Tuesday, August 31, 2010
These fish were originally introduced for the purpose of algae control, but then spread in an unintended manner. They can grow to over 20 feet long and 100 pounds, eating up to 40% of their weight a day in plankton. This causes a danger to the food chain, especially for the bottom of it. Asian carp are also know for jumping out of the water when they are scared or alarmed, which happens somewhat frequently in the presence of boats, since they feed near the water's surface. For a fish this size, unpredictable flight type movements have been known to injure boaters and fisherman. This video can help you get an idea of the movement of these fish.
For a suggested reading list on Great Lakes Fish, click here.
Asian Bighead carp photo by M. Spencer Green.
Monday, August 30, 2010
WDNR photo shows an adult yellow perch with young-of-year perch.
Thursday, August 26, 2010
Lidar is a laser-based technology used to map land, beach, and underwater elevations. Planes equipped with lidar sensors have been surveying much of Lake Superior’s nearshore bathymetry since early July, and as of August 12, 2010, this bathymetric lidar data collection effort is complete.
Over 900 linear kilometers of data were collected in forty-seven days. This exceeded the requirements of the contract by close to 200 linear kilometers, as the original requirement was for collection of 725 linear kilometers of data. Fugro Lads used the LADS MkII system to collect the bathymetric lidar along the shoreline up to 1000 m lakeward or to the extinction of the laser. The same system was used to collect lidar points on land to approximately 30 m inland, so that this collection could be tied to existing and future topographic lidar collections.
This effort, funded by the Great Lakes Restoration Initiative, was extremely successful and will yield data that is greater than 85% very good or good depth coverage. Data in these categories typically extends out to around 20m depth. The raw data will now undergo a refinement process and a quality assurance process. The final data will be delivered to the federal government’s National Oceanic and Atmospheric Administration (NOAA) Coastal Services Center (Center), and the data will be served from the Center’s Digital Coast website by the winter of 2011. Through this website the data will be available for use, free of charge.
Standardized data protocols for processing, assuring quality, and serving the data will be followed, which means a wide variety of organizations can use these data for many different uses. Uses for this dataset are wide-ranging, including planning for restoration efforts, remediating stamp sands, evaluating essential fish habitat, enhancing navigation, and developing scenarios for lake level drop.
photo courtesy of Minn. Sea Grant
Wednesday, August 25, 2010
The 2010 season marks the fourth year that the minimum length for harvesting sturgeon is set at 60 inches, with a one-fish limit per season. There is a catch and release season on a stretch of the Menominee River downstream from the Hattie Street dam to Green Bay.
New this year is a catch and release season on the lower St. Croix River from St. Croix Falls Dam downstream to the Mississippi River from Oct. 1 through Oct. 15 to allow Wisconsin and Minnesota to have the same regulations for the same species. This is not reflected in the Fishing Regulations 2010-2011.Remember to follow all required fishing regulations and bring your bug spray!
About the Hook and Line Season
News release from WDNR.
photo used by permission from the Shedd Aquarium, Chicago
Friday, August 20, 2010
From the website, On This Day in Wisconsin (from the WHS), a favorite of Wisconsin's Water Library.
Thursday, August 19, 2010
Several new project reports and articles (dated 2008 through 2010) and three new photos of harbor corrosion in Thunder Bay, Canada (from 2007) are now available on the Duluth-Superior Harbor Corrosion Study website from Wisconsin Sea Grant. Also included on the site is the most up-to-date fact sheet about the project.
Updated content includes:
- Duluth-Superior Harbor Freshwater Corrosion Update (presented ASCE Ports 2010), April 2010
- Cofferdam Applied Coating Trial, October 2009
- Duluth Superior Harbor Steel Structure Alternative Repair Installation & Protection Report, December 2008
- Duluth Superior Harbor Existing In-Place Coating Assessment, December 2008
- Accelerated Freshwater Harbor Corrosion Fact Sheet, UW Sea Grant Institute, April 2010
- "Finding Solutions To A Mysterious Harbor Corrosion Problem," Wisconsin Coastal Management Chronicle, 2009
- 2007 Field Investigations – Examples of Corrosion in Other Great Lakes Harbors & Marinas (Three Thunder Bay, Canada examples) taken by Jim Sharrow (Duluth Seaway Port Authority) can be viewed here.
If you have any questions about the project and its results, please contact Gene Clark at (715) 394-8472 or at firstname.lastname@example.org
This spring and summer, we have added books on a wide range of topics relating to water - climate change, ponds, frogs, science writing and more.
Check it out!
The library is continually adding to its collection so we encourage you to check back often to our Kids Library website.
Wednesday, August 18, 2010
For reading recommendations on Coastal Communities, please see our reading list, here. For further reading on Flooding, please see this reading list. An abbreviated list of videos that Wisconsin's Water Library carries can be seen here.
DVD cover photo from Trouble the Water film site.
Monday, August 16, 2010
Photo by Elizabeth J. Czarapata from the DNR.
Thursday, August 12, 2010
Photo courtesy of City of Bayfield website.
Tuesday, August 10, 2010
Arctic Sea Annual Ice Minimum (picture) from 2009 The State of the Climate Highlights.
Monday, August 2, 2010
The International Coastal Atlas Network serves a global reference for the development of CWAs. The Great Lakes meeting will be the fifth ICAN meeting since 2006. Previous meetings were held in Ireland, Oregon, Denmark, and Italy.
The ICAN-Great Lakes meeting will open on the afternoon of Monday, September 13th with an overview of ICAN and CWAs and will feature a showcase of mature coastal atlases with a focus on their impacts. The morning of the second day will explore use cases for interoperable coastal atlases, addressing topics such as marine spatial planning and climate adaptation. The afternoon will focus on building regional/thematic networks of coastal atlases and will explore how CWAs relate to initiative such as the Digital Coast and the Integrated Ocean Observing System. The afternoon session will also include a demonstration of integration of Great Lakes data from distributed sources to support decision-making. The technical session on the morning of Wednesday, September 15th provides training on implementing interoperable web map services and catalogs for CWAs led by Tom Kralidis of Environment Canada. There is a separate registration fee for this session and space is limited.
More information about the ICAN-Great Lakes meeting (including registration and lodging information) can be found at http://www.aqua.wisc.edu/ican/.