两种增色剂对阿里雌鱼生长及体色调控的研究

Effects of Androstenedione and Testosteroneon on Growth and Body Pigmentation of Female Sciaenochromis Fryeri

为探索饲料中添加雄烯二酮和睾酮对阿里雌鱼生长及体色的影响,将810尾初始体质量为5.78±1.05 g的阿里雌鱼随机分为9组,每组3个平行,每个平行30尾鱼,对照组投喂基础饲料,试验组分别投喂含100,200,300,400 mg/kg雄烯二酮(A100,A200,A300,A400组)和100,200,300,400 mg/kg睾酮(T100,T200,T300,T400组)8个浓度梯度的饲料.观察8周增色时间和4周停药期鱼的生长及体色变化情况.结果显示:不同浓度的雄烯二酮和睾酮对阿里雌鱼的成活率没有影响,均为100%.A200组的阿里雌鱼特定生长率(SGR)最高,为0.39,显著高于T100,T200,T400组和对照组(p<0.05).8周增色后,A300组的阿里雌鱼体色总色差值(△E*ab)、黄蓝度值(b*)与A400,T300组差异无统计学意义(p>0.05),但均小于其他各组(p<0.05);在后4周停药期中,体色呈现先增艳后又缓慢减弱的现象,仍维持在体色较艳的程度.结果表明,饲料中添加雄烯二酮比睾酮更有效地促进了阿里雌鱼的生长和增色,A300,A400组增色后的阿里雌鱼体色能够稳定4周,阿里雌鱼适宜增色剂及添加量为雄烯二酮300 mg/kg.

In order to study on the effects of androstenedione and testosterone on growth and body colour in female Sciaenochromis fryeri.Eight hundred and ten fishes with initial body weight of 5.78±1.05 g were randomly divided into 9 groups,the experiment groups fed the diets containing Androstenedione(100,200,300,400 mg/kg)and testosteronetested(100,200,300,400 mg/kg)respectively for 8 weeks,the control group fed the basal diet without any color enhancer.After 8 weeks,all fishes were fed the control diet for 4 weeks.Growth performance and body pigmentation of female Sciaenochromis fryeri were determined every 2 weeks during the 12 weeks experimental period.The results showed that the average survival rate of each group of female Sciaenochromis fryeri was 100%,the fish fed the experimental diets containing androstenedione and testosterone had significantly higher the specific growth rate(SGR)compared with the fish in control group,and the highest SGR was A200 group 0.39,which was significantly higher than that of T100,T200,T400 and control groups(p<0.05).The color aberration(△E*ab)and b*value of A300 group was not significantly diffence with the A400 and T300 group(p>0.05),but which were significantly lower than other groups(p<0.05).After enhancing the colouration of female Sciaenochromis fryeri for 8 weeks,the fish colour of A300 and A400 groups were raised somewhat,and then decreased slightly,the fish colour was remained at stable level constantly.The experiments indicated that the average growth and pigmentation performance of androstenedione were better than that of testosterone's(p<0.05),and the optimal recipe was androstenedione 300 mg/kg.