Engbretson Underwater Photography

Search The Fish Photos

News From Behind the Scenes at Engbretson Underwater Photo and Stories about the Freshwater Environments We Visit.

Thursday, December 5, 2013

Trout Underwater: Patrick Clayton Joins Our Team

Brown Trout (c)Patrick Clayton/Engbretson Underwater Photography
One of the best parts of operating a stock photo agency is acquiring exciting, new photographers to represent. Our newest contributor is Patrick Clayton, one of the country's best-known and most talented trout photographers.  Patrick's dynamic and colorful images of stream trout, taken underwater in the legendary streams of the American West are without a doubt some of the best ever made.  As you can imagine, this collection of brilliant photography took thousands of hours to collect.  But as I always say, "If it were easy, everybody would be doing it." 

Patrick's love and admiration for these fish are apparent in every image he makes.  These magnificent fish finally have a photographer who has seemingly captured every nuance of their intrinsic beauty time and time again, in photographs that also celebrate the pristine back-country streams they call home.  I've been a long time admirer of Patrick Clayton, and you'll become one too after seeing his pictures.  You can view Patrick's outstanding work in our Patrick Clayton Gallery here.

Patrick joins Bryce Gibson, Todd Pearsons, Christopher Morey, Isaac Szabo, Paul Vecsei and Roger Peterson on our "dream team" of the USA's best freshwater fish photographers.  His work can be licensed for commercial and editorial purposes by contacting us here at Engbretson Underwater Photography.

Wednesday, November 13, 2013

Tennessee's Top Fish Photographer Joins Our Team

Hellbender Salamander (c)Bryce Gibson/Engbretson Underwater Photo

I'm really excited to announce that photographer Bryce Gibson has joined our team of exceptional fish photographers here at Engbretson Underwater Photography!  Bryce is from Tennessee, home to one of the most ecologically rich and diverse native fish communities in North America.  His images of many unique and rare species from snail darters to hellbender salamanders helps fill an important niche in our efforts to expand our coverage to include all North American fish species, both game and non-game species alike, as well as some select amphibians.  You can view more of Bryce's work in our Bryce Gibson Gallery here.

Bryce joins Todd Pearsons, Christopher Morey, Roger Peterson, Isaac Szabo and Paul Vecsei on our "dream team" of the USA's top freshwater fish photographers!  His work can be licensed for commercial and editorial purposes by contacting us here at Engbretson Underwater Photography.

Wednesday, October 30, 2013

Best Pictures of Ciscoes Ever Taken

School of Ciscoes Underwater (c)Paul Vecsei/Engbretson Underwater Photography

Our top contributing photographer, Paul Vecsei, has done it again!  He's taken some truly remarkable photos of a rather elusive fish.  Paul has captured the best pictures of Cisco ever taken.  This is a species that has rarely been photographed in it's natural habitat.  Paul's images of these fish are breath-taking and are without questions the most exceptional images of this species ever made.  To view these stunning images of Ciscoes, click here.  To see all of Paul's remarkable fish photography, click here.  Paul's images can be licensed for commercial and editorial use by contacting Engbretson Underwater Photography.

Saturday, September 21, 2013

Photographing fish in their habitat - Hutchinson Leader: Outdoors & Recreation

Last August, freelance writer Scott Mackenthun interviewed me at the American Fisheries Society national convention in St. Paul, MN.  He asked how I got started in underwater photography and about some of the things I've seen over the years.  His interview with me was published in the Hutchinson Leader and can be read by clicking on this link:  Photographing fish in their habitat - Hutchinson Leader: Outdoors & Recreation

Sunday, July 7, 2013

Fisheries Scientist Now On Board

Sockeye Salmon (c)Todd Pearsons/Engbretson Underwater Photography

I'm genuinely thrilled to welcome the addition of Todd Pearsons to our team of superb underwater photographers here at Engbretson Underwater Photography!  Todd is a true expert in his field.  He has a Ph.D. in fisheries science.  (They don't give those things out to just anybody.)  Todd has studied and photographed fish for over 25 years and is a well known and respected figure in this field.  His list of published scientific credits is both lengthy and impressive.  In short-Todd knows fish!  

