鲮鱼和二代混精鲮鱼低温耐受能力的差异

THE DIFFERENCE IN LOW TEMPERATURE ENDURANCE BETWEEN MUD CARP AND MIXED SPERM INSEMINATED MUD CARP OF THE SECOND SUCCESSIVE GENERATION

采用LKB循环冷却装置以程序降温方式比较鲮鱼及二代混精鲮鱼(草鱼混精鲮或多精混精鲮再用草鱼精液进行混精受精所得子代)的耐寒性能。无论是在7.0℃条件下的耐受时间,还是对低温耐受的极限,二代混精鲮鱼均优于鲮鱼,但这种改善是有限的。作者认为,混精受精法不能从根本上解决鲮鱼的不耐寒性能。应该寻求其他更有效的育种途径。

By lowering the water temperature progressively with an LKB thermostatic circulator, we studied comparatively the low temperature tolerance of mud carp (Cirrhina molitorella)and mixed sperm (from grass carp and mud carp or from grass carp silver carp, red common carp and mud carp) inseminated mud carp of the second successive generation. The mixed sperm inseminated mud carp of the successive generation were more tolerant of low temperature than mud carp both in terms of the enduring time at 7℃ and of the low temperature limits for shock and death. However, the improvement is rather limited. We proposed, therefore, the mixed sperm insemination method is unable to improve the mud carp's low temperature endurance below 6℃ and other breeding methods must be explored in order to improve the cold tolerance of this fish more effectively.