In addition to koi and goldfish, many pond owners keep other "native" fish species in their pond. These Central European or North American fish species are known as biotope fish. The most common species are moderlieschen, gudgeons, ides & golden orfes, three-spined sticklebacks, European bitterlings, minnow species and others. Most biotope fish species are small animal eaters. Some species also eat plant matter. As goldfish and koi have a different food spectrum and often also a different size, biotope fish, which are usually much smaller, should be fed with a special biotope fish food such as JBL PROPOND Biotope. Goldfish and koi will certainly also eat JBL PROPOND Biotope when feeding. However, this is not a problem, as they are also very happy to eat and tolerate the ingredients of the food.