The age and growth parameters of the brond-snout, Chondrostoma regium
in Beheshtabad River of Chaharmahal & Bakhtiari Province were investigated
during April 2013 to April 2014. The males ranged between 8.04-22.10cm and 5.20-
105.00g. The females ranged between 7.84-23.15cm and 8.70-155.00g. Males were
categorized in age classes 1+-5+ and females in age classes 1+-6+. The age class 3+
was the dominant one in the whole samples. The length-weight relationship for
males, females and all individuals was as W=0.0089L3.045 (r2=0.95), W=0.0082L3.109
(r2=0.85) and W=0.0107L3.000 (r2=0.92), respectively, indicating a positive
allometric growth pattern for the females and an isometric growth for the males and
all fish. The age-length and age-weight relationships in males and females were
estimated as Lt=26.23[1-e-0.267(t+0.483)], Wt=160.77[1-e-0.267(t+0.483)]3.045 and
Lt=31.89[1-e-0.148(t+2.067)], Wt=266.11[1-e-0.148(t+2.067)]3.109, respectively. The growth
performance index (Ф') value was 3.84 in males and 2.18 in females, indicating a
faster growth rate in males. The mean condition factor was 1.02±0.01 for males and
1.14±0.02 for females. The relative length of gut was 1.18±0.05 for all fish,
indicating a herbivorous habit for this fish. The highest mean feeding intensity of
males was in July and the lowest in March and April. In the female, the highest was
in January and the lowest in June. The highest mean value of Gut vacuity index of
males and females was in the spring and the lowest in summer. About 55% of the
studied stomachs were full. The highest number of empty stomachs was in May
(80%) and the lowest in July (32%). Based on the mean Gut vacuity index (48%),
this fish is considered a medium feeding fish (40 Age-Length, Age-Weight, Cyprinidae, Length-Weight relationship
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