The Parramatta fishways project aims to unlock native fish migration routes that have been blocked by the weir system. By restoring natural breeding cycles, native fish populations and biodiversity will increase, and the river be rehabilitated.
The vertical fish-way enables fish to climb or descend where a weir exists. The lower gate periodically opens, allowing fish to enter or exit. The upper gate then opens and fills the lock with water, allowing fish to ascend or descend.