Observation and analysis of growth dynamics in Oujiang color common carp with different pigmentation types

Abstract:

The hybrids derived from a complete diallel cross of the five selective strains of Oujiang color common carp (Cyprinus carpiovar.color) were used to observe and analyze developmental dynamics of five growth related traits (e.g. body weight (BW), total length (TL), standard length (SL), pre dorsal height (PDH) and pre dorsal width (PDW) in the five pigmentation types of Oujiang color common carp, including whole red (WR), whole red with big black spots (RB), whole red small black spots (RS), whole white with big black spots (WB) and whole white (WW). The results showed that the same “S” characteristics for growth were found in the five pigmentation types of carp. The highest absolute growth rate (AGR) and special growth rate (SGR) were observed during June and October， indicating their faster growth stages during these months. The fishes of RB and WB displayed higher growth rate than fishes of the other pigmentation types from juvenile stage, but the fish of WW was the slowest in growth. The relative high coefficient of variation (C.V=8%-35%) for body weight were detected in the five pigmentation types of carp in each month. There was significant linear correlation for body weight between each previous month and last month and the determination coefficients as gradually increased as growth (r2=0.000 2-0.993 6，P<0.01). Condition factors of the five pigmentation types of Oujiang color common carp were from 3.22 to 3.71 before July in the second year growth stage, then gradually increased to roughly 3.7 after July. Condition factors of WR were the highest at each month, however WW and WR showed relatively low condition factors in each study month. The study provided a theoretical basis for further selective breeding of Oujiang color common carp.