Publication Date:
2021-05-19
Description:
A study was conducted to determine , feeding , reproduction in 12 stations in the Caspian Sea basin
of Iran including Anzali wetland (lagoon), Ghorigol wetland, Neor lake , south Caspian coastal water
(Iranian of shore), and several springs in Alborz mountains In addition sampling of Plankton and
physical and chemical factors of the water body were also done in all stations. Special aquariums
were designed to test the acclimation of the 7 amphipoda in pond culture. This process was performed
from march 2001 to Feb 2003. The finding showed that while reproduction of Gammarus lacustris and Gammarus paricrenatus
were only about 3 months , that Gammarus komareki lasted throught the year.
From diet studies of intestine content have been showed that there is not a correlation between
abundance and diversity of plankton with habitat for all species, except about Pontogarnrnarus
maeoticus and P. borceae from Kelachi coast that had a high plankton abundance.
Gammarus aequicauda (37.75 ± 31.04) and Obesogammarus acuminatus (49.07 ± 40.4) had the
maximum of average eggs production while G. komareki had the lowest clutch sizes with mean about
7-8 eggs. Species tolerance to changes in environmental factors (Physical and chemical variation) were limited
in the springs while those off coastal water species and Obesogammarus acuminatus were wider.
In aquarium (laboratory) study, it was found that although Gammarus lacustris showed some growth
but did not reproduce. Gammarus paricrenatus, in later stage of study, reproduced and grow in length
during most experiment period.
Although Gammarus komareki survived and a little active life, but was not able to acclimate itself to
laboratory condition.
The findings showed that four species P. maeoticus, P. borceae, O. acuminatus, and G. aequcauda , seems to be good candidate for acclimation study in warm water fish farms. Their living in the ponds
can be enhanced by some limited alteration in substrate structure (P. maeoticus, P. borceae),
presence of submerged aquatic plants (O. acuminatus) and higher water salinity (more than 2 ppt) for
G. aequcauda..
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Gammarus paricrenatus
;
Gammarus lacustris
;
Gammarus komareki
;
Obesogammarus acuminatus
;
Feeding
;
Biological
;
Gammaridae
;
Amphipoda
;
Fish Culture
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
157pp.
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