养殖水位对2龄黄喉拟水龟生长性能的影响

Effect of Culture Water Levels on Growth in 2-Year-Old Asian Yellow Pond Turtle Mauremys mutica

为提倡节水养殖,探索不同节水养殖水位对黄喉拟水龟生长性能的影响,以2龄黄喉拟水龟为试验对象,水温20.7~30.1℃时,采取单盒饲养法,设置350mL(高水位)、260mL(中水位)、110mL(低水位)3个不同养殖水位,饲养7个月后测定生长指标和形态性状。试验结果表明,260mL水位和350mL水位组龟体质量显著高于110mL水位组(P<0.05);260mL水位和350mL水位组龟背甲长、背甲高、腹甲长和甲桥长在试验后期均显著高于110mL水位组(P<0.05),背甲宽显著小于110 mL水位组(P<0.05);260mL水位组和350mL水位组的扁平度在影响效果上显著低于110mL水位组(P<0.05)。由此可见,采用110mL水位养殖黄喉拟水龟显著影响受试龟的体质量、形态性状和扁平度,宏观显现缺水情况下龟体生长适应调节机制,具有显著的节水效能;260mL水位组兼顾了节水效能和生长优势;350mL水位组仅具有显著的生长优势。从生长性能和节水效能角度考虑得出,260 mL养殖水位是黄喉拟水龟节水养殖的适宜水平。

In order to promote water-saving aquaculture,the effects of three aquaculture water levels on the growth of 2-year-old Asian yellow pond turtle Mauremys mutica were investigated.One turtle was reared in a box(16.9 cm×10.5 cm×7.4 cm),30 animals in each water level group including 1 control group and 2 test groups,which were 350 mL(high water level),260 mL(medium water level),and 110 mL(low water level).Under the same conditions of feeding and management,the growth index and morphological characteristics were measured after 7 months at water temperature of 20.7—30.1℃.The results showed that the body weight was significantly higher in turtle in the middle and high water levels than that in the low water level(P<0.05).Turtle carapace length,carapace height,plastron length and carapace bridge length were significantly higher in the high and middle water levels than those in the low water level at the later stage of the test(P<0.05).The final carapace width of the turtles was significantly lower in the high water level test group than that in the low water level test group(P<0.05).The flatness of the middle and high water level groups was shown to be significantly lower than that in the low water level group(P<0.05).In this article,low water level significantly affected the weight,traits and body shape of the tested turtles,while the medium water level did not significantly affect the weight,traits and body shape of the tested turtles.It can be seen that the low water level significantly affects the body weight,morphological characteristics and flatness index of the tested turtles.The low water level group can macroscopically showed the adjustment mechanism of the turtle′s body growth in the absence of water,which had a significant water-saving effect.The mid-water level group was considered to be both water-saving efficiency and growth advantages.There was only significant growth advantages in high water level group.After comprehensive consideration of perspective of growth performance and water saving efficiency,it is concluded that the middle water level is suitable for water-saving aquaculture of the Asian yellow pond turtle.