Electroreceptors of Paddlefish

Electroreceptors of Paddlefish

The American paddlefish is an interesting but relatively unknown fish species. These fish have large paddle-shaped appendages on their foreheads, and they inhabit the murky waters of the Mississippi River and its tributaries. They can grow to six feet (183 cm) and weigh 150 pounds (68 kg). So what is the purpose of the paddle? The electroreceptors of paddlefish answer that question.

You might think that the paddle is a device to dislodge food from river bottoms. Some people called them “shovelnose fish,” assuming they used their paddles as a shovel. But paddlefish don’t dig for food, and lab experiments in 1993 showed the paddle’s real purpose.

Paddlefish are filter feeders that feed on tiny crustaceans and insect larvae that drift through the water as plankton. Many whale species are filter feeders that use comb-like baleen in their mouths to strain their food from the water. Paddlefish have comb-like rakers in their gills. They swim with their mouths open and filter their food from the water. But that doesn’t explain the paddle.

Paddlefish have poor eyesight and no sense of smell, so how do they know where to swim to find food? The paddle is covered with tens of thousands of electroreceptors that can sense extremely minute electric fields. Plankton emit signals that are similar to what doctors measure in electrocardiograms. Paddlefish use their electroreceptors to detect those signals and locate the plankton, even in murky waters.

The electroreceptors of paddlefish are similar to those of the platypus found in Australia. Many marine fish, including sharks, skates, rays, and some freshwater fish, can use weak electrical signals for feeding and communication. Those fish don’t need light or clear water to eat and maintain a balance in the environment. This ability is not something that evolved in the paddlefish because fossil evidence seems to indicate that they had electrosense ability very early in Earth’s history. We are amazed by God’s designs that we see in living things.

— John N. Clayton © 2020

Rivers Are Essential

Rivers Are EssentialThose of us who live near rivers are both blessed and cursed. My house here in Michigan is located just 30 feet (9.1 m) from the St. Joseph River. In the almost 25 years that we have lived here, the river has flooded a dozen or so times. Twice we had water in our basement requiring a major effort to avoid damage to our library, our TV recording studio, and our packing room. Despite the challenge, rivers are essential to life.

A large percentage of all flooding results from human mismanagement. Black-topping many square miles of sand, gravel, and dirt has caused rapid water runoff where it previously soaked into the ground. Building homes and businesses on flood plains has contributed to the damage and in some cases loss of life. (Our house is not on a flood plain.)

On the other hand, there is beauty and peacefulness that being near a river provides. For many of us, that makes it worth the risk. Humans have used rivers extensively for thousands of years. Two-hundred years ago, rivers were the primary method of transporting goods and people. But there are some things that rivers do that are less obvious and which are an essential part of the design of the Earth.

Rivers above and below the ground carry water for us to use. They take water to places where it would otherwise not be available in significant volume for agriculture and animal life. Good examples of this are the Colorado River, the Rio Grande, the Nile, and the Euphrates. Rivers are essential for us to live on this planet, and flooding is a part of that.

One of the great rivers of the world was the Teays River. (Pronounced Taze) The Teays River got its name from the village of Teays, West Virginia. (Although the village of Teays did not exist at the time the river was there.) When it was at its greatest volume, The Teays River was a mile wide and flowed from what is now Blowing Rock, North Carolina, northward through Virginia, West Virginia, Ohio, Indiana, and Illinois where it joined the Mississippi River. At that time, the Mississippi was as much as 25 miles wide in places.

The Nile River in ancient Egypt flooded every year and laid down topsoil making Egypt the breadbasket of the ancient world. Remember where Jacob sent his sons to get food when there was famine? (See Genesis 41:56-42:5.) The Teays River was a typical river. It flooded from time to time laying down rich topsoil. The flooding of the Teays River deposited the black farmland of Illinois.

Rivers are essential to life, and that includes the Teays River. Did you say you never heard of the Teays River? What happened to it? More on that tomorrow.

— John N. Clayton © 2019

Lessons from a Flood

Lessons from a Flood
As I write this, I am in a state of shock at what has happened to me during the past five days. Our home and main office are located on the banks of the St. Joseph River. The front door of the house is normally 20 feet above the surface of the river, and in the 20 years we have lived here, we have never had a problem with flooding. Many years ago we had water in our basement, but it was only 1 or 2 inches, and outside of wet rugs there was little damage. This time I have learned some lessons from a flood.

In early February of this year, we had some very heavy snow and the third week of February we had record rains as well as record warmth. The result of all that water was what is now being called a 500-year flood. My library, recording studio, fossil collection, and packing area are now full of water in spite of three new sump pumps operating at full capacity. It will take many months and some expense to get back to full operating capacity.

Our local television personalities have done a lot of hand-wringing, and I have heard more than one reporter say, “Why did God let this happen?” One religious writer proclaimed that the flooding of our area, which included a movie theater, was God’s retribution for the theater showing x-rated movies. Several years back there were those who explained flooding of the Mississippi River as God’s punishment for floating casinos on the river. Ridiculous as most of these claims are, there are some apologetic arguments and theological points that need to be understood.

God does not use natural disasters as disciplinary tools. There is a difference between physically afflicting someone and allowing the natural consequences of something to happen. When I was a child, my parents took me to the Indiana State Fair. I wanted a big cone of cotton candy, but my mother loudly told me I couldn’t have it. After a lot of whining and pouting, she finally said, “Ok, go get it but it will make you sick, and you’ll regret it.” I was allowed to suffer the consequences of my action, but I was not physically prevented from eating it.

In Deuteronomy 28, God does the same thing with the Israelites. In the first 14 verses, He tells Israel the blessings of living as God calls them to live. In the next 54 verses, God tells them of the consequences of rejecting His teachings. God doesn’t physically strike Israel, but He allows the natural result of human choices to happen.

There are more lessons from a flood, and I will continue my thoughts tomorrow.
–John N. Clayton © 2018