Titus Seilheimer

@drfishsg

Aquatic ecology & Fisheries with Wisconsin Sea Grant. Science Communication. Helping improve the Great Lakes since 2001. #Freshwater, #Fish, #GreatLakes! He/Him. Manitowoc, WI go.wisc.edu/j0c989

2.022 Folgt3.015 Follower2.909 Posts

Bluesky

Ist das dein Profil?Übernimm es — dann gehört dir drfishsg.dirty.social.Profil übernehmen

Titus Seilheimer@drfishsg· 12d

Minnows for #SundayFishSketch. Today is the bullhead minnow.

Ink sketches of head-on views of three fish.

Titus Seilheimer@drfishsg· 19d

Ink sketches from this week. Day four of lampreys of Wisconsin. They're kind of boring. #SundayFishSketch

Titus Seilheimer@drfishsg· 19d

Talked wetlands on a paddle this morning with the Two Rivers Parks and Rec department. Picked up some trash. Saw a green heron. #GreatLakes

A canoe with some foam that was removed from the West Twin River.

Titus Seilheimer@drfishsg· 22d

Bumblebees are pretty awesome!

Bumblebee feeds on white mountain mint flowers

Titus Seilheimer@drfishsg· 25d

Fish faces. Goldeye and goldfish sketched today for #SundayFishSketch with some others from the week.

Titus Seilheimer@drfishsg· 26d

Ok half time show, I like this!

Titus Seilheimer@drfishsg· 29d

Oh, there's the button.

Titus Seilheimer@drfishsg· Jul 13

Done with the darters (well, "darter," because log perch is still to come), so today for #SundayFishSketch is the freshwater drum (aka sheepshead).

Titus Seilheimer@drfishsg· Jul 9

"I can't believe I ate the whole thing" is probably what this young of the year largemouth bass is thinking. I thought it has a disease because of a distended abdomen, but then saw the be tail of its meal sticking out of its mouth! #GreatLakes

A small fish with a black stripe is in a clear plastic box. It has the tail of its last meal, which was nearly the same size as it, sticking out of its mouth.

Titus Seilheimer@drfishsg· Jul 6

Still riding the darter train with today's Least Dater, one of the smaller fish species in North America. I worked with this tiny fish in the southern end of their range (glacial relic) in southern Oklahoma. #sundayfishsketch

Face-on ink sketches of three darter species. Iowa, Johnny, and Least Darters!

Titus Seilheimer@drfishsg· Jul 4

The Badger Car Ferry is in from Ludington, MI. This time of the year, the Badger makes two crossings per day. It is part of the US Highway 10 route.

400+ ferry boat with coal smoke coming out of the stack.

Titus Seilheimer@drfishsg· Jul 4

Working Waterfront. Manitowoc, WI Celebrating the Great Lakes since the ice retreated ten thousand years ago!

Breiss Malt Co elevator and ship unloading tower.

Titus Seilheimer@drfishsg· Jul 2

Flash in the dark. July 1, 2026 I assume in honor of Canada Day.

Titus Seilheimer@drfishsg· Jul 1

June 30, 2026 evening time lapse.

Titus Seilheimer@drfishsg· Jun 28

For today's #SundayFishSketch , I reached the darters. Not sure I love how they worked out but I've got 13 more to work out the kinks! Also the frowning daces from last week.

Ink sketches of two species of darter in the head-on view.

Ink sketches of four species of dace in the head-on view.

Titus Seilheimer@drfishsg· Jun 26

A little morning stream work.

Titus Seilheimer@drfishsg· Jun 25

An exceptionally low lake level in the lake Michigan-Huron basin ∼1650–1690C.E #GreatLakes 🧪 www.sciencedirect.com/science/arti...

Overview of the mid-17th century lowstand. A) Water level when the stump was sampled from 1.73 m water depth. Water level is 0.5 m lower in Lake Michigan-Huron basin because of 19th century dredging (Bishop, 1990). Glacioisostatic adjustment (GIA) of the Earth’s crust continues to decrease water depth relative to the lake outlet; thus, for the same lake level, water depth would have been 0.93 m deeper in 1650 (B). B) Water level must have been a minimum of 1.46 m below the record low-water level of Lake Michigan-Huron and stayed below that for at least 40 years for the tree to grow. Such a reconstruction requires a minimum 3.2 m drop in water level from an assumed mean paleo level based on the July 2022 water level, but more likely ∼3.7 m to account for a 30-year 0.5–0.6 m natural variability in water levels termed ‘freeboard’ here.

Titus Seilheimer@drfishsg· Jun 22

Smile, you're a father Mr. Bowfin!

Titus Seilheimer@drfishsg· Jun 22

Western Blacknose Dace for today's #SundayFishSketch. We've been seeing a lot of these in Port Washington lately. Also the other fish faces from the week. Cisco and Crappie.

Titus Seilheimer@drfishsg· Jun 16

Wisconsin's East Coast. #GreatLakes

Clouds, water, and beach with a pelican. Reflections.

Titus Seilheimer@drfishsg· Jun 14

Cisco face for #SundayFishSketch! Also known as Lake Herring (not actually a herring), this species supports a commercial fishery in the @GreatLakes.

Face on view of a fish. Blue and black ink.

Titus Seilheimer@drfishsg· Jun 8

Gravel Chub for today's #SundayFishSketch. Also some other funny fish faces.

Ink sketches of 6 Wisconsin fishes, head-on view. Catfish are the best for head-on view!

Titus Seilheimer@drfishsg· May 31

Another funny fish face for #SundayFishSketch with the Silver Carp. I'm working through all the Wisconsin species because head-on views are adorable!

A week's worth of head-on fish ink fish sketches. Adding some colors. I like that effect!

Titus Seilheimer@drfishsg· May 27

I recommend the new book from @stevebrusatte.bsky.social The Story of Birds. It covers the the whole story from the age of dinosaurs to today. Key message: Birds are dinosaurs! My son wanted to be a paleontologist when he was younger, but now switched to ornithologist. Same thing!

No: Bird watching
Yes: Dinosaur watching

Titus Seilheimer@drfishsg· May 27

Fig. 1. Conceptual model of dreissenid mussel shell production and dissolution impacts on carbon cycling in the Great Lakes through A) the process of biogenic calcification (biocalcification) of calcium carbonate from bicarbonate and calcium ions, producing a mole of carbon dioxide, and B) the reverse reaction when the shell chemically dissolves, producing bicarbonate and calcium from calcium carbonate and carbon dioxide.

Titus Seilheimer@drfishsg· May 26

Clouds over Mount Adams/Patú/cʼilíləɬ in a time lapse on a windy day.

Titus Seilheimer@drfishsg· May 24

It's another funny fish faces edition of #SundayFishSketch with the Black Bullhead. I think I'm starting to figure it out. Guest star, Smallmouth Buffalo.

Ink sketches of two fish in head-on view. Bullhead sporting some elaborate whiskers.

Titus Seilheimer@drfishsg· May 18

Forgot to post yesterday but here are more fish faces for #SundayFishSketch. Finished the bass with yellow bass.

Head-on views of three fish with bass in their name.

Titus Seilheimer@drfishsg· May 16

My 14th year of spring beach cleanups at Silver Creek beach in Manitowoc. At this point I just feel anger while picking up all this plastic. Why is this my job? Most common items were plastic bottle caps, misc small plastic, and cigar tips. Burned out on this endless effort... #GreatLakes

A messy beach on a sunny Lake Michigan day.

Titus Seilheimer@drfishsg· May 14

Reflections in streams