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Osmotic adaptation, and gill histometric indices of stellate sturgeon (Acipenser stellatus) juveniles in response to the feeding frequency and exposure to environmental salinity
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Seyedeh Maryam Ahmadi1   , Habib Vahabzadeh Roudsari * , Hossein Khara1 , Zabih Ollah Pajand3 , Mohammad Sayad Borani4 |
1- Department of Fisheries, Lahijan Branch, Islamic Azad University, Lahijan, Iran
Department of Fisheries, Lahijan Branch, Islamic Azad University, Lahijan, Iran, Department of Fisheries, Lahijan Branch, Islamic Azad University, Lahijan, Iran , habib.vahabzadeh@gmail.com
3- International Sturgeon Research Institute of the Caspian Sea, Iranian Fisheries Sciences research, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran
4- Inland Waters Aquaculture Research Center, Iranian Fisheries Sciences research, Agricultural Research, Education and Extension Organization (AREEO), Bandar Anzali, Iran |
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Abstract: (1199 Views) |
| The salinity and feeding frequency are two fundamental challenges in breeding stellate sturgeon (Acipenser stellatus) juveniles both for aquaculture and restocking purposes. Osmoregulation indices including, osmolarity enzyme activity, and chloride cells count and size in the gill tissues of 810 stellate sturgeons (weight 10.96±0.89 g and length 12.64±0.96 cm) in 9 treatments combining three salinity levels with three types of feeding during eight weeks of rearing. The treatments included two, four and six times (2T, 4T and 6T) of feeding in combination with zero,6 and 12ppt salinities (0‰, 6‰and 12‰). Osmolarity and activity of Na+-K+-ATPase were affected by salinity, but feeding frequency had no significant impact on them(P>0.05). The amount of sodium (Na+) increased in 2T,12‰, and potassium(K+) increased in 2 T,6‰. The highest number of chloride cells was observed in treatments with the most elevated salinity (12 ppt). The frequency of feeding at the same salinities did not affect the number of chloride cells (P>0.05). The area and perimeter of chloride cells in 2T,12‰ to 6T,12‰ improved with increasing salinity (P<0.05). Changes in the number and size of chloride cells of gill filaments were observed with the least tension after two months of rearing with 2, 4, and 6 times of feeding in brackish water with a salinity of 12‰. |
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| Keywords: Stellate sturgeon, Feeding-frequency, Osmoregulation, Gill tissue |
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Full-Text [PDF 659 kb]
(210 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2023/08/20 | Accepted: 2023/09/3 | Published: 2023/12/22
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