fish Archives - Page 2 of 3 - DOES GOD EXIST? TODAY

May 11, 2020May 17, 2020

How a Fish Drinks Water

Have you ever wondered how a fish drinks water? Your first reaction is probably something like, “It opens its mouth.” Like most things in life, it isn’t that simple.

All living things necessarily have some saltwater content in their bodies to keep chemical balance allowing life to exist. The fluids inside an ocean-dwelling fish are only about a third as salty as the ocean itself. The water inside the fish’s body tends to leave by osmotic pressure, which is the tendency of fluids to move through membranes toward higher concentrations. To avoid this loss of water, the fish does simply open its mouth and drink seawater. But that brings large amounts of salt into the fish’s body. The salt concentration would be more than the fish’s kidneys could handle. To aid the kidneys, the gills of ocean fish are designed to expel salt, so the fish isn’t pickled by it.

In freshwater fish, the osmotic pressure is reversed, so the fluids inside the fish are saltier than the water outside. The skin of a freshwater fish is designed so that water seeps in through its skin and gills. Therefore, the fish doesn’t have to drink at all. When a salmon leaves the ocean and enters a freshwater stream, it merely stops drinking. Like freshwater fish, it depends on its skin to bring in its water needs.

Now that you know how a fish drinks water, the next question would be about other creatures that spend their time in the sea. Birds like albatrosses and petrels can spend more than a year at sea, and whales and seals live in the ocean 24/7/365. How can they avoid being poisoned by the salt? We’ll discuss that tomorrow.

God’s design of life includes fitting living things with specialized equipment to survive in every environment. Fish are remarkable creatures specially equipped for the waterworld in which they live.

Data from National Wildlife magazine June/July 1995, pages 30-34.

March 30, 2020March 29, 2020

Four-Eyed Fish – Anableps

Throughout the natural world, we see special design features that allow animals to survive in environments that place unique demands. Chameleons have an eye-brain connection that enables the eyes to rotate independently of one another or work together when needed. Chameleons use their tongues to catch insects, but to capture their food, both eyes must work together to overcome depth perception issues. At the same time, chameleons are very vulnerable to predators, so their eyes must rotate independently to look in several directions at once. We find another example of unusual eyes in the genus of four-eyed fish, Anableps.

Anableps live in northern South America and Trinidad, where they swim in the surface waters of lakes and rivers. Near the surface, they are easy prey for birds, so they need to see above and below the water simultaneously. They appear to have four eyes, two above the water surface, and two below the surface. In reality, they are not separate eyes. The eyes are divided into two sections, separated by a band of tissue.

Each section of the Anableps eyes has two corneas, two pupils, a single egg-shaped lens, and one retina that is also divided. The portion of the eyes located above the water connects to a different section of the fish’s brain than the area below the waterline. These four-eyed fish are ideally suited to fill an ecological niche that no other fish can.

You might think that all fish could use this design, but every ecological niche has animals designed to inhabit and maintain that location. Anableps are unique, and that makes them popular aquarium fish. More importantly, this unique design speaks of God’s imaginative creativity in providing full use of every resource on planet Earth with creatures like the four-eyed fish, Anableps.

October 4, 2019October 1, 2019

Ocean Treasure House

Oceans are essential for life on Earth. As we learn more about the oceans, we realize more and more how important the ocean treasure house is to our survival.

Fish, shrimp, and lobsters are some of the blessings that come from the oceans. Those vast bodies of water contain a great wealth of biomass that can address human food needs. The very fact that these forms of life lay millions of eggs that can provide massive amounts of food quickly is a testimony to the vast ocean treasure house. As humans conserve and farm these resources, we see the potential for food production with minimal environmental impact.

But food is only one of the blessings that come from the oceans. The oceans of the world provide water for the land. Evaporation lifts massive amounts of water from the oceans. The moisture condenses and falls on the continents providing the vital water needed by all land forms of life.

The oceans also moderate temperatures on the land. When Earth is closest to the Sun, its tilt exposes the Southern Hemisphere to the direct radiation of the Sun. Since oceans mostly cover the Southern Hemisphere, the water reflects much of the radiation, and the rest is absorbed and stored in the water. The water carries this heat toward the polar areas of the planet, moderating temperatures and allowing life to exist in abundance at the higher latitudes.

When the Earth is at its farthest distance from the Sun, the Northern Hemisphere is tilted toward the Sun, exposing the land to the Sun’s radiation. The land surface absorbs more heat radiation and reflects less of it. The waters in the Southern Hemisphere moderate the climate by using their stored energy to supplement the heat from the Sun.

In addition to their thermodynamic uses, the oceans also control the gases that are critical for life on Earth. Photosynthetic processes taking place in the oceans produce most of our oxygen. The oceans are a significant carbon sink, reducing the amount of carbon dioxide that would be in our atmosphere if the oceans did not exist. This not only restricts the adverse greenhouse effects of carbon dioxide but also recycles carbon in ways that benefit the entire planetary ecosystem.

