAS/116/JPN
Suva, Fiji

Hyperlinks to non-FAO Internet sites do not imply any official endorsement of or responsibility for the opinions, ideas, data or products presented at these locations, or guarantee the validity of the information provided. The sole purpose of links to non-FAO sites is to indicate further information available on related topics.

This electronic document has been scanned using optical character recognition (OCR) software. FAO declines all responsibility for any discrepancies that may exist between the present document and its original printed version.

CONTENTS

Executive statement

Terms of reference

Summary

Recommendations

1   Introduction

2   Nomenclature used

3   Prospects of success of a trochus hatchery: general considerations

4   Review of the proposed hatchery facility

4.1   Equipment

4.2   Adequacy of the facility

4.3   Water quality

4.4   Pumps

4.5   Tanks

4.6   Plumbing

4.7   Air blower

4.8   Personnel

5   Suggested hatchery layout and design

5.1   Trochus culture components

5.1.1   Spawning tanks

5.1.2   Hatchery tanks

5.1.3   Nursery phase no. 1

5.1.4   Nursery phase no. 2

5.1.5   Pumps and air blower

5.1.6   Laboratory

6   Discussion

6.1   Site suitability

6.2   Training of hatchery personnel

6.3   Trochus ranching and management of the wild fishery

6.4   Suitability of trochus mariculture and ranching to the Vanuatu social system

7   Conclusion

8   Acknowledgements

9   References

Appendix I:   Manual of trochus rearing techniques

I.1   Spawning

I.2   Collecting the eggs

I.3   Hatchery phase

I.4   The nursery phases

I.4.1   Nursery phase no. 1

I.4.2   Nursery phase no. 2

I.5   Ocean nursery phase

I.6   Ranching phase

I.7   Choosing which options to adopt

Appendix II:   “Hatchery rearing of trochus as a management tool” - extracted from Australian Fisheries 47(11): 36–39

Appendix III:   An experiment to determine the factor(s) causing death of adult trochus in the aquarium system at Port Vila

Appendix IV:   Programme itinerary

Appendix V:   List of people, Government departments and private institutions with whom the concept of a trochus hatchery in Vanuatu was discussed