GROWTH CHARACTERISTICS AND DIFFERENT FEEDING STRATEGIES ON THE GROWTH PERFORMANCE OF JUVENILE MISGURNUS ANGUILLICAUDATUS

This experiment aims to investigate the effects of different feeding strategies on the growth and development of loach juveniles in order to screen out ideal bait combination. By fitting and analyzing the early growth curve of loach, the preliminary characteristics of early growth of loach are explored, providing reference for the cultivation and healthy breeding of loach culture. Loach with an average weight of about 0.01 g was fed in stages with egg yolk, rotifer, artemia and compound feed. The total length of each group was weighed and measured at the 15dph, 40dph and 55dph. The effects of different feed combinations on the growth performance of Loach juvenile fish were compared, and SPSS 26.0 was used for ANOVA, growth curve fitting and regression analysis. During the period of 15—40dph, the SGR (9.50±0.18)% in the rotiferworm+artemia+egg yolk group was significantly higher than that in the rotifer+egg yolk group (7.40±0.13)% and artemia group (5.75±0.04)% (P<0.05). During 41—55dph, the SGR in the artemia+compound feed group was the highest, at (8.89±0.49)%, which was significantly higher than that in the rotifer+artemia+egg yolk and artemia+yolk+compound feed group (P<0.05). The changes in final length, final weight, and WGR are the same as SGR trends. The growth curve fitting and regression analysis were carried out on rotifer+artemia+egg yolk in the early stage of 15—40dph and Artemia+compound feed group at 41—55dph in the later stage, and the relationship between total length and days was consistent with the quadratic cubic equation: TL=1E–05x³–0.0007x²+0.0679x+0.4071 (R²=0.995). The relationship between body weight and days is in line with the cubic equation: BW=5E–06x³–0.0002x²+0.0048x–0.0125 (R²=0.958); The relationship between total length and weight conforms to the power function equation: LWR=0.0062x^2.7838 (R²=0.988). This experiment showed that feeding loach juveniles with rotifer+artemia+egg yolk from 15—40dph in the early stage, and artemia+compound feed from 41—55dph in the later stage, resulted in better growth performance. There was a significant power function relationship between body weight and total length of loach juveniles: LWR=0.0062x^2.7838(R²=0.988), and the b value was significantly less than 3 (P<0.05), which was a negative allokinetic growth mode.