Field Experiment on the Migration of Fishes to a Paddy Field with a Small Fishway
ISSN | 00213551 |
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書誌レコードID(総合目録DB) | AA0068709X |
Medaka (Oryzias latipes) populations have recently declinedto such alevel that they are listed as a species in danger of extinction in the Red Data Book. And a decline in the numbers of catfish and loach has been reported in various parts of Japan. One cause of their decline is the increase in the drop height between paddy fields and water channels, particularly drainage channels. For catfish, loach,and medaka, paddy fields are important spawning grounds or habitats. This report describes the results of a study conducted by the construction of an experimental fishway that fish can use to migrate into an idle paddy field beside Lake Kasumigaura and for the observation and determination of the actual migration of fish swimming through the fishway during a 2-year period from 1997 to 1998. It was observed that immediately after the opening of the sluice gate between Lake Kasumigaura and the channel, the number of fishes migrating to the experimental site, which were assumed to have been carried by water flowing from the Lake, reached a peak.
刊行年月日 | |
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作成者 | HATA Kenji |
著者キーワード |
biological diversity paddy irrigation systems fish protection |
公開者 | Japan International Research Center for Agricultural Sciences |
オンライン掲載日 | |
国立情報学研究所メタデータ主題語彙集(資源タイプ) | Journal Article |
巻 | 36 |
号 | 4 |
開始ページ | 219 |
終了ページ | 225 |
DOI | 10.6090/jarq.36.219 |
権利 | Japan International Research Center for Agricultural Sciences |
言語 | eng |