EFFECT OF FASTING AND RE-FEEDING ON GROWTH PERFORMANCE, BIOCHEMICAL PARAMETERS OF BROWN TROUT (SALMO TRUTTA FARIO) AND RAINBOW TROUT (ONCORHYNCHUS MYKISS)
T. Karataş
Health Services Vocational School, Agri Ibrahim Cecen University, 04100 Agri, Turkey
Corresponding Author’s E-mail: tkaratas025@gmail.com; tkaratas@agri.edu.tr
ABSTRACT
The aim of this study was to investigate the effect of short-term fasting and re-feeding on growth performances, body compositions and biochemical parameters of brown trout (Salmo trutta fario) and rainbow trout (Oncorhynchus mykiss) with an average initial weight of 200±5 g. The 80 brown trout were placed in four tanks. 80 rainbow trout was placed in the other four tanks and 4 different feeding protocols were applied for both species; Control: every day, feeding twice a day; T1: 1 day of deprivation and3 days of re-feeding; T2: 2 days of deprivation and 6 days of re-feeding; T3: 3 days of deprivation and 9 days of re-feeding. Short-term fasting and re-feeding period took 30 days. At the end of the experiment, the weight gain (WG%) and specific growth rate (SGR%) of the control and treatment groups of the rainbow trout were higher than the values of the brown trout (p<0.05). But, no significant differences between the control and treatment groups of both species in terms of biochemical parameters and body compositions were observed (p>0.05). As a result, after the short-term fasting and re-feeding exposure, rainbow and brown trout showed a good growth performance. In addition, these trout could be fed without significant health damage in terms of physiological parameters.
Keywords: Rainbow trout, brown trout, growth, biochemical parameters, body composition, fasting, re-feeding.
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