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:5/16/2017)... N.J. , May 16, 2017  Veratad Technologies, ... provider of online age and identity verification solutions, announced ... K(NO)W Identity Conference 2017, May 15 thru May 17, ... Regan Building and International Trade Center. ... the globe and in today,s quickly evolving digital world, ...
(Date:4/18/2017)... 2017  Socionext Inc., a global expert in SoC-based imaging and ... the M820, which features the company,s hybrid codec technology. A demonstration ... Probe, Inc., will be showcased during the upcoming Medtec Japan at ... the Las Vegas Convention Center April 24-27. ... Click here for an ...
(Date:4/11/2017)... Research and Markets has announced the addition ... their offering. ... tracking market to grow at a CAGR of 30.37% during the ... 2017-2021, has been prepared based on an in-depth market analysis with ... its growth prospects over the coming years. The report also includes ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... Disappearing forests and increased emissions ... over 5.5 million people each year. Especially those living in larger cities are affected ... based in one of the most pollution-affected countries globally - decided to take action. ...
(Date:10/10/2017)... ... 10, 2017 , ... San Diego-based team building and cooking events company, Lajollacooks4u, ... The bold new look is part of a transformation to increase awareness, appeal ... growth period. , It will also expand its service offering from its signature gourmet ...
(Date:10/10/2017)... ... October 10, 2017 , ... Dr. Bob Harman, founder ... local San Diego Rotary Club. The event entitled “Stem Cells and ... had 300+ attendees. Dr. Harman, DVM, MPVM was joined by two human doctors: ...
(Date:10/10/2017)... BARBARA, CALIFORNIA (PRWEB) , ... October 10, 2017 ... ... management, technological innovation and business process optimization firm for the life sciences and ... BoxWorks conference in San Francisco. , The presentation, “Automating GxP Validation ...
Breaking Biology Technology: