Abstract
Age-related physiological characteristic of crucian carp inhabiting Lake Yedang were analyzed to compare the ecophysiological distribution of Carassius auratus (n = 1,537) and C. cuvieri (n = 1,385). Crucian carps were collected and analyzed biomass, gender, and hematological parameters by age group. Age distribution of one-year-old (OYO) fish were dominant group which is 27.3% and 28.7% for C. auratus and C. cuvieri, respectively, whereas the distribution of over five-year-old fish were decreased. OYO biomass of C. auratus and C. cuvieri were 42.0 g and 64.4 g, respectively. A distinct characteristic between two species were observed in four-year-old fish, i.e. C. cuvieri have shown an increase of biomass, total length, and body height in comparison to C. auratus. A distribution of OYO male and female were 43.3%, and 24.4%, respectively. However, the male proportion were decreased with age increase. Hematological analysis revealed that C. auratus collected in the season of spring and summer showed an increase of serum albumin and glucose, while carps collected in the season of summer and fall showed a decrease of cholesterol and an increase of calcium and globulin compared to those samples collected in the season of winter and spring. These results are considered to be effective for estimation and management of freshwater aquatic resources.
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