Publication Date:
2021-05-19
Description:
Caspian brown trout (Salmo trutta caspius) is one of the economically valuable species in the Caspian Sea.
Artificial propagation and production of larvae are the main problems in the early culture of this species.
The purpose of this paper is to study the effect of reproductive performance of female broods on
opposition reproduction efficiency in Caspian brown trout in the breeding season of 2009. Three groups of
female broods (4, 5 and 6 years old) were fertilized with 9 male fish individually. The results showed that,
6 year old females have maximum body weight (2150.0 ± 86.6 g), total length (59±2 cm), eggs weight (255.0
± 30.51 g), egg size (5.37 ± 0.058 mm) and absolute fecundity rate (3060 ± 366.15), while highest average
number of ovules in each gram of body weight (16.33 ± 0.58) and relative fecundity (2.08 ± 0.12) belonged
to 4 years old females. There were significant differences in mean fertilization rate and survival rate until
absorption of yolk sack stage (p〈0.05) among the treatments studied. The present study showed that the
eggs produced from fertilization of 6 year old female eggs and male mixed milt showed maximum
average fertilization percentage (97.5 %), survival rate until eyed stage (92%), hatching percentage (93%),
and survival rate until absorption of yolk sack (94.5%).
Description:
Published
Keywords:
Reproductive
;
Performance
;
Salmo trutta caspious
;
Age
;
Female
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp.97-103
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