Prevention of Flavobacterium psychrophilum Vertical Transmission by Iodophor Treatment of Unfertilized Eggs in Salmonids

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  • Kumagai Akira
    Miyagi Prefecture Fisheries Technology Institute
  • Nawata Akatsuki
    Miyagi Prefecture Fisheries Technology Institute Freshwater Fisheries Experimental Station

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Other Title
  • サケ科魚類未受精卵のヨード剤消毒による冷水病菌の垂直感染の防除
  • Prevention of Flavobacterium psychrophilum vertical transmission by lodophor treatment of unfertilized eggs in salmonids

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Abstract

We evaluated the efficacy of povidone-iodine treatments in preventing vertical transmission of Flavobacterium psychrophilum in the eggs of masu salmon Oncorhynchus masou, Japanese char Salvelinus pluvius, coho salmon O. kisutch and rainbow trout O. mykiss. When newly spawned eggs were immersion-challenged with F. psychrophilum (> 109 CFU/mL) and subsequently disinfected with povidone-iodine (50 ppm in PBS, 15 min) prior to fertilization, the pathogen was not detected in the contents of the eggs. Without this pre-fertilization disinfection with povidone-iodine, however, procedures such as water-hardening of immersion-challenged eggs in povidone-iodine (50-100 ppm in water) and rinsing of the F. psychrophilum-contaminated eggs with PBS were insufficient to control the intra-ovum infection. In a separate experiment using coho salmon eggs challenged with F. psychrophilum, pre-fertilization disinfection was effective to prevent bacterial cold-water disease in the produced fry. Surface disinfection of unfertilized eggs immediately after spawning is thus essential to prevent vertical transmission of F. psychrophilum.

Journal

  • Fish Pathology

    Fish Pathology 45 (4), 164-168, 2010

    The Japanese Society of Fish Pathology

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