Publication Date:
2021-05-19
Description:
Kutum, Rutilus frisii kutum, is an commercially important fish in the Caspian Sea. The fish enters the rivers
leading to the Caspian Sea for spawning. One of these rivers is Shiroud River. In the artificial propagation
process of Kutum, different factors are involved in quality and quantity of female broods eggs and also in
the best temperature and migration time for spawning. The influence of temperature and migration time
on some fecundity indices and fertilization rate of female kutum in Shiroud River was studied in the
spawning season. In this study, 90 individual females were studied from February to May 2007. Averages
of total length, weight and age were 43.26 cm, 832.08 g, and 4.41 respectively. Results showed that
maximum egg diameter (1.86 mm), number of eggs per each gram of body weight (309.12), relative
fecundity (56.21) and fertilization rate (95.82 %) were obtained from 5 to 20 April (15.95°C). Maximum
ovary weight (201.00 g) and absolute fecundity of eggs (49987.18) were obtained from 6 to 20 March
(17.74°C). Relationship between temperature and migration time and fecundity indices was linear and
weak.
Description:
Published
Keywords:
Fertilization
;
Rutilus frisii kutum
;
Artificial propagation
;
Water temperature
;
Migration
;
Fecundity
;
Female
;
Fish
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp.9-14
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