Rrehabilitation of rivers for cyprinid species of fish

Šneller, Denis (2009) Rrehabilitation of rivers for cyprinid species of fish. Bachelor's thesis, Faculty of Science > Department of Biology.

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Habirat requirements of fish have to be considered in any effort to maintain or rehabilitate rivers for fish biodiversity. As a general rule, habitat requirements are satisfied by complex habitat structure and biological conectivity. At each specific site, the fish communitiy structure of a river depends on the integritiy on the longitudinal connectivity of the system. The habitat requirements for different fish species, but also for different for different stages in the life cycle of any one species, are quite divergent. To survive, stream and river dwelling species undergo complex cycles of dispersion and migration. They migrate between three major habitats: wintering habitat; feeding habitat; and spawning habitat (Slika 2.). A need for understanding the specific requirements and the biological connectivity is important for developing a habitat – centred view of fish communities. In this context, a functional unit includes spawning, feednig, nursery (growth) and resting (self protection) areas (Slika 1.), each of which is linked in various ways with environmental features. Complex habitat structure is provoded by intensive interactions between the river channel and its adjacent environment. Coarse woody debis creates and maintains microhabitat and areas of reduced stream velocitiy that serve as shelter which is essential to fish during winter and high flow situations. The complex habitat structure is very important, and has broad influence on cyprinids and other genera of coarse fish.

Item Type: Thesis (Bachelor's thesis)
Supervisor: Mrakovčić, Milorad
Date: 2009
Number of Pages: 18
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 18 Dec 2014 10:35
Last Modified: 18 Dec 2014 10:35
URI: http://digre.pmf.unizg.hr/id/eprint/3541

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