Extensive culture of burbot (Lota lota maculosa) Jimmy Barron 1.
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Transcript of Extensive culture of burbot (Lota lota maculosa) Jimmy Barron 1.
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Extensive culture of burbot (Lota lota maculosa)
Jimmy Barron 1
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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.
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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.
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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).
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Results
• No survival from the 15d and 30d stocking times.
• 22 individuals harvested from the 45d stocking.
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-FW rotifers stocked
-Ceriodaphnia dubia Stocked
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-Daphnia magna stocked
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Harvest
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45 d on live feed treatment burbot raised intensivelyMean endpoint mass(g) 5.6 0.4Mean endpoint length(mm) 98.8 31.5% growth(mm/month) 405% 119%growth(g/month) 1.55 0.381N 22 0% survival at 108d post stocking 0.22% 0%
45d treatment Intensive culture
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Burbot mass
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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.
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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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