Fingerling production and stock enhancement of Mahisefid (Rutilus frisii kutum) lessons for others in the south of Caspian Sea
Rutilus frisii kutum (Kamensky 1901) is one of the economically important fishes that migrate for spawning to rivers in the Caspian Sea. However, the fish populations have slowly decreased in recent years. The declining of these resources has resulted from some activities by the Iranian Fisheri...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Springerlink
2010
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| Online Access: | http://psasir.upm.edu.my/id/eprint/9565/1/Fingerling%20production%20and%20stock%20enhancement%20of%20Mahisefid%20%28Rutilus%20frisii%20kutum%29.pdf http://psasir.upm.edu.my/id/eprint/9565/ |
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| Summary: | Rutilus frisii kutum (Kamensky 1901) is
one of the economically important fishes that migrate
for spawning to rivers in the Caspian Sea. However,
the fish populations have slowly decreased in recent
years. The declining of these resources has resulted
from some activities by the Iranian Fisheries Organization
(IFO is responsible for stock enhancement)
to catch some broodstocks of Rutilus frisii kutum
from their natural spawning rivers. The broodstocks
are caught for artificial propagation of the fish.
Artificial propagations are carried out every year to
produce fingerlings to be released into the rivers in
the Caspian Sea. In recent years, total catch of this
fish have greatly fluctuated due to the disruption of
the natural spawning grounds and over fishing. The
substantial reduction to 1,298 metric tons, the lowest
total catch reported in 1984–1985, could be due to
over-exploitation of the fishery resources. However,
the total catch has increased after the fingerlings
release programs started in 1979. The total numbers of
Rutilus frisii kutum fingerlings released had increased
from 12 million to 225 million in 2002, to 155 million
pieces in 2003, to 179 million pieces in 2004, 229
million pieces in 2005, 174 million pieces in 2006, 262
million pieces in 2007 and 187.1 in 2008. The total
catch was also increased from 6,417 metric ton to 8,984
metric ton, to 7,036 metric ton, to 9,631 metric ton and
16,117, 17,196, 14,835 in years 2002, 2003, 2004,
2005, 2006, 2007 and 2008, respectively. |
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