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 » ODFW Home    » Fish Division    » Local Fisheries    » Diamond Lake   » Post-Treatment Monitoring
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Fish FISH DIVISION
Regulating harvest, protection, and enhancement of fish populations
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Diamond Lake Fish Stocking and Harvest Limits

Fish Stocking Strategy

  • Diamond Lake’s fish stocking has fluctuated over the last seven years from a high of 346,000 fingerlings in 2009 to a low of 166,000 in 2012. The reductions were made to try to balance the lake’s fishery and ecosystem according to our Diamond Lake Management Plan.
  • In 2010, algae blooms began occurring again, and ODFW creel data showed that up to a third of the fish caught were released back into the lake. A stocking model was also being used to avoid overstocking the lake.
  • In 2013, it was noted the model was not accounting for natural mortality of trout in the lake. This meant the trout surplus was over-estimated.
  • In late July 2013, creel data was analyzed, confirming that angling was poor. Since there were less surplus trout than expected, ODFW immediately stocked 16,000 legal-sized trout. In November, 20,000 sub-legals were stocked.
  • In 2014, ODFW began a stabilized stocking of 300,000 fingerlings per year.
  • 2015 – ODFW added 3,500 trophy trout and 3,000 legal trout in addition to the 300,000 fingerlings.
  • 2016, ODFW is stocking 300,000 fingerling rainbow trout, 5,000 sterile tiger trout in the six to seven-inch range, and 13,000 sterile tiger trout fingerlings.
  • Stabilized stocking may allow better comparisons between stocking rates, ecological parameters and angler success.

Angler Success

  • 2017: 2.70 rainbow trout/angler
  • 2016: 2.33 rainbow trout/angler
  • 2015: 1.18 rainbow trout/angler
Angler Success
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