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 The changes of biodiversity, indicator species (IS) and catch per unit effort (CPUE) of bony fishes in beach seines in Iranian waters of the Caspian Sea during 1996 to 2012 was investigated. Among the catch of 14 species/groups, kutum and mullet comprised 56.78% and 31.81% of the total catch. Minimum and maximum CPUE were 158.5±9.1 and 344.9±31.2 kg/haul and Shannon diversity was 0.57±0.02 and 0.92±0.02, respectively. There were significant differences in community composition of fishes in beach seines among three seining times (morning, afternoon and night time), three seining periods (1996-2000, 2000-2005 and 2005-2012), three regions (west, middle and east), and different seasons (in all cases MRPP, p<0.001). During 1996-2000, Rutilus rutilus, Vimba vimba, Chalcalburnus chalcoides, Aspius aspius, Barbus sp., Salmo trutta caspius and, Silurus glanis in the years 2000-2005 species/groups shads, Abramis brama and Esox lucius and in the years 2005-2012 species Cyprinus carpio and Stizostedion lucioperca were indicator species. Also, in the west region of the Caspian Sea species/groups V. vimba, C. chalcoides, A. aspius, Barbus sp., A. brama,S.lucioperca,E.lucius and S. glanis; in middle Rutilus frisii kutum, shads and S. trutta caspius and in east species/groups mullets, R. rutilus and C. carpio were identified as indicator species.

Keywords: CPUE, Biodiversity, CPUE, Indicator species, Bonyfishes, Caspian Sea

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