טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentSimon Yitzhak
SubjectCharacterization of the Operational Model and Optimal
Management of a Recirculation Aquaculture System
(RAS)
DepartmentDepartment of Agricultural Engineering
Supervisors Professor Emeritus Dan Zaslavsky (Deceased)
Dr. Ilan Halachmi
Dr. Rami Guetta


Abstract

With progress in use of water, the central problem of proper and efficient utilization of high quality water resources has emerged. Since aquaculture has always been a high demanding branch of agriculture, it was only a matter of time before constraints resulting from reduction of water resources were defined, and these have led to the development of recycled, closed aquaculture systems, RAS (Recycled Aquaculture Systems).

A 'negative' common denominator of most RAS is the failure to meet annual production targets. After 15 years of experience in operating RAS in Israel and elsewhere in the world, annual production reaches only about 70% of the targets set, as shown in data collected from 7 Israeli and U.S. farms (tons/year)


Farm G Farm F Farm E Farm D Farm C Farm B Farm A
1650 60 16 1500 110 70 25

Actual Production

2000 100 20 2000 200 100 50

Originally planned


Over the course of the years, it became clear that failure to reach production targets was mainly due to managerial and operational failures

This understanding has triggered research that led eventually to a model that balances all production factors. Assumes that the biological component of the RAS is stable and optimal, computerized simulation system was chosen. The simulation enables testing of processes during production. The model performed can serve as a simulation tool for farmers, extension workers and system designers. The data from the Kibbutz Sde Eliyahu RAS were used as a case study.