Another ocean treasure house is the minerals they hold. The salt in the ocean is not just sodium chloride (regular table salt). The oceans contain a wide variety of elements that are critical to humans. They include iodine, magnesium, copper, and copious trace elements of biological importance. People who live far from the oceans benefit from these mineral resources because ancient oceans have deposited those minerals on land. Oceans gather and store the elements that humans need. While we have mined these ocean-deposited resources on land, we are now learning to take them directly from the ocean.

As science looks for life elsewhere in the cosmos, it is not likely that we will find it unless we find a planetary environment with oceans comparable to those on Earth. The ocean treasure house is a beautiful feature unique to planet Earth in our solar system. As science observes other stars and other systems, it becomes increasingly clear that planets like ours are exceedingly rare at best. God has provided the ocean treasure house that speaks eloquently of the Creator’s wisdom and power.
— John N. Clayton © 2019

September 27, 2019September 26, 2019

Ghostly Seadevil Finds a Mate in the Dark

More than a mile (2250 meters) below the ocean, there is a world of darkness. Finding a mate in that dark place could be a challenge, but a species of anglerfish with the scientific name Haplophryne mollis has the problem solved. The solution is to keep your mate permanently attached. The so-called ghostly seadevil finds a mate in the dark and doesn’t let go.

The female sends out pheromones, chemicals which attract the males. The males, which are much smaller than the females, have a keen sense of smell to detect the pheromones in the water. Ghostly seadevils are called anglerfish because they have a “fishing lure” in front of their face to attract other fish which they eat. In the case of the ghostly seadevil, only the female has the lure, and it’s bioluminescent, meaning that it glows in the dark.

Once the male has detected the pheromone, he looks for the glowing lure. He examines the shape, color pattern, and flash pattern of the lure to tell if this is a female of his same species. If it is, he clamps onto her with his teeth and doesn’t let go. Eventually, their skin grows together, and their blood vessels join. She provides his nourishment, and he fertilizes the eggs which she lays. The eggs float upward to the ocean’s surface where they hatch, and the larvae feed on plankton. As they mature, the seadevils migrate back down into the ocean depths and repeat the cycle of life.

This is a drawing because pictures are hard to get in the dark ocean. In this case, you can see that two males have attached themselves. You can also see the bioluminescent lure on the front of the female fish’s head, and that’s how the ghostly seadevil finds a mate in the dark. They have a “ghostly” appearance because their bodies are translucent like many creatures living in darkness. This cycle of life seems strange, but it has too many coincidences to be accidental. We think it shows the creativity of the God who designed life to survive everywhere on Earth.
— Roland Earnst © 2019

March 2, 2019March 2, 2019

Self-Awareness Test Passed by a Fish

Self-Awareness Test Passed by Cleaner Wrasse

One of the indicators that scientists use to measure evolutionary development is a test that determines whether an animal has an awareness of itself. The test involves placing a mirror in front of the organism and then observing the animal to see if it gives evidence that it recognizes that what it sees in the mirror is an image of itself. A recent report says that a fish can pass this self-awareness test.

Self-awareness has been used to categorize animals as having higher intelligence than others. Scientists have considered the mirror test to be the “gold standard.” Applying that test they have determined that great apes, bottlenose dolphins, killer whales, Eurasian magpies, and Asian elephants are all very intelligent and therefore highly evolved. Now a fish known as the cleaner wrasse passes the self-awareness test and must be added to the list.

Researchers in Germany placed a mark on the four-inch fish in a location that could only be seen in a mirror. The cleaner wrasses checked their reflection multiple times and then tried to remove the mark by rubbing their bodies on hard surfaces. With no mirrors, the fish didn’t try to remove the mark. When the mark was placed on the mirror, the fish ignored it.

We should note that the cleaner wrasse survives by inspecting larger fish for parasites and dead tissue. The larger fish waits patiently while the wrasse cleans it by eating what it finds. This mutual relationship protects the health of the larger fish while providing food for the wrasse. Symbiotic relationships like that can be more easily explained by design than by evolutionary theory. Since the wrasse is designed to look for unwanted detritus on the bodies of other fish, perhaps that is why it is keen to notice marks on its own body.

If self-awareness shows high intelligence, we must now add a fish to the list of intelligent mammals and birds. Dr. Alex Jordan reported that the fish “behaviorally fulfills all criteria of the mirror test.” Dr. Jordan says that either the species is self-aware or the gold standard test needs updating.

–John N. Clayton and Roland Earnst

Reference: The Week, March 1, 2019, page 20.

