Fifteen Years without an IHN Outbreak at Lyons Ferry Hatchery … Just Good Luck? Steve Roberts Fish Health Specialist March 2008.

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Presentation transcript:

Fifteen Years without an IHN Outbreak at Lyons Ferry Hatchery … Just Good Luck? Steve Roberts Fish Health Specialist March 2008

Overview  Background – Hatchery & Steelhead Stocks  IHN Outbreaks  IHN Virus Management  Outcome

 Water source – wells  Four stocks of steelhead reared  Also - fall chinook, spring chinook and rainbow trout Lyons Ferry Hatchery

Steelhead stocks  Lyons Ferry stock – adults collected at LFH … 345 K smolts/year  Wallowa stock – adults collected at Cottonwood AP … 160 K smolts/year  Touchet endemic stock – adults collected at Dayton AP … 50 K smolts/year  Tucannon endemic stock – adults collected at 2 sites on Tucannon river … 50 K smolts/year

1989 IHN Outbreak  Initial mortality in newly feeding steelhead in hatchery building  Later spread to other steelhead and rainbow in outside raceways  Resulted in the destruction of 967 K fish and disinfection of north hatchery and raceways

1992 IHN Outbreak  Outbreak confined to newly feeding steelhead in hatchery building  No spread to other fish  Resulted in the destruction on 372 K steelhead

IHN Virus Management  Testing of all female spawners. Also, quantify level of virus.  Lyons Ferry and Wallowa stocks: Destroy any eggs from females > 10^3 pfu/ml. Segregation rearing if prevalence > 25%  Touchet and Tucannon stocks: Release fry from IHN positive females

IHN Virus Management  Strict equipment disinfection.  Rinsing and water hardening eggs in iodophor.  Isolation egg incubation.  Segregation rearing

Outcome with Lyons Ferry stock  3,037 females tested  IHN virus detected in 5 out of 15 years  In 1995, progeny of 8 IHN+ (< 10^2) females successfully reared  In 1998, progeny of 90 IHN+ (<10^3) females were successfully reared  No IHN Outbreaks in 15 years!

Outcome with Wallowa stock  1,518 females tested  IHN virus detected in 8 out of 16 years  In 1998, progeny of 33 IHN+ (<10^3) females were successfully reared  No IHN Outbreaks in 16 years!

Outcome with Touchet stock  120 females tested  IHN virus detected in 2 out of 8 years  All progeny of IHN positive females were released at fry  No IHN Outbreaks in 8 years!

Outcome with Tucannon stock  100 females tested  No IHN virus detected in 8 years  No IHN Outbreaks in 8 years!

…. or just good luck!!!

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