Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Danube Delta' has mentioned 'Fish' in the following places:
Occurrence Sentence Text Source
It is an environment rich in plankton, worms, molluscs, grubs, and sponges, with numerous species of fish, such as the carp, pike, pike perch, sheat-fish, and freshwater sturgeons (sterlet, Vyza[check spelling] and Danube mackerel[check spelling]).
Of the fish, the most important are Tench (Tinca tinca), common bream (Abramis brama), common rudd (Scardinius erythropthalmus), Prussian carp (Carassius auratus gibelio), wels catfish (Silurus glanis), European perch (Perca fluviatilis), and northern pike (Esox lucius).
Natural environments have been altered, the breeding pattern of fish has been disrupted, and the flows in the main arms have increased, with serious consequences regarding the discharge of alluvia and the erosion of banks.
As a result of these changes, along with the increasing pollution and eutrophication of the waters of the Danube, and decades of exploitation and poor fishing regulations, the fish population has been visibly reduced.