Todd is based in Ellensburg, Washington and regularly photographs many of the west coast trout and salmon  species that region is so famous for.  His underwater images of sockeye salmon are striking but he also photographs many other species of the Pacific Northwest that aren't quite as sexy.  His portfolio contains many non-game species including rare underwater images of Northern Pikeminnow for example.   

I'm excited to be representing the underwater photography of Todd Pearsons which can be licensed for editorial and commercial purposes on my website.  You can view more of Todd's work in the Todd Pearsons Gallery on my website.  Todd joins Christopher Morey, Paul Vecsei, Roger Peterson, Isaac Szabo and myself on the "dream team" here at Engbretson Underwater Photography.

Saturday, June 29, 2013

Lake on The Brink-The Unexpected Consequences of Treating Eurasian Watermilfoil

In 2012, Greg Matzke, a fisheries biologist for the Wisconsin Department of Natural Resources, made a startling discovery on Florence County’s Lake Ellwood. During a comprehensive fish survey which included spring, summer and fall netting and electrofishing surveys, Matzke discovered that all of the lake’s largemouth bass were older than 5 years of age, with approximately 91% of the largemouth bass population being at least seven years old.  The absence of younger fish indicated a recruitment failure for a number of years.  Such failures in largemouth bass recruitment over multiple years are unprecedented in the state of Wisconsin. 

“The current largemouth bass population is in serious trouble,” Matzke reported. “It appears that natural reproduction of largemouth bass has not occurred since 2007. As these older/larger fish move through the population, a significant reduction in largemouth bass abundance will take place, with the potential for the complete loss of this species of fish unless the current situation changes.”

Matzke next began looking at the lake’s panfish population.  What he found was stunning. Overall, the lake’s panfish abundance had fallen an estimated 75% in just the last 10 years, with bluegill and rock bass abundance down an estimated 65% and 89% respectively, showing that these populations also appear to be collapsing. Intense sampling throughout 2012 found only a single black crappie under six years of age, showing another alarming recruitment failure in several consecutive years. When Matzke analyzed the ages of Lake Ellwood’s northern pike population, the results were even more disappointing: There were no pike under the age of eight!  

Matzke stared at the data he had collected. His department had never seen a mystery like the absolute and complete recruitment failures of native northern pike, black crappie, and largemouth bass (along with significant reductions in recruitment of other panfish populations). He shared his findings with other fisheries professionals across the state and they all said the same thing.  They had never seen a collapse like this in their careers. Matzke and his team scrambled to collect more data and tried to find a cause that could have brought the fish to the brink of extirpation in Lake Ellwood. Surveys from 2002 had shown normal abundance, size structure, growth, and recruitment in all of these species. What had happened in the last ten years that was preventing fish from successfully reproducing? 

The only thriving species of game fish in the lake were smallmouth bass. Their abundance and size structure had grown in the last decade and recruitment was high.  This suggested that the problem was targeting specific species of fish. Because Lake Ellwood’s smallmouth bass were doing so well while the other species were collapsing, the focus turned to the lake’s historically sparse but important aquatic plant community. All the species showing recruitment failures are highly dependent on aquatic vegetation for spawning as well as cover and food for their young. Matzke observed that smallmouth bass seem to be different. “The fact that this species was not affected by the reduction in plant life,” he said, “is not a major surprise since as a species smallmouth bass are less dependent on aquatic vegetation.”

The Smoking Gun
Eurasian Water Milfoil was discovered in Lake Ellwood in 2002. Herbicide treatments began in 2003 and increased every year. By 2007 recruitment of northern pike, largemouth bass and black crappie had come to an end. “When I started to analyze the data it was strikingly obvious to me that there are some problems associated with the herbicide”, said Matzke. When he graphed the fish abundance (by year class) over the last decade and overlaid it with a graph showing yearly herbicide treatments, he found what he believed was a critical connection.  Fish numbers fell as the amount of herbicide increased.  Interestingly, in the year following a relatively low application of herbicide, young bluegill (and black crappie to a much smaller degree) began to appear again, but their numbers are still very low and they will likely disappear before they reach age 2.

