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Extensive culture of burbot ( Lota lota maculosa )

Extensive culture of burbot ( Lota lota maculosa ). Jimmy Barron. Objectives. Determine growth, condition, survival and optimal density for the extensive culture of burbot. Determine optimum temperature for growth, condition and survival for burbot transitioned to commercial feed.

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Extensive culture of burbot ( Lota lota maculosa )

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  1. Extensive culture of burbot (Lota lota maculosa) Jimmy Barron

  2. Objectives • Determine growth, condition, survival and optimal density for the extensive culture of burbot. • Determine optimum temperature for growth, condition and survival for burbot transitioned to commercial feed. • Evaluate existing natural ponds based on collaborations with Idaho Fish and Game.

  3. 2008 extensive culture preliminary observations • Six 12’ tanks, sunken into the ground were assigned to one of three treatments. • Treatments were stocking time: 15 days on live feed(rotifers only), 30 days on live feed(rotifers only) and 45 days on live feeds(rotifers and artemia). • 5000 larvae counted and stocked per tank.

  4. Intermediate data collection • Water quality tested weekly. • Traps used to check for survival. • Lengths and weights recorded from trapped burbot. • Zooplankton sampling conducted weekly(beginning July 22).

  5. Results • No survival from the 15d and 30d stocking times. • 22 individuals harvested from the 45d stocking.

  6. -FW rotifers stocked -Ceriodaphnia dubia Stocked

  7. -Daphnia magna stocked

  8. Harvest 45d treatment Intensive culture

  9. Burbot mass

  10. Main points • Survival only found in tanks stocked with larvae fed for 45 days on rotifers and artemia. Survival of 0.22% • Burbot raised extensively had higher growth rates and survival than those raised intensively. • Burbot density(d) was 5000burbot/6300L = .8 burbot per liter. • At this stocking density in the proposed 10mx10mx2m experimental ponds(200,000L): 160k larvae(45days after first feeding) per pond would be needed, and the estimated harvest(0.22%survival) would be 352 juveniles per pond. • This preliminary trial indicates that burbot can be successfully reared under these specific extensive conditions.

  11. Direction for 2009 • Stock at 45d post 1st feeding • Use density as the treatment. • Divide ponds in some way, thus increasing the # of treatments and replicates. • Seed zooplankton first with freshwater copepods and at a later time Daphnia magna.

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