Physiological differences between lean and siscowet lake trout morphotypes: Are these metabolotypes?

Results of a past study on lean and siscowet lake trout (Salvelinus namaycush) reared under identical conditions from conception indicated that differences in growth and morphometry between these morphotypes have a genetic basis. Using these cultured lake trout, we found that siscowet lake trout had...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2014-03, Vol.71 (3), p.427-435
Main Authors: GOETZ, Frederick, JASONOWICZ, Andrew, JOHNSON, Ronald, BIGA, Peggy, FISCHER, Greg, SITAR, Shawn
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal reproduction
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Carbohydrates
Energy reserves
Exploitation and management of natural biological resources (hunting, fishing and exploited populations survey, etc.)
Fresh water ecosystems
Freshwater
Fundamental and applied biological sciences. Psychology
Genetics
Lake trout
Lakes
Lipids
Morphology
Morphology (Animals)
Physiological aspects
Salvelinus namaycush
Synecology
Trout
Zoological research
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Summary:Results of a past study on lean and siscowet lake trout (Salvelinus namaycush) reared under identical conditions from conception indicated that differences in growth and morphometry between these morphotypes have a genetic basis. Using these cultured lake trout, we found that siscowet lake trout had higher lipid levels and lower glycogen levels as compared with lean lake trout in skeletal muscle and liver. Lean lake trout also had higher circulating levels of lipids and glucose compared with siscowet lake trout. Analysis of F 1 progeny from crosses of the cultured morphotypes showed that progeny of crosses between siscowet females and siscowet males had higher lipid levels than all other crosses. The combined results indicate that the lake trout morphotypes differ substantially in the storage of energy, which may be related to their specific life histories. Siscowets store energy preferentially as lipid and appear to be more efficient in moving lipid from the blood into the muscle and liver. The lipid in siscowets may be adaptive for regulating buoyancy as well as an essential energy reserve for reproduction.
ISSN:0706-652X
1205-7533
DOI:10.1139/cjfas-2013-0463