A novel experiment of rearing burbot larvae in cages
Identifieur interne : 000362 ( Main/Exploration ); précédent : 000361; suivant : 000363A novel experiment of rearing burbot larvae in cages
Auteurs : V. L. Paragamian [États-Unis] ; C. Laude [États-Unis] ; K. D. Cain [États-Unis] ; J. M. Barron [États-Unis] ; N. R. Jensen [États-Unis]Source :
- Journal of Applied Ichthyology [ 0175-8659 ] ; 2011-09.
Abstract
Feeding burbot Lota lota maculosa larvae were released in pens deployed in two ponds of the Kootenai River, Idaho, USA drainage: one pond each in 2008 through 2010. The objectives were to compare results of survival, growth, and the practicality of pen rearing burbot. In 2008 we stocked two pens at low density with 30 burbot larvae each (20 larvae per m3) and collected a total of 47 of the 60 after about 70 days, for an estimated average pen survival of 78%. Average length in August 2008 was 48 mm total length. Yellow perch Perca flavescens were discovered in the pond. The pond was drained in December of 2008 to eradicate the yellow perch. In 2009 a total of 467 feeding burbot larvae were placed between five pens at three densities of about 18, 39, 95 burbot larvae per m3. By September, average TL of burbot was 49 mm. Growth appeared to slow for all stocking densities after the fifth week. Average survival for burbot from initial pen stocking to final recovery was 18%. Best survival was at the two lower densities. In 2010 stocking was moved to a second pond and a total of 484 feeding burbot larvae were placed between five pens at the three densities. In 2010 burbot were supplementally fed. Average survival for the low, moderate, and high density pens was 86, 78, and 20%, respectively. Mean TL at collection in 2010 for the low, moderate and high densities were 37, 37, and 40 mm, respectively. Food availability was believed to be a limiting factor to survival because adding zooplankton appeared to improve survival.
Url:
DOI: 10.1111/j.1439-0426.2011.01838.x
Affiliations:
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The objectives were to compare results of survival, growth, and the practicality of pen rearing burbot. In 2008 we stocked two pens at low density with 30 burbot larvae each (20 larvae per m3) and collected a total of 47 of the 60 after about 70 days, for an estimated average pen survival of 78%. Average length in August 2008 was 48 mm total length. Yellow perch Perca flavescens were discovered in the pond. The pond was drained in December of 2008 to eradicate the yellow perch. In 2009 a total of 467 feeding burbot larvae were placed between five pens at three densities of about 18, 39, 95 burbot larvae per m3. By September, average TL of burbot was 49 mm. Growth appeared to slow for all stocking densities after the fifth week. Average survival for burbot from initial pen stocking to final recovery was 18%. Best survival was at the two lower densities. In 2010 stocking was moved to a second pond and a total of 484 feeding burbot larvae were placed between five pens at the three densities. In 2010 burbot were supplementally fed. Average survival for the low, moderate, and high density pens was 86, 78, and 20%, respectively. Mean TL at collection in 2010 for the low, moderate and high densities were 37, 37, and 40 mm, respectively. Food availability was believed to be a limiting factor to survival because adding zooplankton appeared to improve survival.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Idaho</li></region></list><tree><country name="États-Unis"><region name="Idaho"><name sortKey="Paragamian, V L" sort="Paragamian, V L" uniqKey="Paragamian V" first="V. L." last="Paragamian">V. L. Paragamian</name></region><name sortKey="Barron, J M" sort="Barron, J M" uniqKey="Barron J" first="J. M." last="Barron">J. M. Barron</name><name sortKey="Cain, K D" sort="Cain, K D" uniqKey="Cain K" first="K. D." last="Cain">K. D. Cain</name><name sortKey="Jensen, N R" sort="Jensen, N R" uniqKey="Jensen N" first="N. R." last="Jensen">N. R. Jensen</name><name sortKey="Laude, C" sort="Laude, C" uniqKey="Laude C" first="C." last="Laude">C. Laude</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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