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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
FORAGING ADAPTATION RAINBOW TROUT IN NATURAL STREAM
 BLINKA, Tomáš
Goal of this study was to evaluate content and quantity of nourishment received by rainbow trout in defined time intervals after stocking to experimental segment of the Blanice river. Determine how fast the trouts raised in artificial breeding will adapt to biotic and abiotic factors in the stream and start ingesting in higher amount their natural nourishment. Rainbow trouts (SL= 266 ? 14 mm, m= 347 ? 54 g) were stocked in number of about a hundred of specimens into three segments of the river Blanice. These segments were connected and the fish were caught by agregat in beforehand determinated intervals. The nourishment of caught fish was analysed afterwards. We discovered that the fish started hunting after their natural prey nearly immediately after stocking. Natural nourishment were in the same amount as in the original fish as soon as three days after stocking. The nourishment of the fish in all monitored period was primarily composed of bentic organisms, according to index of preponderance (%) it was consisted of Caddisflies (Trichoptera) 24%, Mayflies (Ephemeroptera) 19% and the secondary element was composed of bigger terrestric prey as gastropods (Gastropoda) 25%, which got into the stream with rainfall water.
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