dams found to be barrier to fish breeding
Last Updated : GMT 09:07:40
Egypt Today, egypt today
Egypt Today, egypt today
Last Updated : GMT 09:07:40
Egypt Today, egypt today

Dams found to be barrier to fish breeding

Egypt Today, egypt today

Egypt Today, egypt today Dams found to be barrier to fish breeding

Amherst - UPI

Despite designs intended to allow migratory fish to pass, hydropower dams on major Northeast U.S. waterways are not helping fish, researchers say. Experts say fishways meant to give fish a route around dams have failed to let economically important species such as salmon, shad and river herring reach their spawning grounds. Despite state-of-the-art fish passage facilities, the numbers of fish passing through them over several decades reached only a tiny fraction of targeted goals, they said. "It may be time to admit failure of fish passage and hatchery-based restoration programs and acknowledge that ecologically and economically significant diadromous species restoration is not possible without dam removals," the researchers wrote in the journal Conservation Letters. Diadromous species are fish that migrate from the sea to spawn in rivers. The three river systems studied, the Merrimack, Connecticut and Susquehanna, are historically important to populations of such species, researchers said. Numbers of American shad, once one of the country's premier food fish, hovered around 2 percent of the target in the Merrimack River and was close to zero percent of target in the other two, they said. "These dams are contributing to reduced resilience of not only shad, but all diadromous species," said Adrian Jordaan of the University of Massachusetts Amherst. The findings raise serious questions about the impact of new dams now being planned and constructed on major waterways worldwide, the researchers said.

egypttoday
egypttoday

Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

dams found to be barrier to fish breeding dams found to be barrier to fish breeding



GMT 09:23 2019 Friday ,30 August

Testing

GMT 17:09 2017 Friday ,29 December

At least 14 dead in Mumbai fire

GMT 13:44 2017 Thursday ,21 December

Nine-time champion Loeb set for 2018 cameo

GMT 13:08 2017 Tuesday ,26 September

Bahrain's aluminum industry thriving, manned by 12,184

GMT 08:50 2017 Sunday ,03 December

Reza Zarrab, the star witness unnerving Ankara

GMT 18:26 2018 Friday ,14 December

Mashrou’ Leila headline Apple event in Dubai

GMT 12:35 2018 Thursday ,01 November

UN chief appoints new special envoy for Syria
 
 Egypt Today Facebook,egypt today facebook  Egypt Today Twitter,egypt today twitter Egypt Today Rss,egypt today rss  Egypt Today Youtube,egypt today youtube  Egypt Today Youtube,egypt today youtube

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©

Maintained and developed by Arabs Today Group SAL.
All rights reserved to Arab Today Media Group 2021 ©

egypttoday egypttoday egypttoday egypttoday
egypttoday egypttoday egypttoday
egypttoday
بناية النخيل - رأس النبع _ خلف السفارة الفرنسية _بيروت - لبنان
egypttoday, Egypttoday, Egypttoday