“We still wonder which stage of reproduction has failed in these species”, says Matzke. “Aquatic vegetation plays a major role in spawning site selection and in the survival of eggs and fry. Plants are also the source of primary production providing food and habitat for young fish and prey items, including invertebrates and minnows. It seems likely that one or all of these important phases of reproduction are dwindling in Lake Ellwood.”

On April 17, 2013 Matzke met with the Lake Ellwood Association to reveal his data and conclusions. He told the group, “The main cause for failed northern pike, largemouth bass and black crappie recruitment (along with the massive reduction in panfish abundance) appears to be the loss of aquatic vegetation.” The 2-4-D herbicide used on Eurasian watermilfoil had been successful in reducing the abundance of this invasive species significantly. Conversely, other native plants were also harmed by years of chemical treatment. Matzke said he has no reason to believe the chemicals have directly caused a failure in reproduction of any species of fish in Lake Ellwood. However, Matzke does believe that the chemicals have indirectly caused recruitment failure by eliminating too many of the aquatic plants young fish need in order to survive.  Matzke has called for a change in the way the Lake Ellwood Association has been managing the lakes aquatic plants.  He recommended that further chemical treatments for milfoil be stopped.

“First and foremost,” says Matzke, “we need to promote and strengthen aquatic vegetation in Lake Ellwood.” He stresses the role of aquatic vegetation in spawning and concludes that the loss of vegetation (including the invasive milfoil) has almost certainly wiped out a great deal of forage for young fish.

It seems that milfoil treatments controlled the invasive plant but also jeopardized the health of the lakes fishery. Today the lake contains a dwindling and rapidly aging population of largemouth bass, black crappie, northern pike, and bluegill. Matzke hopes the plants will come back in time for the remaining old fish to produce at least one year class before they die. If that doesn’t happen, many fish populations will likely be extirpated from Lake Ellwood. New fish can be stocked, of course, but the lake would lose the unique genetic lineage of the fish that have lived there for thousands of years.

The Future
Could chemical herbicide treatments for Eurasian watermilfoil be reducing fish recruitment in other lakes? None of the other lakes that have been receiving chemical treatments have had their fish populations surveyed this intensely. Large scale recruitment problems due to loss of important plant cover could be taking place throughout the region where the invasive plant is now being fought. There is no way to know if this is happening, and frankly, up until now, there has been no reason to find out.  Fisheries experts around the state are only now learning of Matzke’s findings on Lake Ellwood. In the future, they will likely start paying more attention to fish recruitment on lakes treated for Eurasian watermilfoil which would allow the Department of Natural Resources to determine whether this crisis is an isolated instance or a more widespread problem. 

In the meantime, it’s a race against time for Lake Ellwood’s native fish. The question remains: Will the plants come back in time to save these fish populations?

Read this story in In-Fisherman Magazine here.

(Note: An updated, follow-up article (Back From The Brink-How Lake Ellwood, Once Doomed Is Being Rescued), from May 2014 can be viewed by clicking here.)

Sunday, June 16, 2013

Why Fish Cribs Work and Why They Fail

When I encounter fish cribs in lakes where I scuba dive, I typically see one of two opposite things: cribs holding fish, and cribs attracting no fish at all. In years of first-hand underwater observation, I have noticed that the cribs with fish share certain characteristics. So do the cribs devoid of fish. I’ve concluded that there are two key aspects of cribs that succeed in drawing and holding impressive numbers of fish. Those two critical components are design and location. Let’s look at each one separately and see why some cribs succeed while other cribs fail.  


Years ago, fish cribs usually shared a single design. They consisted of big logs lashed together to make a cube like a miniature log cabin without a roof. The interior was stuffed with brush or tree branches and they were weighed down with concrete, cinder blocks, or heavy rocks. Since these structures can be very large, heavy, and almost impossible to move, they’re built in the wintertime in northern states and left on the ice, where they sink into place in the spring when the ice starts to melt. The cribs are usually square but sometimes rectangular. They are typically four or five feet high and four to eight feet long.

