Publication Date:
2021-05-19
Description:
This study has carried out on five earth ponds of Litopenaeus vannamei shrimps investigation and Mahan Siraf
farm s which located at Helleh site in the Bushehr province from may 2007 .
main objectives’ were : (1) Measurements of quality factors in water and sediment, Planktons and benthoses, (2)
quality factors’ effects on growth and survival of Litopenaeus vannamei.
With respect the time of shrimp stocking and harvesting, the frequencies of water and sediment sampling were
done per 10 day and once per month, respectively. both sediment sampling of the pond beds have done
before and after harvesting.
The measured factors in the water ponds were : pH, salinity, dissolved oxygen, transparency, temperature
(Twice a day in the morning and the afternoon), chlorophyll-a, nitrate,nitrite, orthophosphate, iron, biochemical
oxygen demand, TSS, TDS, Planktons. The parameters (pH, total organic matter, iron) were measured in
sediment. The measurement of grain size has done in two times (before and after harvesting).
independent variables including nitrate, Ammonia, orthophosphate, iron and chlorophyll-a had significant
correlations with shrimp weights as dependent variable. Nitrate showed the highest correlation with the shrimp
weights (r = 0.921). overall correlation of fifth most important factors with the shrimp weights, namely nitrate,
orthophosphate, Ammonia, iron and chlorophyll-a was estimated to r=0.999.
The results show low concentration of the essential nutrient such as phosphate and nitrate, high concentration of
ammonia, undesirable’s transparency, and a great amount of clay in pond beds .
On the basis of above description, required to renewing management in fertilizing, feedings, liming qualities of
the bed.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Ecological
;
Litopenaeus vannamei
;
Investigation
;
Shrimp
;
Salinity
;
Ponds
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
86pp.
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