Evaluation of Artemia Stock in Urmia lake
Stock assessment of Urmia Lake Artemia between 2000-2001 revealed intense decreasing cysts and biomass compared the previous years. Reducing annual rain falling from 32 to 18 cm in west Azarbayjan province lowered fresh water entrance from 4 billion m3 to 1.8 billion m3 to the lake as in 2001 the water volume reached to 6 billion m3 . Decreasing more than 2 billion m3 water volume of the lake per year with increasing the evaporation rate and existence of 5 billion tons salt inside the lake increased water salinity from 17% (1999) to 23.3% (2001) with max- min range of 250-258 ppt without any differences between the seasons. Mean transparency measured with Sechi disk was 138 cm (maximum 215 in Autumn and minimum 51 cm in Spring). Annual mean of water temperature 15 with fluctuation of 6 in winter to 22.13 in Autumn. this study, Artemia (different life stages) and phytoplankton were sampled by planktonic net from 12 suit stations which were selected from 36 sites used in previous Artemia stock assessment project done by Gent University, 1995. Phytoplankton sample identified and counted using identifying key and microscopic study. Results showed that in winter, the number of cysts per cubic meter 756 (minimum) and 2015 (maximum) in Autumn, with annual mean of 1000.m-3. Minimum 0.7 g.m-3 biomass wet weight (without cysts) were obtain in winter while the maximum (9.22 g.m-3) was in spring. The numbers of different nauplii stages per cubic meter with range of 0.03 in winter to 9.22 in spring( mean of 2.46) and juvenile stage per cubic meter were between 0.05 in winter to 1.16 in spring( mean= 0.66). It's showed higher percentage of larval stages in spring toward to higher juvenile and adults stages in summer to mid-autumn. Only Dunaliella and Nitzschia were identified but Dunaliella was dominated ( 95% of total identified phytoplankton with higher abundance, 31000 cells.L-1 in spring season(especially in May and June). Total biomass concluding cysts in studied year was 2700 tons( 30 tons cysts and 2670 tons other biomass which with 10% harvestable biomass,3 tons cysts and 267 tons other biomass could be harvested without any diverse effects on Artemia stock. Cysts and biomass were found more in central to southern part of the lake . The best season for cysts harvesting were Autumn follow by Spring and for biomass harvest were Summer follow by Autumn.
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Language: | Persian |
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Iranian Fisheries Science Research Institute
2016
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Subjects: | Artemia urmiana, Stock assessment, Phytoplankton, Dunaliella, Nitzschia, |
Online Access: | http://hdl.handle.net/1834/13851 |
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dig-aquadocs-1834-138512021-05-19T06:52:03Z Evaluation of Artemia Stock in Urmia lake Hafezieh, Mahmoud Negarestan, H. Esmailli, L. Ganji, S. Ahmadi, R. Mostafazadeh, B. Taghavi, A. Sepahdari, A. Shoahassani, A. Gholi hossienpor, R. Artemia urmiana Stock assessment Phytoplankton Dunaliella Nitzschia Stock assessment of Urmia Lake Artemia between 2000-2001 revealed intense decreasing cysts and biomass compared the previous years. Reducing annual rain falling from 32 to 18 cm in west Azarbayjan province lowered fresh water entrance from 4 billion m3 to 1.8 billion m3 to the lake as in 2001 the water volume reached to 6 billion m3 . Decreasing more than 2 billion m3 water volume of the lake per year with increasing the evaporation rate and existence of 5 billion tons salt inside the lake increased water salinity from 17% (1999) to 23.3% (2001) with max- min range of 250-258 ppt without any differences between the seasons. Mean transparency measured with Sechi disk was 138 cm (maximum 215 in Autumn and minimum 51 cm in Spring). Annual mean of water temperature 15 with fluctuation of 6 in winter to 22.13 in Autumn. this study, Artemia (different life stages) and phytoplankton were sampled by planktonic net from 12 suit stations which were selected from 36 sites used in previous Artemia stock assessment project done by Gent University, 1995. Phytoplankton sample identified and counted using identifying key and microscopic study. Results showed that in winter, the number of cysts per cubic meter 756 (minimum) and 2015 (maximum) in Autumn, with annual mean of 1000.m-3. Minimum 0.7 g.m-3 biomass wet weight (without cysts) were obtain in winter while the maximum (9.22 g.m-3) was in spring. The numbers of different nauplii stages per cubic meter with range of 0.03 in winter to 9.22 in spring( mean of 2.46) and juvenile stage per cubic meter were between 0.05 in winter to 1.16 in spring( mean= 0.66). It's showed higher percentage of larval stages in spring toward to higher juvenile and adults stages in summer to mid-autumn. Only Dunaliella and Nitzschia were identified but Dunaliella was dominated ( 95% of total identified phytoplankton with higher abundance, 31000 cells.L-1 in spring season(especially in May and June). Total biomass concluding cysts in studied year was 2700 tons( 30 tons cysts and 2670 tons other biomass which with 10% harvestable biomass,3 tons cysts and 267 tons other biomass could be harvested without any diverse effects on Artemia stock. Cysts and biomass were found more in central to southern part of the lake . The best season for cysts harvesting were Autumn follow by Spring and for biomass harvest were Summer follow by Autumn. Iranian Fisheries Science Research Institute Published 2018-08-08T10:48:20Z 2018-08-08T10:48:20Z 2016 Report Refereed http://hdl.handle.net/1834/13851 fa 50198; 74pp. Iran Urmia Lake Iranian Fisheries Science Research Institute Tehran, Iran |
