Winthrop National Fish Hatchery

Directions:

As you drive along State Highway 20 to Winthrop, look for Twin Lakes Road on the east end of town and follow the signs to the Hatchery. Come on in for a visit!

Winthrop's Update :

Spring Chinook Salmon

Brood Year 2006

Although BKD-related mortalities increased by 1,400 fish from last month’s reporting, overall this group continued to do very well.  A fifth BKD-infected pond was identified towards the end of the month, which brought the totals up to two ponds in C-bank, one in D-bank, and two in E-bank.  Hatchery staff took length samples during the monthly fish sampling conducted on the 28th, which revealed a population with a condition factor of 4.60 and an average length of 110 millimeters (N = 281; SD = 7.88; SE = 0.47; CV = 7.13%).  The water source for this lot was 50% river water and 50% ground water.

Olympia fish Heath Center reported good overall health. Overall mortality continued to remain low on this group of fish. Hatchery staff took length samples during the monthly fish sampling conducted on the 28th, which revealed an average length of 110 mm / 4.33 in.  The water source for this lot was 50% river water and 50% ground water.           

Total juvenile spring Chinook salmon on station: 524,381

Alevin

Approximately 490,000 alevin remain in incubation trays awaiting their transfer to early-rearing tanks sometime December. 

Coho Salmon

Brood Year 2006

Due to colder water temperatures last month, the feeding was enhanced. The result was a large jump in size. Mortality remained very low overall. Length samples taken during the monthly fish sampling on the 27th identified a population with a mean length of 110 mm / 4.33 in. The water source for this lot was 60% river water and 40% ground water.

Total juvenile Coho salmon on station: 266,749

Adults/Eggs

The final two spawning sessions of the year were conducted on the 7th and 14th of the month, which brought the grand total to 268 females spawned, producing an estimated 640,000 green eggs.  A total of 942 adults were spawned and 361 excess were returned to the river.

Steelhead Trout

Brood Year 2007

This population is doing very well. Length samples taken on the 29th determined the population to have an average length of 125 mm / 4.9 in.  The water source for this lot was 100% ground water.

Total juvenile Steelhead on station: 118,970