Study of kidney and gill function in Salmo trutta caspius fingerlings after move to the Caspian Sea
Caspian trout (Salmo trutta caspius) is an anadromous and valuable fish species in the Caspian Sea. Electrolytes concentration (Mg2+ and Ca2+) and kidney and gill development trend were studied in different weight groups. Specimens in 4 weight groups 5, 10, 15 and 20g. Each trial was done in 3 replicates. The observation of kidney glomeruli in histological sections showed that the diameter of glomeruli in all weight groups in Caspian water decreased after 72h adaptation period (P<0.05). The decrease in 5 g fish was less than the other weight groups (reached 1100inn in 72h). Difference of glomeruli in 5, 10, 15 and 20g groups after 72h of move to the Caspian water in comparison with time of zero was calculated at 500, 1600, 900 and 1300111112, respectively. The results showed that mean diameter of proximal tube in 5, 10, 15 and 20g in time zero was 37.8±4.9, 33.4±3.9, 36.5±7.3, 34±5.9gm, respectively and this parameter reached 41.3±9.1, 33±3.I , 33.4±2.1 and 36.1+6.1 gm after 168 hours of exposure to Caspian Sea water. Hence, in 5g group, this parameter increased over 168h. After transferring 5g juveniles to the Caspian Sea water, Mg2+ concentration in all times was higher than time zero, and then reached 4.2meq/1 after 240h of exposure to the Caspian Sea water. The results show that 5g weight group is not able to balance electrolytes such as Mgt* completely. The number and size of gill chloride cells in 5g juveniles did not change in Caspian Sea water treatment (P>0.05), although in other groups (10, 15 and 20g) a significant increase in chloride cell's number and size was detected. The number of chloride cells on gill's secondary lamellas varied between 3 to 7 (in two gills lamellas).
| Main Authors: | , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Persian |
| Published: |
2010
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| Subjects: | Salmo trutta caspius, Glomeruli, Proximal, Chloride Cell, |
| Online Access: | http://hdl.handle.net/1834/11862 |
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