Food is one of the most important items in fish culture economy. Juvenile fish prove the fastest growth rates and that is the reason why their appropriate nourishment is so important. Surface drift of terrestrial insects provides an excellent food for rheophilic fish species . Reophilic fishes are able to utilise also plants and particularly algae too. Terrestrial insects can be attracted to water surface by various ways. Is it a light trap during the night. The installation of colour traps is another possibility of insect enticement, for example when located several centimetres bellow the water. We can use various coloured traps {--} yellow, red, blue and other. Light is very attractive for night insects, killing them by electricity. Insects which fall down to water provide an excellent complementary food sources. The experiments were performed with young chub (Leuciscus cephalus). Coloured traps (yellow and red), raffia mats supproting algal growth and electric insect killer were tested. No-trap tanks served as a control. The experiment was run for two growing seasons.. As compared to control, the variants provided with coloured traps proved significantly better results regarding fish growth and condition. However, the best results were achieved using the light trap. Basing on the study results, it can be concluded, that the traps can contribute to successful breeding of juveniles of reophilic fish.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:48872 |
| Date | January 2008 |
| Creators | HERCIG, Daniel |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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