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The long term effect of salinity and temperature challenge on some physiological indices of Convict Cichlid (Cichlasoma nigrofasciatum Gunther, 1867)
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Babak Ataimehr   , Roya Madani , Mahmood Bahmani , Arya Ashja Ardalan |
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Abstract: (4899 Views) |
| Changes in levels of cortisol, glucose, Na+, Cl-, K+ ions, muscle water content, the size and number of gill chloride cells as well as mortality percentage of Convict Cichlid (Cichlasoma nigrofasciatum) with mean weight of 3.70±0.93 g were investigated under various salinities (fresh water, 10 and 20 gl-1) and temperatures (20, 25 and 35 °C) for 60 days. Sampling was done at the beginning of the test, and the days of 30 and 60 after the test. Cortisol, glucose, Na+, Cl-, K+ ions, the size and number of gill chloride cells were increased after 30 days of the test and the maximum levels were obtained in 20 gl-1 at 20 °C on day 30 of the test. Muscle water content were decrease after 30 days of the test and the minimum level was obtained in 20 gl-1 at 20 °C on 30 days of the test. Mortality percentage was increased after 30 days of the test and reached the maximum level in 20 gl-1 at 20 °C on 30 days of the test. All of the fish were died until the end of the experiment. Based on obtained results, it seems that the salinity more than 10 g -l and temperature lower than 25 oC is not suitable for rearing of Convict Cichlid. |
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| Keywords: Stress, Salinity, Temperature, Physiological indices, Cichlasoma nigrofasciatum. |
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Full-Text [PDF 93 kb]
(1216 Downloads)
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Type of Study: Research |
Subject:
Fisheries
Received: 2015/07/12 | Accepted: 2015/07/12 | Published: 2015/07/12
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