November 12, 2018November 8, 2018

Learn from the Animals

Learn from the Animals
We are frequently astounded by what animals can do. As science seeks solutions to problems such as having enough food, knowing how to avoid disasters, and solving medical problems, we frequently see the answers in the designed features of living things. There are many things we can learn from the animals.

How can we have enough food to feed everyone on this planet? One way is to take advantage of animals with high reproductive capacity. A female mackerel, for example, lays about 500,000 eggs at one time. We have relied on animals like cattle which have one offspring at a time, are environmentally unfriendly, and require massive energy to sustain. Many fish, arthropods and mollusks can reproduce massive numbers of offspring, need very little energy input, and give off little or no environmental hazards. Some of them even remove environmentally unfriendly materials.

Can we improve our vision and perhaps restore sight to people who are blind? Studies of the common dragonfly have shown that each eye has 30,000 lenses. Our one lens is limited as to what we can see. The way images are transmitted to the brain in animals allows multiple transmissions. We are learning from insects and chameleons how the brain can reconstruct a useful image from many separate images. A chameleon can move its eyes in different directions, and its brain can interpret the direction and identification of what each eye is seeing independently.

How can we make stronger materials? Beaver’s teeth are so sharp that Native Americans used them as knife blades. The structure of the tooth enamel in the beaver and how the teeth maintain their sharpness is an area where materials science researchers can learn from the animals.

Can we make better drones? Researchers are interested in how high-frequency wing beats can allow better control of flight. Tiny flies known as midges beat their wings over 1000 times a second – twice as fast as mosquitoes. We can even learn from the animals that are almost too small to see.

Examples like these challenge those who would attribute animal design to chance processes and survival of the fittest. The design engineering in the animal world suggests wisdom beyond that of humans. In Proverbs 8:5,22,35 wisdom speaks, “O you simple ones understand wisdom and you foolish ones, have an understanding heart. The Lord possessed me (wisdom) in the beginning of His way, before His works of old. For whoever finds me finds life and shall obtain the favor of the Lord.” Let us be wise as we copy the wise designs of the Creator.
–John N. Clayton © 2018
We invite you to follow our Facebook page which gives daily examples of design in animals and plants. Click HERE to see today’s post.

December 31, 2017September 13, 2018

Electrogenic Fish

To keep a balance among living things in the natural world, there have to be many ways for animals to get food. In lakes, oceans, and rivers this is especially difficult because of the amount of cover that exists in which small fish can hide. If small fish over-populate, they exceed their food supply and the whole ecosystem collapses. One way to keep balance is with a predator that is an electrogenic fish.

One of the agents designed into the ecological system is the existence of living things that send out electrical charges. Very little is understood about how this works, but new data is enabling us to understand how cleverly electrogenic fish are designed to enable them to find and eat forage fish.

The January/February 2018 issue of Popular Science (page 75) has an interesting article by Ken Catania, a professor of neurobiology at Vanderbilt University on his studies of electric eels. What he found is that when an electric eel discharges a high-voltage pulse, the nerve fibers in nearby animals are affected. If a small fish is swimming near the eel, it becomes frozen like a statue long enough for the eel to catch it. Even more interesting is the fact that the eel can make any creature that is nearby twitch when the eel fires off a blip of current. The eel can swim up to a clump of seaweed and fire off a pulse. Anything hiding in the seaweed, like a small fish, will reveal its presence by twitching.

Electrogenic fish are just one of many different systems in the ocean that allow predators to keep a balance in the sea. Everywhere we look in the creation we see the wisdom of God revealed “through the things He has made” (Romans 1:19-20).
–John N. Clayton © 2017

October 3, 2017October 5, 2018

Cormorants Find Fish in Muddy Waters

Several years ago a flock of cormorants arrived on the St. Joseph River near our home. The river was close to flood stage. The water was so muddy that you couldn’t see the bottom even if the water had been only an inch deep. Those birds demonstrated that cormorants find fish in muddy waters.

The birds landed in a large tree on an island in the middle of the river. Very soon after they landed, one took off and dove into the river. A minute or so later it came to the surface with a fish in its beak. For the rest of the day, we saw these fishing birds dive and catch fish, sometimes staying under water for a very long time. I wondered how they could do that because sight in the water was non-existent.

In the October/November 2017, issue of National Wildlife (page 8), there is an article explaining how cormorants and other fish-eating birds manage when the water is so loaded with mud that they can’t see. Scientists at the University of Southern Denmark have studied the hearing of the great cormorant. They discovered that this seabird has a specialized sense of hearing tuned to a very narrow frequency range. The frequency is the same as the sound produced by herring and sculpin fish as they swim in the water. Those fish are the primary prey of the cormorant and sculpin live on the bottom of water bodies where it is dark, and the water is often dirty.