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Artemia urmiana Stock assessment Phytoplankton Dunaliella Nitzschia Artemia urmiana Stock assessment Phytoplankton Dunaliella Nitzschia |
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Artemia urmiana Stock assessment Phytoplankton Dunaliella Nitzschia Artemia urmiana Stock assessment Phytoplankton Dunaliella Nitzschia Hafezieh, Mahmoud Negarestan, H. Esmailli, L. Ganji, S. Ahmadi, R. Mostafazadeh, B. Taghavi, A. Sepahdari, A. Shoahassani, A. Gholi hossienpor, R. Evaluation of Artemia Stock in Urmia lake |
description |
Stock assessment of Urmia Lake Artemia between 2000-2001 revealed intense decreasing cysts and biomass
compared the previous years. Reducing annual rain falling from 32 to 18 cm in west Azarbayjan province
lowered fresh water entrance from 4 billion m3
to 1.8 billion m3
to the lake as in 2001 the water volume reached
to 6 billion m3
. Decreasing more than 2 billion m3
water volume of the lake per year with increasing the
evaporation rate and existence of 5 billion tons salt inside the lake increased water salinity from 17% (1999) to
23.3% (2001) with max- min range of 250-258 ppt without any differences between the seasons. Mean
transparency measured with Sechi disk was 138 cm (maximum 215 in Autumn and minimum 51 cm in Spring).
Annual mean of water temperature 15 with fluctuation of 6 in winter to 22.13 in Autumn. this study, Artemia
(different life stages) and phytoplankton were sampled by planktonic net from 12 suit stations which were
selected from 36 sites used in previous Artemia stock assessment project done by Gent University, 1995.
Phytoplankton sample identified and counted using identifying key and microscopic study. Results showed that
in winter, the number of cysts per cubic meter 756 (minimum) and 2015 (maximum) in Autumn, with annual
mean of 1000.m-3. Minimum 0.7 g.m-3 biomass wet weight (without cysts) were obtain in winter while the
maximum (9.22 g.m-3) was in spring. The numbers of different nauplii stages per cubic meter with range of 0.03
in winter to 9.22 in spring( mean of 2.46) and juvenile stage per cubic meter were between 0.05 in winter to 1.16
in spring( mean= 0.66). It's showed higher percentage of larval stages in spring toward to higher juvenile and
adults stages in summer to mid-autumn. Only Dunaliella and Nitzschia were identified but Dunaliella was
dominated ( 95% of total identified phytoplankton with higher abundance, 31000 cells.L-1 in spring
season(especially in May and June). Total biomass concluding cysts in studied year was 2700 tons( 30 tons cysts
and 2670 tons other biomass which with 10% harvestable biomass,3 tons cysts and 267 tons other biomass could
be harvested without any diverse effects on Artemia stock. Cysts and biomass were found more in central to
southern part of the lake . The best season for cysts harvesting were Autumn follow by Spring and for biomass
harvest were Summer follow by Autumn. |
format |
Report |
topic_facet |
Artemia urmiana Stock assessment Phytoplankton Dunaliella Nitzschia |
author |
Hafezieh, Mahmoud Negarestan, H. Esmailli, L. Ganji, S. Ahmadi, R. Mostafazadeh, B. Taghavi, A. Sepahdari, A. Shoahassani, A. Gholi hossienpor, R. |
author_facet |
Hafezieh, Mahmoud Negarestan, H. Esmailli, L. Ganji, S. Ahmadi, R. Mostafazadeh, B. Taghavi, A. Sepahdari, A. Shoahassani, A. Gholi hossienpor, R. |
author_sort |
Hafezieh, Mahmoud |
title |
Evaluation of Artemia Stock in Urmia lake |
title_short |
Evaluation of Artemia Stock in Urmia lake |
title_full |
Evaluation of Artemia Stock in Urmia lake |
title_fullStr |
Evaluation of Artemia Stock in Urmia lake |
title_full_unstemmed |
Evaluation of Artemia Stock in Urmia lake |
title_sort |
evaluation of artemia stock in urmia lake |
publisher |
Iranian Fisheries Science Research Institute |
publishDate |
2016 |
url |
http://hdl.handle.net/1834/13851 |
work_keys_str_mv |
AT hafeziehmahmoud evaluationofartemiastockinurmialake AT negarestanh evaluationofartemiastockinurmialake AT esmaillil evaluationofartemiastockinurmialake AT ganjis evaluationofartemiastockinurmialake AT ahmadir evaluationofartemiastockinurmialake AT mostafazadehb evaluationofartemiastockinurmialake AT taghavia evaluationofartemiastockinurmialake AT sepahdaria evaluationofartemiastockinurmialake AT shoahassania evaluationofartemiastockinurmialake AT gholihossienporr evaluationofartemiastockinurmialake |
_version_ |
1756076543755419648 |