Since the classic wooden log-cabin style is the most popular kind of fish crib, my observations and comments focus on these specific types of cribs and in particular on the best ways to make them as effective as possible.

By their very nature, most fish cribs have a distinctly limited lifespan. When they’re fresh and their interiors are tightly packed with brush and tree limbs, minnows and juvenile fish will flock their way. The thick cover provides shelter and a place to hide from predators. The smaller fish penetrate deep into the cribs. Panfish will congregate outside or squeeze their way in where they can. Larger predator fish, such as bass and northern pike, will hang around the perimeter, attracted by the throngs of fish concentrated in this area.

The interior material of thick brush or tree branches gives rise to a problem that is endemic to fish cribs. The material provides dense cover that small fish need, but over time it disintegrates, leaving only the cribs’ outside skeleton intact. The center portion remains basically empty. Without brush and branches, the cribs can no longer protect small fish from larger fish. And once the small fish--a source of food--disappear, the crib also loses its appeal to the game fish, which no longer gather around the crib to enjoy the all-you-can-eat buffet it once was. While these cribs might occasionally still draw a few larger fish for shade or cover, they lose their major attraction as a feeding center. Most people don’t understand that the secret ingredient that makes a crib design successful is not the frame or the exoskeleton, but the thick interior brush. If that’s not a central component from the start, or if it’s lost, cribs will stop attracting fish. The frame may stay intact and last for decades, but the brush deteriorates much more quickly. If there were some way to re-stock these cribs with interior brush, we could vastly extend their viability and lifetime.

The Vertical Dimension

Height is infinitely more important than length. The higher the walls of the crib extend from the bottom, the more attractive the crib will prove to fish. You want a piece of genuine structure, not something that is just an inconspicuous component of the floor of the lake. In fact, cribs should measure no less than four feet high. Fish want something well above the lake floor, and they like to choose the depth they want to hold while remaining close to the structure.

One of the best fish cribs I’ve ever seen was created entirely by accident. It was rectangular and four feet high, four feet wide, and 12 feet long. It was placed on the ice in 17 feet of water. When the ice melted in the spring, the rocks weighing it down shifted position, and the crib plunged to the bottom on its side. As a result, the crib towered 12 feet from the bottom. Underwater it looked like a skyscraper. Fish flocked to the crib and occupied various stories from top to bottom. A long, dark shadow fell on one side and served as a magnet for fish. In short, the structure turned into an amazingly effective accidental home. Another crib of the same dimensions fell nearby as originally intended but, since it ranged only four feet from the bottom, it attracted only a fraction of the fish the skyscraper did.

Complexity of Design

Since this is not an article about building cribs, I won’t go into the blueprints on how to construct them. The key element in one word is complexity. This refers to the guts of the crib, not the frame. The interior brush should be packed tightly enough to block out most light. Don’t worry about making it so dense that fish won’t be able to get inside. Pockets will form here and there, and fish are astoundingly adept at squeezing into the tiniest spaces. Long branches should extend from the crib on all sides and through all the slats. If possible, include some long branches stuck into the top of the crib to give it some extra dimension. The idea is to create as thick and complex a jungle as possible. The final result will resemble a thick mass of long branches extending from the dense pack inside the crib. The branches should reach from every depth of the crib in every direction and at every possible angle. If your finished crib looks even vaguely tidy, it needs more work.
View from Inside a Fish Crib (c)Eric Engbretson

Designs that Don’t Work from Day One

Cribs that incorporate Christmas trees work adequately but for a very short time. Christmas trees deteriorate so quickly that in just a year or two, they no longer provide the complex cover that fish desire. In addition, fish will ignore cribs that are too small, too short, or too simple in design.

Examples of poor designs are cribs made of wooden pallets that rest only a couple of feet off the bottom, or cribs with huge spaces between pallets and no interior brush. Star-shaped cribs that resemble the obstacles used on the beaches of Normandy in World War II may look fascinating, but they lack the complexity, shade, and cover to attract fish well. This list is scarcely exhaustive: There are many other design flaws in cribs that don’t attract fish.



