Hydro-powered electricity, however is not without its drawbacks. In addition to the significant threat that dams pose to fish populations and the ecosystems of rivers and streams, hydropower can negatively impact both the flow and quality of water. Lower levels of oxygen in the water can present a threat to animal and plant life . However, these issues can be addressed if fish ladders are put in place to ensure safe passage around the area, and the water is aerated on a regular basis to maintain adequate oxygen levels safe for animal and plant life . The flow of water should be monitored closely to prevent the ecological dangers associated with over-stressing bodies of water. These dangers can easily be avoided by shutting down pumping operations temporarily to allow balance to return to damaged ecosystems.
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