The impact of nigorobuna crucian carp larvae/fry stocking and rice-straw application on the community structure of aquatic organisms in Japanese rice fields

Autor:	Masayoshi Maehata, Fujiyoshi Shibahara, Kiyoyuki Imai, Makoto Kimura, Hiroyuki Obayashi, Taisuke Ohtsuka, Masatsugu Yamazaki, Yasushi Kusuoka
Rok vydání:	2010
Předmět:	Japanese rice Stocking biology Cladocera Botany Crucian carp Paddy field Zoology Aquatic animal Aquatic Science biology.organism_classification Population density Predation
Zdroj:	Fisheries Science. 76:207-217
ISSN:	1444-2906 0919-9268
DOI:	10.1007/s12562-009-0200-3
Popis:	We examined the effects of predation by Nigorobuna Carassius auratus grandoculis larvae and fry, a crucian carp endemic to Lake Biwa, Japan, on the community structure of aquatic organisms in rice fields. Six experimental plots with three different rice-straw treatments in the presence/absence of stocked larvae were prepared. In each plot, the number of aquatic organisms ranging in size from 30 μm to 5 mm in the water, as well as those from 63 μm to 5 mm in size in the surface sediments, was surveyed 6, 13, 20, 26, 34, and 41 days after the onset of irrigation. Three-day-old fish larvae were released on day 10. Undigested organisms in the gut contents of the larvae or fry were identified on days 20, 26, 34, and 41, respectively. Ten-day-old larvae mainly preyed on Cladocera, but the fry thereafter shifted to Diptera as their main prey. While Cladocera and Podocopida decreased in fish-stocked plots, Euglenales and Halteriida became more abundant there. Top-down or bottom-up effects of fish seemed to control these changes in community structure.
Databáze:	OpenAIRE
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