Fish ladder in the Darebin Creek, at Darebin Parklands, Alphington.
A fish ladder, also known as a fishway, fish pass, fish steps, or fish cannon, is a structure on or around artificial and natural barriers (such as dams, locks and waterfalls) to facilitate diadromous fishes' natural migration as well as movements of potamodromous species. Most fishways enable fish to pass around the barriers by swimming and leaping up a series of relatively low steps (hence the term ladder) into the waters on the other side. The velocity of water falling over the steps has to be great enough to attract the fish to the ladder, but it cannot be so great that it washes fish back downstream or exhausts them to the point of inability to continue their journey upriver.
This post is part of the Roentare’s Water Meme
and also part of the Wordless Wednesday meme
and also part of the Nature Notes meme
Very interesting. I am glad to see humans helping fish affected by our actions.
ReplyDeleteSo very interesting.
ReplyDeleteHa. I've seen these but never knew they had a purpose. How interesting! #Waterthursday
ReplyDeleteThe stone steps are looking superb!
ReplyDelete