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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.

Rainbow Trout Harvest Limit

  • In 2016, ODFW put the rainbow trout limit back to five legal-sized fish per day with two daily limits in possession and just one trout per day over 20 inches. The rule brings Diamond Lake into consistency with other lakes in the state.
  • A temporary rule allowed an eight fish limit from May 1 – Oct. 27, 2011, and that rule was permanent from 2012-2015.
  • The percent of anglers harvesting eight fish has been:
    • 2011 – 4.78 percent
    • 2012 – 2.76 percent
    • 2013 – 0.81 percent
    • 2014 – 3.38 percent
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