圖書典藏及影音數位平台

石岡壩魚道，於921地震復建時所增設，魚道工程於民國90年4月16日開工，90年12月11日完工。設計水流量0.3立方公尺，其入口(出水口)標高259.57公尺、出口(進水口)標高269.40公尺、總長147公尺，屬於水池階段式(Pool and Step or Pool and Weir Type)，係供洄游生物使用。歷年(截至民國111年)石岡壩魚道及其上下游之測站中，記錄15科47種魚類，甲殼類4科9種，水棲昆蟲8目20科，動物性浮游生物7種。生態調查結果顯示此河段的環境污染低且生物資源相當豐富。而歷年監測可說明石岡壩魚道的效果良好，本區的水域生態還是維持在相當好的程度，且上下游之間都有非常豐富的河川生物資源。 本計畫工作項目包括：(ㄧ)長庚橋至埤豐橋（含魚道）水域生態及洄游生物監測調查、(二)建立石岡壩魚道及其上下游水域生物物種名錄、(三)探討石岡壩魚道及其上下游之水理及水質與水域生物分布關係、(四) 辦理環境教育推廣活動、(五)統計分析生態資料並評估生態保育措施執行成效、(六)工作報告及成果報告編撰印製等。

The surveys of the four seasons, along with the supplementary fishway surveys and underwater photography, have recorded a total of 6,709 fish of 29species （8 orders, 10 families）, 60 crustaceans of 5 species （1 order, 3 families）, and 586 aquatic insects of 18 families （5 orders）.Historical records from the area surrounding Shigang Dam indicate 56 species of fish in 16 families, 9 species of crustaceans in 4 families.According to nMDS and historical population distribution data, there have been significant changes in population distribution upstream of Chang Gung Bridge, upstream of the main dam, and along the existing fishway itself. This is speculated to be due to the extreme flood discharge caused by the typhoon last year, which affected the fish population of the Dajia River. The ecologically sensitive marshy area has gradually evolved into a habitat suitable for terrestrial insects. Overall, the downstream channel stabilization and energy dissipation improvement project of the Shigang Dam has indeed followed ecological conservation measures.