When it comes to location, success depends largely on depth. When cribs are placed shallow enough to let sunlight reach them, they grow algae and other organic material. This serves as a food source for juvenile fish and also makes the cribs fuller and denser. When cribs are placed closer to the littoral zone, they’re much more accessible to the newly hatched fry that will quickly colonize them and provide the food that attracts larger fish.
When I’m scuba diving, I see fish cribs in deep water go largely unused most of the year. The water is colder here and may lack adequate oxygen. In general, these cribs receive visits by fish in fall and winter. On the other hand, fish in shallower water will use a crib virtually year-round. Some of the best fish cribs I’ve seen were ones that weren’t properly weighted. When the ice melted, they floated toward shore and ran aground. When allowed to remain in place, these cribs were quickly covered by algae and were populated immediately by juvenile fish and newly hatched fry. Despite their extremely shallow location, they attracted game fish year after year and even served some fish as a structure for spawning.

The Substrate

Cribs should always be placed on a hard bottom or substrate. If placed on a lake bottom with 12 inches of muck, let’s say, the crib will sink into the muck and you’ll effectively lose a foot of height. Since height is vital to fish, you don’t want to lose it. A muck bottom also eliminates the basement floor.

The Basement Level

Another reason a hard bottom matters is that you want about a foot of clearance between the lake bottom and the base of the crib. If fish can swim underneath your crib in this basement level, you’ve really got something to brag about. Walleyes and bass, by the way, are two species especially drawn to cribs that let them swim underneath.


If the crib rests in shallow water where plants can grow, it’s often possible to extend the life of the crib almost indefinitely. As multitudes of fish congregate around the crib season after season, their feces can accelerate a lush growth of plants. This patch of vegetation is denser than the surrounding area and creates desirable habitat all by itself. In time, after the interior brush decomposes, it’s possible that tall aquatic plants will replace it, a process that prolongs the lifespan and effectiveness of the crib. If the crib sits in water that’s too deep for plants to grow, none of this growth will take place.

Multiple Cribs in One Location

Cribs located close to each other always outperform single units. Fish will often travel back and forth in a cluster of cribs. Even if they are built alike and placed at the very same depth, they form individual identities, and multiple cribs will be used by different species in various ways. For example, one crib may attract many more rock bass than another that is just a few feet away and populated mainly by sunfish. The differences in the cribs are largely indiscernible to our eyes, but the fish notice subtle distinctions that drive their preferences. The rule, then, is simple: Multiple cribs offer multiple choices and greater numbers of fish.


The regulations on the placement of fish cribs are mandated by Natural Resources Departments in many states and other jurisdictions. In my state, Wisconsin, permits for fish crib construction and placement explicitly instruct builders to place them with at least five feet of water over the top of the structure. Since the cribs themselves are typically four or five feet high, the minimum depth for placement is nine or ten feet. The concern here is understandable. Cribs can create hazards for boaters, who may be unaware of their locations. However, if I were placing cribs on my own private lake, free from regulations, I would place them shallow enough so that only two or three feet of water covered the top. This way, I might be able to replenish them with new brush from time to time as the older material disintegrated. This would greatly extend their natural lifespan.

The Future of Artificial Fish Shelters

In recent years, fish-crib makers have gotten very creative and used a variety of materials. Most popular of the new wave of materials are things normally destined for the junk pile or landfill. Today it’s not unusual to see fish cribs made of stacked wooden pallets, plastic, or PVC. They feature clever designs, and I’ve seen some of them underwater in lakes that I frequent. But the truth is that they don’t seem to fare well. While they may be lighter, easier, and cheaper to make, their main drawback is that they lack the size and complexity to prove attractive to fish. The best ones take up the most space and most effectively mimic trees, sunken timber, and other natural elements.

