Age, growth and reproduction characteristics of brond-snout (Chondrostoma regium) in Alvand River (Kermanshah province)
Subject Areas : New Technologies in Aquaculture Development
Mehdi
Shamsaie Mehrgan
1
(Department of Fisheries, Science and Research Branch, IAU)
Keywords: Kermanshah, Reproduction, Keywords: Growth, Chondrostoma regium,
Abstract :
AbstractIn this study, some characteristics of growth, age and reproduction of brond-snout (Chondrostoma regium) population were studied in Alvand River of Kermanshah province monthly for one year from June 2019 to May 2020. A total of 6 age groups (1-6) were identified. 120 females and 105 males with a sex ratio (female to male) 1.06: 1 was detected from 225 caught fish. The predominant age was 4 years and the mean total length in the males and females were 205.23±22.42 mm and 234.09 ±29.42 mm, respectively, which showed a significant difference between the genders (p≤0.05). The length-weight linear relationship for male and female were Lt = 310[1-e -0.31(t+0.52)] and Lt = 327[1-e -0.34(t+0.49)], respectively. The growth pattern for male and female was allometric negative and allometric positive, respectively, and the mean obesity coefficient for male and female were 1.01±0.11 and 0.99±0.08, respectively. The mean absolute fecundity of fish was 11921.22±2284.54, which increased with the age and decreased egg diameter. The mean gonad index for male and female was 1.8±0.13 and 8.64±0.72, respectively (p≤0.05).
_||_