RESTRICTED
FI : DP/HUN/71/512/7
May 1979

THE HUNGARIAN PEOPLE'S REPUBLIC
EVALUATION OF THE WATER RECYCLING FISH REARING PLANT AT THE FISH CULTURE RESEARCH INSTITUTE SZARVAS, HUNGARY

TABLE OF CONTENTS


A report prepared for the
Development of Fish Culture Research Project


by


B.D. Combs
Consultant


This is one of a series of reports prepared during the course of the UNDP project identified on the title page. The conclusions and recommendations given in the report 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 designations employed and the presentation of the material in this document do not imply the expression of any opinion whatsoever on the part of the United Nations or the Food and Agriculture Organization of the United Nations concerning the legal or constitutional status of any country, territory or sea area, or concerning the delimitation of frontiers.

FAO. Development of a Fish Culture Research Project, The Hungarian People's Republic. Evaluation of the Water Recycling Fish Rearing Plant at the Fish Culture Research Project, based on the work of B.D. Combs. Rome, 1979. 7 p., 1 fig. FI:DP/HUN/71/512/7
 
ABSTRACT
 
The objectives of this consultancy, carried out from 1–29 December 1978 at the Fish Culture Research Institute, were to evaluate the operation of the water recycling fish rearing plant and to elaborate methods for improvement if required.
The Consultant found physical features of the system excellent and biochemical parameters within acceptable limits.
Two changes in the structure were recommended: enlarging waste drains to permit more rapid draining of fish tanks to the waste canal and additional filter media to facilitate backflushing.
Procedures for sanitizing the entire recycling system were recommended.
A proposal for monitoring several important water quality parameters was elaborated.
Research projects, under the general headings of nutrition and physiology were suggested. Basic information is needed in these fields as intensive rearing becomes more important.
The production of high-value fish such as European catfish, Silurus glanis, and eel, Anguilla anguilla, in rearing space not needed for experiments was recommended.
The importance of good fish hygiene in the recycling system was emphasized. Four methods of minimizing the chance of disease were proposed. These recommendations in order of importance were:

  1. All stages of fish rearing, i.e., egg incubation, fry and fingerling rearing be carried out in disease-free water.

  2. Quarantine of fish destined for the recycle system until it is reasonably assured that they are disease-free.

  3. Continuous disinfection of the circulating water with ultraviolet radiation or ozone treatment.

  4. Periodic sterilization of the entire system with chlorine.

FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
Rome, 1979

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TABLE OF CONTENTS

1. INTRODUCTION

1.1 Terms of Reference

1.2 Background Information

2. EVALUATION OF THE WATER RECYCLING FISH REARING PLANT

2.1 Physical Features

2.2 Biochemical Parameters

3. CONCLUSIONS AND RECOMMENDATIONS

3.1 Waste Drains

3.2 Biofilter Backflushing

3.3 Sterilization of the Entire Recycle System

3.4 Water Quality Monitoring

3.5 Research Programme

3.6 Production

3.7 Fish Hygiene

REFERENCE

Figure 1. Schematic diagram of the water recycling fish rearing plant at FCRI, Szarvas