scholarly journals Fast-start muscle dynamics in the rainbow trout Oncorhynchus mykiss: phase relationship of white muscle shortening and body curvature

2005 ◽  
Vol 208 (5) ◽  
pp. 929-938 ◽  
Author(s):  
J. A. Goldbogen
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
White Muscle ◽  
Phase Relationship ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Muscle Dynamics ◽  
Muscle Shortening ◽  
Fast Start ◽  
Relationship Of

RNA/DNA ratios in white muscle as estimates of growth in rainbow trout held at different temperatures

1990 ◽  
Vol 68 (7) ◽  
pp. 1494-1498 ◽  
Author(s):  
Moira M. Ferguson ◽  
Roy G. Danzmann
Keyword(s):  
Growth Rate ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
White Muscle ◽  
Specific Growth ◽  
Fish Size ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Different Temperatures ◽  
Specific Growth Rates ◽  
Rna And Dna

The concentrations of RNA, DNA, and protein in white muscle from 240 uniquely tagged rainbow trout (Oncorhynchus mykiss) held at three temperatures (5, 8 (control), and 11 °C) were measured. Both RNA and RNA/DNA ratios were better predictors of recent length- and weight-specific growth rates than they were of absolute fish size. Furthermore, RNA concentrations were better predictors of growth than RNA/DNA ratios. The strength of the regression between either RNA/DNA ratio or RNA and growth rate did not differ consistently among temperatures. Fish reared at warmer temperatures had lower concentrations of RNA for both a given growth rate and a given DNA concentration compared with cold-reared trout. Warm-reared fish also had lower concentrations of DNA and higher protein/DNA ratios than cold-reared trout when fish size was standardized. The concomitant decrease in both RNA and DNA concentrations resulted in marginally lower RNA/DNA ratios in warm-reared fish.

Sprint-training effects on trout (Oncorhynchus mykiss) white muscle structure

1991 ◽  
Vol 69 (11) ◽  
pp. 2786-2790 ◽  
Author(s):  
A. Kurt Gamperl ◽  
E. Don Stevens
Keyword(s):  
Oncorhynchus Mykiss ◽  
Endurance Training ◽  
Muscle Fiber ◽  
White Muscle ◽  
Fiber Type ◽  
Volume Density ◽  
Sprint Training ◽  
Cross Sectional ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Fast Start

In mammals, sprint-type exercise protocols induce muscular adaptation different from that caused by endurance training. Although there are many published studies on endurance training in fish, few have examined sprint (anaerobic) training. This study is an examination of whether sprint-training changes white muscle morphology in addition to its previously shown ability to improve trout fast-start acceleration performance. Rainbow trout (Oncorhynchus mykiss) white muscle was sampled following 4, 8, and 12 weeks of sprint training (30 s duration, every 2nd day). White muscle fiber cross-sectional area and perimeter were unchanged by the sprint-training regimen. The volume density of terminal cisternae, T-tubules, mitochondria, and lipid droplets were also not significantly different following training. A formula relating muscle fiber perimeter and area, derived from trout white muscle, appears to describe accurately the perimeter–area relationship for muscle fibers, regardless of species or fiber type.

Metabolic effects of the expression of a phosphoglucomutase locus in the liver of rainbow trout

1990 ◽  
Vol 68 (7) ◽  
pp. 1499-1504
Author(s):  
Moira M. Ferguson ◽  
Roy G. Danzmann ◽  
Fred W. Allendorf ◽  
Kathy L. Knudsen
Keyword(s):  
Oxygen Consumption ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
White Muscle ◽  
Metabolic Effects ◽  
Parallel Analysis ◽  
Separate Experiment ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Consumption Rates ◽  
Sib Families

We examined the lengths, weights, condition factors, and hepatosomatic indices of juvenile rainbow trout (Oncorhynchus mykiss) from four full-sib families, each segregating at the temporal regulatory locus Pgm1-t, and the concentrations of RNA, DNA, and protein in their livers and white muscle. In three families, fish with phosphoglucomutase-1 (PGM1) activity in liver (Pgm1-t(b) fish) are significantly longer than their full-sibs lacking activity for liver PGM1 (Pgm1-t(a) fish). Hepatosomatic indices tend to be higher in the Pgm1-t(b) fish than in their Pgm1-t(a) siblings. RNA/DNA ratios in the liver of Pgm1-t(b) fish are significantly higher than those of Pgm1-t(a) fish in two families and marginal in a third. However, no significant differences were detected in a parallel analysis of nucleic acids and protein in white muscle, where PGM1 is expressed in all fish. In a separate experiment, Pgm1-t(b) fish were significantly heavier in all five families, had significantly higher condition factors in two families, and had marginally lower standardized oxygen consumption rates in three families.

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