Effects of Different Diets on Growth and Body Color of Grass Goldfish
In order to evaluate the effect of water worm or artificial diet on the growth and body color of grass goldfish,grass goldfish with initial weight of(7.82±1.84)g and body length of(5.73±0.45)cm were selected and fed with water worm(SY group)and arti-ficial diet(SL group)respectively,and the body weight and body color were measured regularly.The results showed that the weight gain rate and specific growth rate of experimental fish in the SY group were significantly higher than those in the SL group(P<0.05),while the difference in fullness was not significant(P＞0.05).There was no significant difference in the slope of the straight line of body weight between the two groups of experimental fish(P＞0.05).The body color L *(brightness)values of two groups of grass goldfish showed a positive correlation trend with feeding time,while a*(+a*red,-a*green)and b*(+b*yellow,-b*blue)values showed a negative correlation trend.There was no significant difference in the slope(K)of the straight line of the chromaticity values between the two groups of experimental fish(P＞0.05).At the end of the experiment,the surface a*and b*values of the fish in the SY group were significantly higher than those in the SL group(P<0.05).Research had shown that there was a strong linear correlation between the body weight and growth time of grass goldfish.Feeding water worms was more easily accepted by grass goldfish and could stably promote their growth.However,whether feeding water worms or artificial feed,the red color on their body surface would gradually fade.
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维普
