Effect of Photoperiod Manipulation on Growth Performance,Physiological and Hematological Indices in Juvenile Persian Sturgeon,Acipenser persicus |
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| Authors: | Bahram Falahatkar Samaneh Poursaeid Iraj Efatpanah Bahman Meknatkhah Amal Biswas |
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| Affiliation: | 1. Fisheries Department, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, P.O. Box 1144, Guilan, Iran;2. Young Researchers Club, Rasht Branch, Islamic Azad University, Rasht, Guilan, Iran;3. Dr. Yousefpour Fish Hatchery Center, Siahkal, Guilan, Iran;4. Fisheries Laboratory, Kinki University, Uragami, Nachikatsuura, Wakayama 649–5145, Japan |
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| Abstract: | The effect of five different light regimes on growth, stress and hematological indices was studied in Persian sturgeon, Acipenser persicus. Fish with average weight of 645.3 ± 11.2 g were subjected to different photoperiods (24 L, 12 L:12 D, 16 L:8 D, 8 L:16 D and 24 D) for 8 wk. Blood samples were collected at the end of the experiment for measuring cortisol, glucose and hematological features. The whole growth parameters showed no significant difference. Plasma cortisol concentration was significantly higher in 12 L:12 D, while the lowest level was observed in fish exposed to 24 D. No significant changes were observed among the treatments for glucose concentration. Lactate concentration varied significantly among the treatments. Some hematological indices including hematocrit and number of white blood cells were affected by different light regimes, but the others (hemoglobin and number of red blood cells) were not affected significantly. The results showed that photoperiod manipulation can alters some stress‐related metabolites and may enhance growth rate in fish exposing to continuous darkness. |
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