Publication Date:
2021-05-19
Description:
This review is started from April 2002 in Gorgan River and continued for one year. Three sampling stations along
the river to the mouth of the estuary were 4000 meters away from the bridge to the village Charqly all samples were
collected in this area.
Four million sturgeon larvae with average weight of 3/2 grams were obtained from martyr Marjani and Vushmgir
Dam farms. Over 40 days released at release stations, and 316 million bony fish fingerlings are being release that 282
million were whitefish, 25 million carp and 9 million bream from Vushmgir Dam and Syjval Bream Center within
two months at the release stations in Gorgan River.
At sampling stations, especially estuaries to determine the shelf life of fry in the river and to determining migration
into the river as well as physical - chemical and assess the frequency and biomass of feeding materials
(phytoplankton, zooplankton, and benthos) at the sampling stations in Gorgan River were studied.
The entire estuary to the sea makes itself. Maximum migration happened at sunset. Average Debbi for 20-year was
at the rate of 14.95 cubic meters per second. In 2002, the annual average was 20.8 cubic meters per second,
respectively.
Evaluation of abundance and biomass of feeding materials (phytoplankton, zooplankton, and benthos) indicates the
status of the average biomass of phytoplankton in the river at the release station was 23/75 mg per liter that was
highest in September and was lowest in December. Mean primary production based on a 145 mg chlorophyll cubic
meters.
6 orders of benthic invertebrates were observed. Benthic including 9 families and 11 genera have been identified
including groups of insects, worms, low-tar and Polychaetes, crustaceans, bivalve and gastropod. But at the release
station (S2) the highest levels of benthic biomass (18/18 grams per square meter) degree of diversity of benthic
organisms (12) species have largely been seen as a maximum in April and minimum in December.
Also zooplankton condition, zooplankton total of 27 genera belonging to five categories, Rotatoria, Kladvsra, Coupe
Pvda, Balanvs, and protozoa were identified. In general, in September zooplankton has the greatest diversity and
abundance and in September and March, the lowest number is observed.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Ecological
;
Capacity
;
Fingerlings
;
Sturgeon
;
Bony fish
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
110pp.
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