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
National Sea Grant College Program

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:

(Date:7/10/2020)... ... July 09, 2020 , ... Today CJ BIO announced the ... share insight on the “fifth taste” phenomenon that is revolutionizing ingredient mixes, nutritional content ... will be live on Monday, July 13, 2020 at11:00 AM (CDT) during SHIFT20, the ...
(Date:7/2/2020)... ... July 02, 2020 , ... ... (MBS) has announced a publication detailing the use of its revolutionary NEXTGENPCR ... chain reaction (RT-PCR) in 16 minutes. The article, titled "Ultra-fast one-step RT-PCR ...
(Date:6/28/2020)... ... June 25, 2020 , ... ... for biopharmaceutical R&D, today announced that it has entered into a multi-year ... antibodies (Multiclonics®), to support their translational and clinical research strategy to discover ...
Breaking Biology News(10 mins):
(Date:8/15/2020)... ... August 13, 2020 , ... Inc. magazine ... the most prestigious ranking of the nation’s fastest-growing private companies. The list represents ... dynamic segment—its independent small businesses. Intuit, Zappos, Under Armour, Microsoft, Patagonia, and many ...
(Date:8/12/2020)... BINGHAM FARMS, Mich. (PRWEB) , ... August 12, ... ... International Consulting Group, Inc. (EMMA International), a global leader in FDA compliance ... ranking of the nation’s fastest-growing private companies. The list represents a unique look ...
(Date:8/3/2020)... ... 2020 , ... Introducing Ardent Animal Health – MediVet Biologics rebrands company and ... Known as MediVet Biologics since its formation in 2016, the company is relaunching itself ... will build on its base of innovative therapies for osteoarthritis and cancer. ...
(Date:7/31/2020)... Mass. (PRWEB) , ... July 29, 2020 , ... ... highly reliable, solid-state radar transmitter systems that can be configured to drive Klystrons, ... single controller that can drive one or two switches in a push-pull configuration; ...
Breaking Biology Technology:
Cached News: