一艘完全无鼠的船舶常因停靠码头,装卸货物或购置给养和船用的物料,给鼠类上船提供了机会。在船舶防鼠设备不完善、饮水和食品充足的情况下,上了船的鼠类便可很快定居下来,并能迅速繁殖,直至酿成严重的鼠患;一艘虽经灭鼠但不甚彻底的船舶,残存鼠凭借其旺盛的繁殖力,使鼠患很快恢复至原来(即灭鼠前)程度。因此,无鼠的或虽经灭鼠,但尚有残存鼠的船只,由于上述二个原因,往往在短期内就可出现鼠患或的鼠数迅速恢复至原有水平。如何使无鼠船只继续保持无鼠。怎样使灭鼠不彻底的船只鼠数不断下降,直至全部消灭并继续保持无鼠,便成了国际航运船舶急待解决的课 A completely rat-free vessel often offers opportunities for rodents to disembark because of docked docks, loading and unloading of cargo, or the purchase of supplies for maintenance and marine purposes. In the ship anti-rat equipment is not perfect, adequate water and food circumstances, on board the rodents will be able to settle down quickly, and can quickly multiply, causing serious rat suffering; one despite rodent but not Very thorough ship, the surviving mouse with its exuberant fecundity, so that rats quickly return to the original (that is, before the anti-rat) level. Therefore, for the two reasons mentioned above, rat-free or rodent-killing vessels are often short-term and the number of rodents or rats is rapidly restored to the original level. How to make no-rodent vessels continue to keep no rats? How to make the rodent incessant decline in the number of rats, until all destroyed and continue to be no rats, it has become an international shipping ship urgent courses