When artificial cribs made of PVC pipe first appeared, it was widely believed that they would be less effective because fish would refuse to be silhouetted against a white background.  Although I also originally believed this, I've reversed my position.  What we've discovered in further studying this is that color doesn't seem to be the significant factor we once thought it was.  In fact, there's evidence that suggests that PVC pipe color plays no role in fish preference whatsoever.  Instead, the combination of vertical height and complexity determine whether any structure, natural or artificial, will be attractive to fish.

An example of a poorly constructed fish attractant.  Notice the lack of complexity and the large open spaces that provide shade, but nothing in the way of cover. @Eric Engbretson Photo


Fish Cribs as Fish Habitat

Let’s get one thing straight. Fish cribs are definitely not fish habitat. They’re artificial constructions designed to concentrate unusually large numbers of fish in a very small area so fishermen can catch them. Fish cribs do not normally provide the elements fish need for spawning or nesting. At their best, fish cribs merely impersonate fish habitat. In fact, in lakes with an abundance of excellent fish habitat, even the best- made and best-placed cribs will go ignored by fish in favor of superior natural structure. In sum, fish cribs work best in lakes where there is little or no natural structure for fish to use.

Traits of Effective Cribs

·They reside in relatively shallow water (10 to 15 feet)

·They receive ample sunlight and they support algae and other organic growth

·They are in water that is shallow enough to let submergent plants grow nearby

·They sit on a hard bottom

·They are at least four feet high

·They have a space at the base that lets fish swim under the crib

·They are thickly packed in the center with various sizes of brush and branches

·They have long and complex branches on all faces extending away from the crib

·They have a complex design

·They are placed together with other cribs

·They are in lakes that contain little or no natural structure

Traits of Ineffective Cribs

·They sit in water that’s too deep (or too shallow if the water’s too warm for fish)

·They sit too deep to receive ample sunlight and support organic growth

·They are in water too deep for plants to grow nearby

·They sit on a mucky bottom

·They are less than four feet high

·They have no space at the base where fish can swim under the crib

·They contain Christmas trees or have little or no brush packed into their center

·They have a design of limited complexity

·They are placed alone

·They are in lakes with abundant natural habitat and structure


As with any set of guidelines and suggestions, there are always exceptions. My observations and conclusions come from years of scuba diving in the northern lakes of the upper Midwest. While complexity of design is universally important, in other parts of the country, many of my suggestions on placement may ignore local conditions and require adaptation. For example, in large southern reservoirs, water temperatures can soar into the 80s and force fish to spawn and live in far deeper water, where lower and more comfortable temperatures prevail. In very clear lakes, sunlight may penetrate 30 feet or more, and plants can grow at greater depths than in other locales. In lakes like these, specific local conditions must be taken into account. Because of such variables, it’s important to have a good understanding of your lake’s ecology and other characteristics. Understanding the specific dynamics of any given lake will help immeasurably when you decide on the best locations for a crib.



Thursday, May 16, 2013

Monday, March 4, 2013

My Best Advice For New Underwater Photographers

There’s always room for more good photographers, and I think interest in underwater subjects will continue. I encourage beginners to learn about their subjects. Become an expert on the life and behavior of your animal subjects. Become a steward of their habitat. Think of yourself as a PR person for that particular animal. If you do this, you’ll show them in the best light, you’ll be mindful of disturbing them, and your work will automatically show these creatures at their most magnificent. Don’t sell pictures. Instead, fall in love with your subjects and sell that love! And instead of exploiting them for personal profit, you’ll become partners with them in calling attention to their inherent beauty and value in the ecosystem, and the special problems each one of them face in an increasingly crowded world.

Engbretson Underwater Photography is always on the look-out for talented underwater shooters.  If you work in freshwater environments and you're interested in joining our team contact us today.

