sent from a phone
> On 19. Jul 2018, at 10:22, Javier Sánchez Portero <javiers...@gmail.com> > wrote: > > Could a fish pass look like a short and very narrow canal like the images in > this pages? > > https://en.wikipedia.org/wiki/Levada > https://es.wikipedia.org/wiki/Acequia it is not so much about what it looks like, but about the purpose it was built for. Are fishes using those canals? Often (?) they might provide kind a steps so greater heights can be passed: http://www.htsbau.de/.cm4all/iproc.php/Button/FAH%20technisch.jpg/downsize_1280_0/FAH%20technisch.jpg http://de.academic.ru/pictures/dewiki/70/Fischtreppe_Isar_bei_Pullach.jpg wikipedia has a lot of examples as well: https://en.m.wikipedia.org/wiki/Fish_ladder Cheers, Martin
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