HISTOMORPHOLOGICAL ESTIMATION OF SOME INTERNAL ORGANS OF RAINBOW TROUT ONCORHYNCHUS MYKISS (WALBAUM, 1792) CULTIVATED ON EXPERIMENTAL FEED

Kamila Bolatovna Adyrbekova, Saule Zhangirovna Asylbekova, Saidina Kobegenova, Kuanysh Baibulatovich Isbekov, Saya Kashkinbayevna Koyshibaeva

2017

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DOI 10.24143/2073-5529-2017-4-144-154
Data confidence 70 medium
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Abstract

The article presents histological characteristics of gastrointestinal tract, liver and muscles of the rainbow trout Oncorhynchus mykiss (Walbaum, 1792) juveniles (5 specimens, control group) and yearlings (2 pilot groups, 15 specimens in each group) in the basins of "Chilik pond farm, LLP" (the Almaty region, Kazakhstan) fed with imported Denmark feed "Aller Aqua" and the feed produced by the local company "Kazkorm" (without immunomodulatory probiotic drugs and with immunomodulatory probiotic drug "Biocons", concentration 0.5%). The experiment was devided into 2 series; the first series lasted 45 days (yearlings, 15 specimens), the second series lasted 75 days (yearlings, 15 specimens). The total duration of the experiment made 75 days. In both series there were used 3 variants of feed: in the control group - "Aller Aqua", in pilot groups - feed without and with "Biocons" drug, concentration 0.5%. The histopathological analysis was conducted on termination of the first and second series. The histopathological changes were registered in all studies organs: the minimum changes were observed in the gastrointestinal tract; maximum changes were seen in the liver and somatic muscular system of fish that didn’t take probiotic drug. The intensity of pathological processes grew with duration of taking feeds without probiotic drugs. In the liver of fish there were noted such pathologies as fatty degeneration, enlargement of the liver vessels, cell contact disorders, degradation and necrosis of hepatocytes, violation of the microcirculatory in the form of stasis of blood in the sinusoids. All studied individuals fed with experimental feed were observed with significant pathological changes in the structure of somatic musculature. The size/weight characteristics of fish fed without probiotic drugs were inferior to those in fish using probiotic drugs. The histopathological analysis of indicators of gastro-intestinal tract, liver and muscle, as well as the size/weight characteristics after using feed with probiotic drug showed that the feed can be recommended for practical use, as the feed is the most balanced and nutritious.