The Vipava River fishing district starts at the dam in Kasovlje and ends at the national border with Italy. It is divided into three parts: salmonid, miscellaneous and cyprinid.
The first part (salmonid) is the home of marble trout, brown trout, rainbow trout, grayling and hybrids.
The second part (miscellaneous) is the home of salmonids and cyprinids.
The third part (cyprinid) is the populated by wels catfish, tench, barbel, grass carp, carp, north-Adriatic chub, Danubian nase, pike, eel, …

Daily catch limit: The daily catch limit is three salmonids, of which no more than one can be a rainbow trout over 50 cm, one grayling over 35 cm and one hybrid over 45 cm.