Sunday, February 3, 2013

What are the Clearest Lakes in Wisconsin? 2012

I was talking to Jennifer Filbert at the Wisconsin DNR the other day.  Jennifer manages the data for the state-wide citizen's lake monitoring group.  They're a network of individuals, usually lake-front property owners who monitor and regularly take a variety of water samples from lakes all across Wisconsin.  The data they compile helps to give us a look at how our lakes are doing. One of the many tasks lake monitors perform is to take regular sechi disc readings.  This is a universal way of assessing and comparing water clarity.  I was interested to know which Wisconsin inland lakes were the clearest.  Jennifer sent me a spreadsheet of some really comprehensive data and I thought it would be interesting to pass this along.  Here are the lakes that recorded the highest average water clarity in 2012.  In short-here are Wisconsin's clearest lakes and their average water clarity in 2012:

1) Black Oak Lake-Vilas Co.-35 feet
2) Wazee Lake-Jackson Co.-30 feet
3) Keyes Lake-Florence Co.-27 feet
4) Maiden Lake-Oconto Co.-27 feet
5) Lake Owen-Bayfield Co.-25 feet
6) Stormy Lake-Vilas Co.-25 feet
7) Blue Lake-Oneida Co.-24 feet
8) Presque Isle Lake-Vilas Co-24 feet
9) Mildred Lake-Oneida Co.-23 feet
10) Boot Lake-Oconto Co.-22 feet
11) Lake Lucerne-Forest Co.-22 feet
12) Whitefish Lake-Douglas Co.-22 feet
13) Deer Lake-Polk Co.-22 feet
14) Pike Lake Chain-Bayfield Co.-21 feet
15) Sand Lake-Burnett Co.-21 feet

(Note: To see an updated list of 2013, click here.)

Wednesday, January 2, 2013

How Do Spawning Benches Work?

Spawning Bench or half-log. (C) Eric Engbretson

In northern states, fish managers sometimes use spawning benches to promote the spawning of smallmouth bass.  While largemouth bass, rock bass, and sometimes bluegill also use spawning benches, it is the spawning of smallmouth bass that inspired the design. 
In a healthy lake, smallmouth bass build spawning nests against rocks, sunken trees, or large pieces of wood in about four to ten feet of water.  Next to these structures, the male excavates a shallow, circular crater in the lake bottom.  This system provides good natural protection to eggs and fry. 
But in lakes without coarse woody habitat, large rocks or similar objects, smallmouth bass may be forced to construct their nests out in the open.  When spawning and is over and the female has deposited her eggs in the nest, the male diligently guards the eggs and later the fry from predatory fish and crayfish.  When the nests are out in the open without natural protection, the male must guard up to 360 degrees of the crater he has dug.  This is exhausting and dangerous, since his back is always turned away from part of the nest.  Far fewer eggs incubate, and far fewer fry survive their first few weeks when fish have to use nests that lack the natural shield of a habitat's woody elements. 
Fish managers have studied the hard work put in by bass and have noted the decreased recruitment of young fish.  The managers came up with an idea for a simple structure they hoped would meet the needs of nesting fish and make it easier for eggs and fry to survive.  The idea for spawning benches was born. 
A spawning bench consists of a four to six foot piece of log sawed lengthwise in half and attached to concrete or cinder blocks on each end.  Spawning benches are therefore sometimes called half-logs.  Once placed on the suitable substrate, the spawning bench provides overhead cover from birds of prey.  The concrete blocks on each end protect the nest from raiders on two sides.

Smallmouth bass guarding nest built adjacent to one of the concrete blocks of a spawning bench. (c) Eric Engbretson
It was a sound design and one that smallmouth bass readily used, but not exactly as intended.  It turned out that smallmouth bass weren't concerned about overhead cover. The benches usually sat in water deep enough to preclude threats from above by ospreys and other birds of prey.  While nests are occasionally built between the two concrete blocks as the designers intended, smallmouth bass usually construct nests next to one side or the other, thus allowing the male to guard the nest from only three sides.  The key element seems to be the concrete block itself and not so much the half log.  In fact, if the spawning bench falls on its side, it still provides excellent protection. 
Spawning benches are poor substitutes for the naturally occurring woody cover that fish prefer.  But in lakes devoid of suitable wood, rocks, or trees, spawning benches provide a superb means of helping smallmouth bass defend their nests and allowing more of their offspring to survive.