Title |
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en
Disinfectant Effects of Ultraviolet Irradiation on Fish Pathogens in Hatchery Water Supply
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Creator |
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Accessrights |
open access |
Subject |
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Description |
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Other
en
Second Asian Fisheries Forum. 17-22 April 1989. Tokyo, Japan.
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Abstract
en
Disinfectant effects of U.V. irradiation were examined on cell suspensions of 5 species of fish pathogenic bacteria, and a punched agar medium disk covered with 10 strains of aquatic fungi and 7 strains of cell free fish pathogenic viruses. 99 .99 % or more of the viable bacterial cells were effected by U.V. treatment of more than 2.2 × 10^3 μW•sec/cm2 U.V. dosage. The hyphae of aquatic fungi showed relatively lower susceptibility to U.V. irradiation, that which inhibited the growth of hyphae was 1.5 - 2.5 × 10^5 μW•sec/cm2. Fish viruses, IHNV, HRV, OMV, CCV and H. salmonis were found to be sensitive to U.V. irradiation, and a 99 % or more infectively decrease (ID99) was 1.0 – 3.0 × 10^3 μW•sec/cm2. Susceptibility of IPNV and CSV were found to be low, ID99 measured 1.0 – 1.5 × 10^5 μW•sec/cm2. The infectivity of IHNV, in virus contaminated river water and IHNV contaminated pond water, measured by the molecular filtration method was 0.56 and 5.6 TCID50/l, respectively U.V. treatment of river water with 10^3 μW•sec/cm2 dosage could prevent an IHN outbreak. Furthermore, U.V. treatment of the hatchery water supply also decreases the visible bacterial counts and fungi infection rates of salmonid eggs.
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Publisher |
en
The Asian Fisheries Society
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Date |
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Language |
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Resource Type |
conference paper |
Version Type |
VoR |
Identifier |
HDL
http://hdl.handle.net/2115/38957
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Journal |
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en
The Second Asian Fisheries Forum : proceedings of The Second Asian Fisheries Forum, Tokyo, Japan, 17-22 April 1989
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Page Start643
Page End646
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Conference |
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会議名
en
Asian Fisheries Forum
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回次
2
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開催国
JPN
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開催地
en
Tokyo
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File |
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Oaidate |
2023-07-26 |