Histochemical characterization of myotomal muscle in the grass pickerel, <i>Esox americanus vermiculatus</i> (LeSeuer), and the muskellunge, <i>E. masquinongy</i> (Mitchell)

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<jats:p>A histochemical study of the myotomal muscles in the grass pickerel, <jats:italic>Esox americanus vermiculatus</jats:italic>, and the muskellunge, <jats:italic>E. masquinongy</jats:italic>, was performed using actomyosin ATPase and NADH diaphorase activities. Three fibre types, i.e., red, white and pink were distinguished on the basis of their enzyme activities. White muscle fibres comprised the bulk of the myotomal musculature. The relative proportion of red muscle fibres was greater in the caudal region than in more anterior regions of the body. Pink fibres formed only a few layers between red and white. These findings are discussed in relation to the possible functional significance of the muscle fibre types in swimming and feeding behaviour in these species.</jats:p>

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