Bottom fishing is rated as regional especially valuable with significant recreational fishing.
The bottom , which is actually 3 lakes, is located about 4 km southeast of Gränna. The altitude of the sea is 196.5 m, ie about 107 m above the surface of Vättern. The bottom is a moderately nutritious lake with an area of 10.18 km2 and a maximum depth of 20.8 m. The beaches are alternately steep and flat, mostly rocky. Slabs of gravel and sand occur. The vegetation consists of weak moderate varieties. The lake is mainly surrounded by pine forests with elements of leafy and cultivated fields. The catchment area is 170.0 km2 large and consists mostly of pine forests and cultivated fields.
The bottom has ecological function for red-listed species and is of some importance to bird life. The lake is also important for recreational fishing and active outdoor life. The fish is mainly carried out for pike, perch and goose. The fishery is managed by Norra and Södra Bunns FVOF. Total fishing effort in 2003 amounted to 3342 pc. Biodiversity may be considered to be quite high, mainly due to a relative species of fish fauna, a large sea surface, a high level of plotage, a significant hypolimnion, a wide variety of beaches, the bottom material and the nearest vicinity of the lake as well as a multifaceted beach and water vegetation.
Norra Bunns FVOF aims to manage and improve the fisheries conservation area.