The most common species are roach, perch and pike. Other species that can be found are ide, tench, stickleback and burbot. Salmon trout can be found in the River Slafsan, east of the lake.
The common bream used to be plentiful, but it disappeared when the level of the lake was lowered in 1912.
The freshwater crayfish has been introduced to both the River Hornborga and River Flian. The original crayfish has disappeared.
The elk, previously a character species in the forests and bushes around the lake, declined dramatically in conjunction with the restoration and raising of the water level.
On the left side, the occasional red deer can be seen. They originally escaped from enclosed pastures.
Nowadays, beavers are frequently seen in the areas around the lake. There are also large numbers of mink and marten in and around the lake. Dormouse nests have been found at Ore nabb.
Needless to say, there are a number of species of bat around the lake, including the long-eared bat.
Frogs and reptiles
The moor frog, common frog, toad, small water salamander, wood lizard, copper lizard, grass snake and adder have all been seen here.
We particularly recommend the shiny blue moor frog's plopping performance during the first warm days at the beginning or middle of April. The foot-bridge at Hornborga Naturum and the ponds south of Ängsladan, along the walking track known as Ytterbergsleden, are usually the site of entertaining frog displays during a few short and intensive spring days.