title: Antiparasitic effect of calcium and magnesium ion-free buffer treatments against a common monogenean Neobenedenia girellae.
abstract: This study investigated a new effective method for controlling the capsalid monogenean Neobenedenia girellae. We examined in vitro and in vivo the effect on the percentage survival of N. girellae in buffers containing different metallic ions. Decreased survival was observed in buffer solutions lacking two ions. In particular, the percentage survival of N. girellae was significantly decreased after 10 min exposure to buffer containing neither Ca(2+) nor Mg(2+). Transmission electron microscopic observations showed that treatment with this buffer disrupted intercellular junctions. This significant effect on percentage survival of N. girellae using Ca(2+)/Mg(2+)-free buffer was confirmed in an in vivo assay. Ca(2+)/Mg(2+)-free buffer had no effect on the condition of the host, spotted halibut Verasper variegates (Pleuronectidae). These results suggest that treatment with Ca(2+)/Mg(2+)-free buffer is a new effective control method, which could replace existing control methods.
authors.affiliation: Laboratory of Fish Reproductive Physiology, Faculty of Agriculture, Ehime University, Matsuyama, Ehime 790-8566, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Ohashi
authors.forename: N
authors.initials: N
authors.lastname: Umeda
authors.forename: N
authors.initials: N
authors.lastname: Hirazawa
authors.forename: Y
authors.initials: Y
authors.lastname: Ozaki
authors.forename: C
authors.initials: C
authors.lastname: Miura
authors.forename: T
authors.initials: T
authors.lastname: Miura
mesh_terms: D000818:Animals; D002118:Calcium / Q000502:physiology*; D005393:Fish Diseases / Q000517:prevention & control; D005432:Flounder / Q000469:parasitology*; D007365:Intercellular Junctions / Q000502:physiology*; D008274:Magnesium / Q000502:physiology*; D046529:Microscopy, Electron, Transmission / Q000662:veterinary; D010572:Pest Control, Biological; D013997:Time Factors; D014200:Trematoda / Q000254:growth & development* / Q000648:ultrastructure*; D014201:Trematode Infections / Q000517:prevention & control / Q000662:veterinary
chemical_list: D008274:Magnesium; D002118:Calcium