ICHTHIOFAUNA OF A PART OF THE RIVER SAVA

Radi utvrđivanja stanja ribljeg fonda u Savi prije gradnje NE Krško kako bi se ustanovile posljedice njezina djelovanja obavljena su trogodišnja istraživanja (1978 - 1980. g.) dijela rijeke od Krškog do Podsuseda. Istraživanja su obuhvatila ulov riba raznim ribolovnim alatima, sezonski i pri različitim vodostajima te njihovu ihtiološku obradu. Utvrđeni su kvalitativni i kvantitativni sastav ihtiopo-pulacija, neke značajke mješovitih ihtiopopulacija, prehrana riba te ihtioproduktivnost ovoga područja. Do gradnje brane na Savi i do početka rada NE Krško ovo je područje bilo bogato raznim sastavom mješovitih ihtiopopulacija, pa je tako ovdje bilo naseljeno 29 raznih vrsta riba koje pripadaju u devet porodica. Dominantna je vrsta po brojnosti, ihtiomasi i prirastu je klen (Leucis-cus cephalus L). Istraživano područje naseljavaju ribe prijelazno-nizinskog tipa otvorenih voda, odnosno pripada tipičnoj regiji mrene sa svim pratećim ribama. Nažalost, danas nakon izgradnje i djelovanja rada NE Krško, u monitoring istraživanja ovog dijela Save nisu uključena i ihtiološka istraživanja, što bi, svakako, bilo korisno poduzeti, s obzirom na mogućnost utjecaja toplinske, radiološke i druge populacije na riblji fond.The fish community in the River Sava, from Krško to Podsused, was investigated over a three-year period from 1978 - 1980, before the construction of the Nuclear Power Plant (NPP) Krško to determine its influence effects. Investigations included the catch structure of fish with various tools, in different seasons, at different water levels, as well as their ichthiological evaluation. The qualitative and quantitative components of the ichthiopopulation were determined, as well as the significance of some mixed ichthiopopulations, the fish diet and the ichthioproduction of this region. Up until the construction of the dam on the Sava and the beginning of work on the NPP Krško, this region had been rich in different components of mixed ichthiopopulations, which included 29 different species of fish, belonging to 9 families. The dominant species by number, ichthiomass and growth rate is the chub (Leuciscus cephalusu L). The investigated area is inhabited by transitory, lowland types of fish of open waters, that is, they belong to the typical region of the barbel with all the accompanying fish. Unfortunately, today after the building and operation of the NPP Krško, in monitoring studies of this part of the River Sava no ichthiological investigations are included, which would certainly be useful to undertake, considering the possibilities of the influence of thermal radiological and other influence on fish populations