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Rainbow trout display a developmental shift in red muscle kinetics, swimming kinematics and myosin heavy chain isoform
Author(s) -
Coughlin D. J.,
Burdick J.,
Stauffer K. A.,
Weaver F. E.
Publication year - 2001
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2001.tb00523.x
Subject(s) - rainbow trout , biology , myosin , contraction (grammar) , muscle contraction , trout , gene isoform , kinetics , anatomy , kinematics , biophysics , fish <actinopterygii> , medicine , endocrinology , fishery , biochemistry , physics , gene , quantum mechanics , classical mechanics
Both activation and relaxation times of rainbow trout Oncorhynchus mykiss red muscle were shorter in parr than in older juveniles. Furthermore, parr red muscle had a faster maximum shortening velocity than that of older fish, as estimated with the force‐clamp technique. Parr swam with higher tailbeat frequencies and lower tailbeat amplitude than did older fish across a range of length‐specific steady swimming speeds. The developmental shift in contraction kinetics of red muscle and steady swimming kinematics was associated with a reduction from two or three myosin heavy chain isoforms in parr to one in older juveniles. This transition provides a mechanism to explain the variations in muscle contraction kinetics and swimming performance.