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Rasha S.A. AL- Tamimi Mohammed W.H. AL-muhanna Batool A. Hussein

Abstract

The current study included a comparative study related to the life of fish to choose the best species for fish farming, And that is by knowing their motor activity, which is represented by calculating the ratios of red and white muscles in two types of bony fish that belong to the cyprinidae, namely: Luciobarbus xanthopterus (Heckel,1843) and Leuciscus vorax (Heckel,1843) The results of the current study showed a clear difference in the ratios of red and white muscle fibers within the studied length groups and in different areas of the body (R1,R2) Within the same species, the rates of white muscle fibers in the anterior region (R1) were more than the rates of red muscle fibers, where the values of their averages in L. xanthopterus ranged between (12.22-18.32 %), while their average values were (13.37- 17.65 %) in L. vorax, that is, the proportions of red muscle fibers increase towards the caudal peduncle of the fish's body because of its great role in the movement and swimming so the fish of the current study were considered among the group of Sprinter fishes because they contain a high percentage of white muscles of fish.

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Keywords

Luciobarbus xanthopterus (Heckel,1843), Leuciscus vorax (Heckel,1843), muscles, Ratios of red and white muscle fibers.

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