HOME >> BIOLOGY >> NEWS
Invasive gobies prevent sculpin spawning, impacting perch food chain

URBANA, ILL. Wherever round gobies turn up in large numbers in the Great Lakes and nearby waterways, mottled sculpin-a fish that is the major part of the yellow perch's diet--disappear. The gobies, an alien nuisance fish species similar in size and appearance to the native sculpins, are clearly out-competing them, but how?

One critical factor is that round gobies can interfere with mottled sculpin spawning, according to a study funded by Illinois-Indiana Sea Grant. In effect, the round gobies appear to evict defending mottled sculpins from spawning shelters.

"We tested this theory in an artificial stream and found that when round gobies were added to successful mottled sculpin nest areas, they ate the sculpin egg masses, changed to their spawning coloration and began to defend the sites," said John Janssen, biologist at the University of Wisconsin-Milwaukee.

"By interfering with mottled sculpin reproduction, the round goby may have a negative impact on the food supply of yellow perch, an important sport fish in Lake Michigan. At this point, we don't know whether the round goby will be a part of the yellow perch diet," Janssen added. Yellow perch populations have declined in recent years.

The round goby is native to the Black and Caspian Seas and was probably brought to the Great Lakes in the ballast water discharged from transatlantic ships. Gobies were first spotted in 1990 in the St. Clair River, the channel connecting Lake Huron and Lake St. Clair. Since then, the aggressive, robust fish has expanded its population throughout most of the Great Lakes. Now, experts are concerned that the goby will spread from the Great Lakes water basin to the Mississippi water basin, further affecting North American native species and ecosystems.

Round gobies look very similar to mottled sculpins. Gobies have large heads (as do sculpins) and so they slightly resemble large tadpoles. They are typically about 5 inches long,
'"/>

Contact: JohnJanssen
jjanssen@uwm.edu
414-382-1733
National Sea Grant College Program
5-Sep-2001


Page: 1 2

Related biology news :

1. Invasive species: A few bucks and a click away
2. Invasive plant outcompeted by its native ancestors
3. Invasive aliens
4. Invasive marine animals get bigger
5. Nonnative Invasive Plants of Southern Forests
6. Invasive species summit aims to halt Great Lakes-Mississippi River species exchange
7. Special section: Invasive species
8. Invasive species: Those who live together invade better
9. Invasive cordgrass in San Francisco Bay
10. Invasive fishes pose increasing threat to U.S. waters and native fishes, says USGS
11. USGS Scientists To Speak On Rare Plants And Invasive Species At Santa Barbara Symposium

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:7/2/2020)... ... 01, 2020 , ... AltruBio Inc. http://www.altrubio.com , a ... for the treatment of steroid-refractory acute graft-versus-host disease (SR-aGVHD), at European Hematology Association ... of the Fred Hutchinson Cancer Research Center, this single-arm, open-label Phase 1 single ...
(Date:6/28/2020)... ... June 25, 2020 , ... In an upcoming episode scheduled for ... Point of Care Testing solutions (POCT). Check local listings for more info. , Today, ... offices and are shipped to labs throughout the country. Results are then available several ...
(Date:6/23/2020)... ... 23, 2020 , ... Rigaku Corporation , a global ... a series of TOPIQ webinars, which will cover the Transferable Aspherical Atom Model ... response to social distancing measures that resulted in postponements and cancelations of global ...
Breaking Biology News(10 mins):
(Date:7/10/2020)... ... July 09, 2020 , ... ... is commonly used to suppress pigment formation in zebrafish embryos, maintaining optical transparency ... led by Dr MA has been using the zebrafish model to investigate the ...
(Date:7/7/2020)... ... July 06, 2020 , ... Bio-IT World ... Eli Lilly, Bristol-Myers Squibb, the University of Chicago, Massachusetts General Hospital, Mission: Cure, ... an elite awards program, highlighting outstanding examples of how technology innovations and strategic ...
(Date:7/1/2020)... ... June 30, 2020 , ... ... that the launch of a new clinical diagnostics immuno-oncology service, TissueInsight ... microenvironment (TME). , “Flagship’s TissueInsight is a service that aids pathologists, oncologists, ...
(Date:6/28/2020)... Conn. (PRWEB) , ... June 25, 2020 , ... ... formed to advance photodynamic therapy for treating cancer, today announced the company has ... York (“Roswell Park”). The agreement provides Lumeda globally exclusive rights to Roswell ...
Breaking Biology Technology:
Cached News: