Fishing Circumstances on the Danube in Serbia - 10





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Results and Discussion
Through analysis of statistical data taken from the Statistical Office of the Republic of Serbia from the period beginning in 1951, when the first catch data on freshwater fish species was recorded, until 2011, many changes in the organization and collection of data were observed. According to fish catch data statistics in Serbia recorded between 1951 and 2011, the number of reporting units has been changed many times. From 1956 until 1996 the number of reporting units in Serbia has decreased: there were 77 units in 1956, 35 in 1961, 33 in 1969 and 7 units in 1996 who reported annual catch numbers to the Statistical Office of the Republic of Serbia. In 2003, only three reporting units remained. Statistical methods used were changing till the year 2005, when electronic data archiving was introduced.
In the period between 1951 and 2010 the list of fish species collected and presented in statistical reports has been changed several times, which indicates that the composition of the ichthyofauna has changed and/or is changing the structure and abundance of certain species of fish or their importance on the market.
Until 1968 the Statistical Office collected catch data for species recorded in rivers, channels, and lakes by both recreational and commercial fishermen together. Species listed in the landing books made by each reporting unit were: Acipenseridae together (sterlet (Acipenser ruthenus), Russian sturgeon (Acipenser gueldenstaedtii), beluga (Huso huso)); pikeperch (Sander lucioperca); European catfish (Silurus glanis); carp (Cyprinus carpio); pike (Esox lucius); tench (Tinca tinca); secondary economically important fish; bleak (Alburnus alburnus); European eel (Anguilla anguilla); Black sea shad (Alosa immaculata) and other.
From 1969 recorded catch particularly from the Danube shows that species listed in catch were: Russian sturgeon; stellate sturgeon (Acipenser stellatus); beluga; sterlet; carp; Prussian carp (Carassius gibelio); grasscarp (Ctenopharyngodon idella); silver carp (Hypophthalmichthys molitrix); bighead carp (Hypophthalmichthys nobilis); bream (Abramis brama); pikeperch; pike; European catfish; asp (Aspius aspius); ide (Leuciscus idus); zobel (Ballerus sapa); tench.
From 1977, three non-native fish species (Prussian carp, silver carp and bighead carp) became economically important for fisheries in Serbia.