Seasonal and spatial differences in fish assemblage structures in dyke foot waterways connected to Lake Kitaura, Ibaraki Prefecture, Japan

Igari Kenta, Endo Tomoki, Kaneko Seiya, Usui Seiji, Arayama Kazunori, Kanou Kouki

doi:10.11233/aquaculturesci.65.377

Seasonal and spatial variation in fish assemblage structures in artificial canal habitat around lake was examined by monthly fyke net sampling at two dyke foot waterways (Tsumagi and Shirahama) connected to Lake Kitaura, Ibaraki Prefecture, central Japan, from April 2013 to March 2014. The mean number of fish species was significantly greater at Tsumagi than at Shirahama in most months. A similarity index indicated differences in species composition of the fish assemblages between the two sites. Of four dominant species, individual densities of the two crucian carps (Carassius sp. and C. buergeri subsp. 2) and the adrianichthyid Oryzias latipes, which spawn only on submerged and emergent plants, were more abundant at Tsumagi than at Shirahama. The opposite tendency was found for the cyprinid Pseudorasbora parva spawning on various substrates. Based on the occurrence patterns and body sizes of fishes sampled, such differences in fish assemblage structures may be partly related to different agricultural activities (rice field at Tsumagi and lotus field at Shirahama) and/or water management in each sampling site.

Seasonal and spatial differences in fish assemblage structures in dyke foot waterways connected to Lake Kitaura, Ibaraki Prefecture, Japan

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