Publication Date:
2021-05-19
Description:
Considering the reduction of valuable commercial fish in Anzali lagoon during last decades and presence of the silver crucian carp with high frequency; the research project or 'Biological aspects and population dynamics or Carassius auratus" was designed.
The study area was stratified to four regions (Abknar, Siah-keshim, Markazi and Sheyjan). Sampling were carried out bi-weekly by using electro-shocker. The mean fork length and mean weight for both sexes were measured 19.5±5.8 cm, and 196.8±137.4 g respectively. Also, the mean age was estimated 2.6±1.3 years (n=750) and minimum and maximum fork length were measured 2.5 and 31.5 cm respectively. The mean length, weight and the age of silver crucian carp in Siah-keshim region were higher than the other regions. The spawning season of this species was found from May to June. The results showed a sex ratio of
F:M=99.3:0.7.
Some calculated population parameters were as follows: exploitation rate = 0.47, L∞ = 36.0 cm and K = 0.23 per year.
Description:
Published
Keywords:
Biological
;
Commercial
;
Population
;
Carassius auratus gibelio
;
Fish
;
Silver crucian carp
;
Carassius auratus
;
Sampling
;
Length
;
Age
;
Weight
;
Spawning
;
Species
;
Sex ratio
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp.57-70
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