Navigation Links
Plunging fish numbers linked to dam releases
Date:6/11/2013

A significant decline in the numbers of native fish in Australia's Murray-Darling Basin may be linked to released dam water being too cold for breeding.

This is just one of the findings from a Griffith University led study which found current water releases back into the Murray-Darling system limit fish reproduction and therefore impact freshwater biodiversity.

Griffith University Research Fellow Dr Rob Rolls said the results, published in Freshwater Biology, throw cold water on the notion that large dam releases compensate for the effects of interrupting natural water flows. And it's not just seasonal flooding which is important; the natural low flow periods matter too.

"Golden perch an iconic species that significant value for recreational fishing and it is often assumed that large floods are necessary to initiate spawning and recruitment of golden perch and many other fish," Dr Rolls said.

"But we found that more than 90% of golden perch juveniles occurred in unregulated lowland rivers in the northern Murray-Darling Basin, which naturally stop flowing for weeks or months, while regulated reaches now flow constantly.

"Restoring these natural low flow periods is critical because it is these shallow, warm reaches of waterways which produce the food fish depend upon."

The team also found that releases from the Pindari Dam on the Severn River did not encourage fish spawning because the water is much colder compared with nearby unregulated rivers.

"Stream temperature has a significant effect on spawning opportunities for fish, and cold water released from the bottom of dams may limit the benefits of environment flows," Dr Rolls said.

"The negative impact of this could be minimised by modifying dams so the warmer water from the surface of reservoirs is released rather than from the bottom."


'/>"/>

Contact: Helen Wright
helen.wright@griffith.edu.au
61-047-840-6565
Griffith University
Source:Eurekalert

Page: 1

Related biology news :

1. UGA study finds theres not always safety in numbers when it comes to extinction risk
2. Fighting bacterias strength in numbers
3. New report puts real numbers behind history of oyster reefs
4. Safer spinach? Scientists technique dramatically reduces E. coli numbers
5. Scientists develop novel method to study parasite numbers in wild seabirds
6. Reducing numbers of 1 carnivore species indirectly leads to extinction of others
7. Recipe for large numbers of stem cells requires only one ingredient, says NIH/Pitt team
8. Women altering menstruation cycles in large numbers, UO study shows
9. Exposure to antibiotics linked to severity of allergic asthma: UBC research
10. Autism risk gene linked to differences in brain structure
11. Spontaneous gene glitches linked to autism risk with older dads
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/22/2016)... 2016   Acuant , the leading ... has partnered with RightCrowd ® to ... Management, Self-Service Kiosks and Continuous Workforce Assurance. ... functional enhancements to existing physical access control ... with an automated ID verification and authentication ...
(Date:6/20/2016)... , June 20, 2016 Securus Technologies, ... technology solutions for public safety, investigation, corrections and ... prisons involved, it has secured the final acceptance ... facilities for Managed Access Systems (MAS) installed. Furthermore, ... facilities to be installed by October, 2016. MAS ...
(Date:6/9/2016)... , June 9, 2016  Perkotek an innovation leader in attendance control systems is ... log work hours, for employers to make sure the right employees are actually signing ... http://photos.prnewswire.com/prnh/20160609/377486LOGO ... ... ...
Breaking Biology News(10 mins):
(Date:6/27/2016)...   Ginkgo Bioworks , a leading organism ... today awarded as one of the World Economic ... most innovative companies. Ginkgo Bioworks is engineering biology ... world in the nutrition, health and consumer goods ... customers including Fortune 500 companies to design microbes ...
(Date:6/23/2016)... ... June 23, 2016 , ... ... its second eBook, “Clinical Trials Patient Recruitment and Retention Tips.” Partnering with experienced ... this eBook by providing practical tips, tools, and strategies for clinical researchers. , ...
(Date:6/23/2016)... -- Houston Methodist Willowbrook Hospital has signed a ... serve as their official health care provider. As ... provide sponsorship support, athletic training services, and most ... athletes and families. "We are excited ... to bring Houston Methodist quality services and programs ...
(Date:6/23/2016)... ... 23, 2016 , ... Supplyframe, the Industry Network for electronics ... Lab . Located in Pasadena, Calif., the Design Lab’s mission is to bring ... designed, built and brought to market. , The Design Lab is Supplyframe’s physical ...
Breaking Biology Technology: