Most authorities recognize three species within the perch genus: 1  The European perch (Perca fluviatilis) is found in Europe and Asia. 2  The Balkhash perch (Perca schrenkii) is found in Kazakhstan, (in Lake Balkhash and Lake Alakol), Uzbekistan, and China.
Foods to avoid with diverticulitis. In the past, doctors had recommended that people with diverticular disease (diverticulosis or diverticulitis) avoid hard-to-digest foods such as nuts, corn, popcorn or seeds, because of the risk that these foods may get stuck in the diverticula and lead to inflammation.
If you have diverticulitis you should aim to make dietary changes slowly - one step at a time. Including fibre in the form of soluble fibre from fruit and vegetables is gentler on the system. Some people with diverticulitis avoid nuts, seeds, corn, popcorn and tomatoes but there is no evidence that this is needed or helpful.