Experimental evidence on prevention of infection by the ectoparasitic protozoans Ichthyobodo salmonis and Trichodina truttae in juvenile chum salmon using ultraviolet disinfection of rearing water
Experimental evidence on prevention of infection by the ectoparasitic protozoans Ichthyobodo salmonis and Trichodina truttae in juvenile chum salmon using ultraviolet disinfection of rearing water
复制标题
养殖水体紫外线消毒预防幼鲑外寄生原虫鲑鱼和特鲁塔车轮虫感染的实验证据
DOI：
10.1111/jfd.12920
复制
发表时间：
2019
影响因子：
2.5
通讯作者：
Hiroshi Ueda
中科院分区：
文献类型：
--
作者：
Shinya Mizuno;Shigehiko Urawa;Mahito Miyamoto;Makoto Hatakeyama;Nobuhisa Koide;Hiroshi Ueda
在日本北部，幼鲑从孵化场释放，以增加渔业资源。体外寄生原生动物的感染，特别是鞭毛鱼鲑和纤毛毛菌，偶尔会导致孵化场饲养的幼鱼严重死亡。本研究考察了这两种寄生虫对大范围紫外线照射的敏感性（实验1），然后研究了在28天的时间内，使用商业设备对养殖水进行紫外线消毒是否有助于预防小规模养殖系统中幼鱼的感染（实验2）。实验1中，当紫外线照射剂量≥9.60 × 105μW s/cm2forI时，寄生虫死亡率达到100%。≥8.40 × 105μW s/cm2forT。truttae。实验2，在2.2 × 106μW s/cm2的紫外照射下对养殖水进行消毒，成功地完全预防了鲑鱼幼鱼体内的这两种寄生虫。这些结果阐明了紫外辐照灭活ofI的最小剂量。salmonisandT。并证明了使用商用紫外线照射装置对水进行消毒的有效性，以防止孵化场饲养的幼鲑鱼被这些寄生虫感染。
In northern Japan, juvenile chum salmonOncorhynchus keta(Walbaum) are released from hatcheries to enhance the fishery resource. Infections with ectoparasitic protozoans, particularly the flagellateIchthyobodo salmonisand the ciliateTrichodina truttae, occasionally cause severe mortality among hatchery‐reared juveniles. This study examined the susceptibility of the two parasites to wide‐ranging UV irradiation (experiment 1) and then investigated whether UV disinfection of the rearing water using a commercial device was useful for preventing infections among juveniles in a small‐scale rearing system over a 28‐day period (experiment 2). In experiment 1, parasite mortality reached 100% with UV irradiation doses of ≥9.60 × 105μW s/cm2forI. salmonisand ≥8.40 × 105μW s/cm2forT. truttae. In experiment 2, disinfection of the rearing water at a UV irradiation dose of 2.2 × 106μW s/cm2succeeded in complete prevention of both parasites in the juvenile salmon. These results elucidate the minimum dose of UV irradiation for inactivation ofI. salmonisandT. truttae, and demonstrate the usefulness of water disinfection using a commercial UV irradiation device to prevent infections by these parasites in hatchery‐reared juvenile chum salmon.