A STUDY OF STARVATION AND FEEDING PERIOD CONSEQUENCES ON CORTISOL CONCENTRATIONS AND GROWTH INDEXES IN RAINBOW TROUT, ONCORHYNCHUS MYKISS (WALLBAUM, 1792)

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RAHIMI R.; FARHANGI M.; MAJAZI AMIRI B.; REZAEI F.; KARIMI M.R.

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Journal: JOURNAL OF AQUATIC SCIENCES Year:2010 | Volume:1 | Issue:1 Page(s): 13-21

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Title

A STUDY OF STARVATION AND FEEDING PERIOD CONSEQUENCES ON CORTISOL CONCENTRATIONS AND GROWTH INDEXES IN RAINBOW TROUT, ONCORHYNCHUS MYKISS (WALLBAUM, 1792)

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Keywords

CORTISOLQ2

FASTINGQ2

FOOD COEFFICIENT RATIOQ3

FOOD INTAKEQ2

RAINBOW TROUTQ2

REFEEDINGQ2

SPECIAL GROWTH RATIOQ2

Abstract

This study aimed to show the difference in CORTISOL concentrations and growth indexes with different starvation and feeding period consequents according to the IGF-I hormone level in blood with 4 treatments in 3 replications. Other indexes like FOOD COEFFICIENT RATIO (FCR), Specific Growth Rate (SGR) and daily FOOD INTAKE were also examined during the experiment. Fish were fed twice a day ad libitum as follow during the 65 days: Treatment A (TA): Control treatment; Continious feeding, Treatment B (TB): 4 weeks starvation and 5 weeks REFEEDING, Treatment C (TC): 3 weeks of starvation and 5 weeks of REFEEDING, Treatment D (TD): 2 weeks of starvation and 5 weeks of REFEEDING. Each tank was containing 23 fishes in each unit with an initial mean weight (SD) 47.19±0.42. Blood were sampled for CORTISOL concentration measurment at the beginning of the experiment and at the end of the starvation and every 12 days in REFEEDING periods. There were no significant difference between the treatments in FCR (P<0.05). TB and TC had significant difference (P<0.01) compare to other treatments in SGR but no significant difference were observed among themselves (P<0.05). CORTISOL concentrations came up in compare with control treatment at the end of the starvation (Day 29) (P<0.05) but no significant trend were observed among the treatments during REFEEDING period (P>0.005). According to the effects of handling and environmental on CORTISOL changes could be suggest should be reduce handling and stress to achieve distinctive results.

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APA: Copy

RAHIMI, R., FARHANGI, M., MAJAZI AMIRI, B., REZAEI, F., & KARIMI, M.R.. (2010). A STUDY OF STARVATION AND FEEDING PERIOD CONSEQUENCES ON CORTISOL CONCENTRATIONS AND GROWTH INDEXES IN RAINBOW TROUT, ONCORHYNCHUS MYKISS (WALLBAUM, 1792). JOURNAL OF AQUATIC SCIENCES, 1(1), 13-21. SID. https://sid.ir/paper/238415/en

Vancouver: Copy

RAHIMI R., FARHANGI M., MAJAZI AMIRI B., REZAEI F., KARIMI M.R.. A STUDY OF STARVATION AND FEEDING PERIOD CONSEQUENCES ON CORTISOL CONCENTRATIONS AND GROWTH INDEXES IN RAINBOW TROUT, ONCORHYNCHUS MYKISS (WALLBAUM, 1792). JOURNAL OF AQUATIC SCIENCES[Internet]. 2010;1(1):13-21. Available from: https://sid.ir/paper/238415/en

IEEE: Copy

R. RAHIMI, M. FARHANGI, B. MAJAZI AMIRI, F. REZAEI, and M.R. KARIMI, “A STUDY OF STARVATION AND FEEDING PERIOD CONSEQUENCES ON CORTISOL CONCENTRATIONS AND GROWTH INDEXES IN RAINBOW TROUT, ONCORHYNCHUS MYKISS (WALLBAUM, 1792),” JOURNAL OF AQUATIC SCIENCES, vol. 1, no. 1, pp. 13–21, 2010, [Online]. Available: https://sid.ir/paper/238415/en

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