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but also substantial declines in the use of antibiotics (GESAMP, 1996). Nevertheless ... Gill, 1987). Feed conversion efficiencies (FCE) and feeding ratio (FR), for.
Ribarstvo, 57, 1999, (4), 149—161 T. V. Espersen et al.: An industrial–scale study

ISSN 1330–061X CODEN RIBAEG

UDK 597.553.2:615.37 Original scientific paper

AN INDUSTRIAL–SCALE STUDY ON THE IMPACT OF VACCINATION UPON RAINBOW TROUT PERFORMANCE T. V. Espersen, A. Fønss, B. D. Vestbö, E. McLean, E. Teskered‘i}, Z. Teskered‘i}

Summary The effect of intraperitoneal (ip) vaccination upon the performance of rainbow trout (n = 1611), maintained under commercial production conditions (aerated spring water, 9.8 ºC, 150 L/min), was evaluated over a 7–week period. Vaccine impact was examined with reference to control (n = 1683) and injected control (sterile filtered water; n = 1537) animals. All groups were run in triplicate (i. e., n ≥ 500 fish per gorup). Animals were fed to satiation twice daily. Vaccination suppressed (P