Study on fish passage efficiency evaluation of Shawan Hydropower Station on Dadu River

Abstract

In order to understand the fish passing effect of the fishway of Shawan Hydropower Station, this study carried out the passing and reentry tests in the fishway.Spinibarbus sinensis was taken as the research object, the tracing behavior of marked fish was recorded by installing(Passive Integrated Transpondere, PIT) monitoring equipment in the fishway. The result showed that a total of 284 fish belonging to 2 orders, 4 families, 13 genera and 15 species were collected during the investigation period. The dominant species(IRI>1 000) under the dam were C.fuscoguttatus, Pseudorasbora parva, Onychostoma belcheri, Scleroderma brachygnathus, Scleroderma labeo and Scleroderma labeo. A total of 258 fish species were collected in the fishway, belonging to 10 genera, 2 families and 1 order. The dominant species(IRI>1 000) in the fishway were Epinephelus acuminatus subsp.major, Leptobagrus przewalskii, Gobiocypris rarus, Hemibarbus labeo and Pseudorasbora parva. During the monitoring period, a total of 1 848 labeled fish signals were obtained, a total of 221 labeled fish were monitored, and 70 fish were not monitored.The upward rate of the marked fish was 36.08%, the reentry rate was 58.42%, and the pass rate was 18.10%. During the monitoring period, the number of signals monitored during the day(8:00—20:00) was higher than that at night(20:00—8:00), and the most frequent periods of fishway use were 10:00—11:00,15:00—16:00 and 16:00—17:00. This study can provide a reference for the study of fish passage effect of domestic fish passage facilities.

Keywords

fishway / PIT marker / IRI / pass rate / Spinibarbus sinensis