I.B. Pagu

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RESEARCH REGARDING VARIATION OF MUSCULAR FIBRE DIAMETER AT RAINBOW TROUT DIFFERENTIALY FEED

I.B. Pagu, C.E. Nistor, E. Măgdici, G.V. Hoha, A.C. Barbacariu, C. Polenschi, B. Păsărin

Abstract
    Salmons' muscles are divided in myotomes assembled under form of letter W, delimited by myoseptes, which allow the muscular fibres to insert on bones. Orientation of muscular fibres in myotomes is complex and varies on all fish length function of the distance from vertebral column. To achieve the goals of the current paper were analysed lateral musculature, hypaxial and epaxial, for a number of 60 individuals of rainbow trout, 20 individuals for each age group (2nd summer, 3rd summer and 4th summer), determining the diameter of muscular fibres and also the density of muscular fibres per square unit. Trout from those six batches are from two salmon farms situated in Neamţ County, and during our research those ones were feed with granulated fodder with different granulation and with different protein level. As a result of cytometric and histometric determinations on musculature gathered from rainbow trout individuals from those six batches were obtained values between 56.82 and 89.20 µ for muscular fibres diameter, respectively between 157.40 and 193.35 m. f./mm2 for density of muscular fibres.

Key words: musculature, rainbow trout, muscular fibres, epaxial, hypaxial