The Chiayi County government in 1999 declared it illegal under Article 44 Item 4 of the Fishing Law to fish or take plants in Danaiku, thus giving the prohibition on fishing there a legal basis.
嘉義縣政府更在民國八十八年，引用漁業法第四十四條第四款，公告達娜伊谷溪流域之公共流域，禁止採捕水產動植物，使得達娜伊谷實施的禁漁措施有了法源依據。