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IJFS 2018, 17 Back to browse issues page
Effects of Arthrospira platensis on growth, skin color and digestive enzymes of Koi, Cyprinus carpio
F. Ansarifard, H. Rajabi Islami *, M. Shamsaie Mehrjan, M. Soltani
Department of Fisheries, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775,Tehran, Iran. , rajabi.h@srbiau.ac.ir
Abstract:   (2106 Views)
This study evaluated the effects of diets containing 0, 2.5, 5, 7.5 and 10% Arthrospira platensis on skin pigmentation, growth performance, and digestive enzymes of koi, Cyprinus carpio. A completely randomized design was performed with five treatments and three replicates. One hundred and fifty koi fish with average initial weight of 30±1g were assigned to fifteen experimental tanks. The experiment lasted for eight weeks. Koi fish fed with 2.5% A. platensis (1.17±0.02) showed a significant lower growth performance than those fed with 7.5 and 10% A. platensis (1.39±0.02 and 1.46) (p<0.05). However, carotenoid (astaxanthin) concentrations of skin significantly increased with increased levels of dietary algae (p<0.05). The highest values of a* (red zones) and b* (yellow zones) were observed in fish skin fed with 10% A. platensis (4.33±0.15, 5.23±0.15, 5.23±0.15, 5.7±0.36, and 6.33±0.32, respectively). The activities of protease, amylase and lipase in dietary supplementation of 10%A. platensis were significantly higher than those of the control group (protease from 5.17±0.76 to 11 , amylase from 22±1.73 to 32.67±1.53 and lipase from 16.33±2.08 to 74.33±1.53. Liver enzymes also decreased significantly by increased dietary supplementation. (ALT: from 192.33±5.5 to 80.67±1.52, AST: from 1741.7±18.92 to 712.33±10.5, ALP: from 452.33±8.14 to 48±1, LDH: from 7287.3±34.64 to 7119.7±17.89). These results revealed that inclusion of 5-10% A. platensis in diets has a significant positive effect on growth rate, pigmentation, and improvement of digestive and liver enzymes activities in koi fish.
Keywords: Arthrospira platensis, Pigmentation, Growth, Carotenoids, Enzymes activities, Koi
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Type of Study: Orginal research papers |
Received: 2018/03/17 | Accepted: 2018/03/17 | Published: 2018/03/17
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Ansarifard F, Rajabi Islami H, Shamsaie Mehrjan M, Soltani M. Effects of Arthrospira platensis on growth, skin color and digestive enzymes of Koi, Cyprinus carpio. IJFS. 2018; 17 (2) :381-393
URL: http://jifro.ir/article-1-3357-en.html

Volume 17, Issue 2 (2018) Back to browse issues page
مجله علوم شیلاتی ایران Iranian Journal of Fisheries Sciences
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