Publication Date:
2021-05-19
Description:
The purpose of this study was to investigate the possibility of natural reproduction of indanger fish in the
southern Caspian Sea in Tajan, Haraz,Sardabrood and Chalos rivers, and identify suitable habitats for this
species in the study area as a genetic reserve.Sampling of physical and chemical parameters of water,
macrobenthic invertebrates and fish fauna was conducted seasonaly in each rivers at selected stations from
febrary 2010 during one year. Macrobenthic invertebrate sampling were used bySorber sampler and fish was
collected by gill net and electroshocker set with a voltage of 1.7 A and 100-300 V.
A total of 53 taxa of macrobenticinvertabrateshave been identified in the four mentioned rivers, in which
Tajanriverconsisted of 47 taxa with highest richness.20 species of fish were determined in the studied rivers that
6 of them were non-native species.The results showed that the predominant identified fish species were native in
the river. The fish species diversity increases as one moves from the headstream towards the estuaries of the two
studied Sardabrud and Chalus rivers.The results of this study showed that the relative abundance of fish species
resistant to pollution and hard environmental conditions were much more that sensitive species. physicochemical
parameters of water such as; water temperature, DO, BOD5, pH, TSS, TDS, EC, turbidity, nutrients, biodiversity
index such as Shanon index, EPT, HFBI, EPT/CHIR, nutrition functioning group and present or absent of fish
species showed that there are significant decrease in water qualities from upstraem ratio to down stream (For
example, in Tajan river water turbidity varied from 0 at station 1 to 333 NTU at station 6, Which is strongly
influenced by sand workshops. As well as the activities of a significant impact of fish farming workshop on the
Haraz river water quality). The minimum of HFBI index was 2.84 at station 1 and the maximum was recorded at
station 5 with 6.01, and there is not any possibility to natural reproduction of migrated species that are dominant
and indanger at downstream. Conditions for natural reproduction of this species in the rivers of srdabrood and
Chalus there is to some. In Shahid- Rajaei dam the maximum relative abundance of fish species belonged to
Capoeta capoeta, Luciobarbus capito and Squalius cephalus, respectively. These species have different age,
length and weight stuctures at Shahid- Rajaei dam inhabitant, and the resourval of this dam and it,s upstream
have been preparing auch a favorabile condition that seems there are potentioal of introductionand inhabitant of
some of the Migratory and indanger fish species such as Barbels, Sturgeon, Alburnus chalcoides and etc. as
genetic reserve for biodiversity preservation.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Inhabitant
;
Pollution
;
Rehabilitation
;
Indanger fish species
;
Alburnus chalcoides
;
Squalius cephalus
;
Luciobarbus capito
;
Capoeta capoeta
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
70pp.
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