There are over 800 species of birds that find their food underwater. Since these cormorants find fish in muddy waters, the scientists on this project predict that other aquatic birds also use specialized hearing to catch fish. We see this as another design that God gave these creatures for survival.
–John N. Clayton © 2017

June 19, 2017October 6, 2018

Few Can Fish

FEW CAN FISH? We saw the following article on the editorial page of the Phoenix Republic in December of 1991. We don’t know who wrote it, but we thought it was worth sharing with you.

Anyone Can Talk: Few Can Fish

Now it came to pass that a group existed who called themselves. Fishermen.

And, lo, there were many fish in the waters all around. In fact, the whole area was surrounded by streams and lakes filled with fish, and the fish were hungry.

Week after week, month after month, and year after year, those who called themselves fishermen met in meetings and talked about their call to go fishing.

Continually they searched for new and better methods of fishing and for new and better definitions of fishing. They sponsored costly nationwide and worldwide congresses to discuss fishing and hear
about all the ways of fishing, such as the new fishing equipment, fish calls and whether any new bait was discovered.

But the teachers did not fish; they only taught fishing. Some spent much time in study and travel to learn the history of fishing and to see faraway places where the Founding Fathers did great fishing in centuries past. They lauded the faithful fishermen of years earlier who handed down the idea of fishing.

Many who felt the call to be fishermen responded. They were commissioned and sent to fish. And they went off to foreign lands … to teach fishing.

Now it’s true that many of the fishermen sacrificed and put up with all kinds of difficulties. Some lived near the water and bore the smell of dead fish every day. They received the ridicule of some who made
fun of their fishermen clubs. They anguished over those who were not committed enough to attend the weekly meetings to talk about fishing.

These fishermen built large and beautiful buildings called Fishing Headquarters. The plea was that everyone should be a fisherman and every fisherman should fish.

One thing they didn’t do, however: they didn’t fish. All of the fishermen seemed to agree that what was needed was a board that could challenge fishermen to be faithful in fishing.

The board was formed by those who had the great vision and courage to speak about fishing, to define fishing, and to promote the idea of fishing in faraway streams and lakes where many other fish of different colors lived. Large, elaborate and expensive training centers were built whose purpose was to teach fishermen how to fish. Those who taught had doctorates in fishology.

After all, were they not following the one who said, “Follow me, and I will make you fishers of men”?

Imagine how hurt some were when one day a person suggested that those who don’t catch fish were really not fishermen, no matter how much they claimed to be. Yet, it did sound correct.

Is a person a fisherman if year after year he never catches a fish? Is one following if he isn’t fishing? If Christ were to return to this Earth today in physical form, would He find us fishing, or would he find us organizing, talking about fishing, and making plans to build the best Fishing Headquarters anywhere? – Anonymous

Is it true that few can fish? It’s up to you to decide.

April 18, 2017October 6, 2018

Symbols

Humans seem to enjoy using symbols for everything in life. Notice the emoticons and emojis used in electronic communication. It is interesting that the use of symbols to convey meaning is an attribute of humans that is not seen in any other form of life. Animals may use sounds or chemicals to alert others of their kind to danger, territory, or sexual availability, but these are not symbols. Sometimes symbols have different meanings to different cultures or even different generations. In my hippie days, holding up two fingers in a “V” meant “peace.” When I was first inducted into military service, the same symbol meant “victory” and indicated an intention to conquer. Symbols convey information, and as the deaf can demonstrate to us, they can even form the basis of complex communication.

Our use of symbols is a reflection of our spiritual makeup. We can create art, express ourselves in music, and worship God because we possess a soul which allows these unique forms of expression. The most mentally challenged among us can use symbols and rejoice in being able to do so.

Sometimes symbols and their use are unique to a particular time in human history. A classic example of this is the use of the cross. In today’s world, the cross is universally accepted as a symbol of Christianity. People wear crosses to express their personal faith. The cross is put on many buildings, Bibles, and along our roadsides. Steven Lemley in an article in Power for Today (January 2, 2017) points out that in the first century the cross was only a sign of the execution of guilty criminals. He reminds us that wearing a cross or having it adorn a place of worship in the first century, would be like us today wearing the image of a hypodermic needle used in executions. Many saw the cross as a stumbling block (1 Corinthians 1:23) or a sign of God’s weakness. Paul used the cross as a symbol of separating ourselves from the world (Galatians 6:14) as well as crucifying our sinful nature (Romans 6:6).

For the first century Christians, the outline of a fish was used as a symbol. The Greek word “fish” spelled out an acronym for “Jesus Christ, Son of God, Savior.” Archaeological discoveries of ancient Christian symbols display the fish and sometimes a young man holding a lamb. Today we see people with fish symbols on their cars. We also see the cross used as a symbol to remind us of the terrible suffering that Jesus endured, and the ultimate victory of Christ over sin. All symbols, even emojis, can remind us that we have an eternal spiritual nature that we can express in many ways. The use of symbols, worship, and prayer are uniquely human features reminding us that we were created in the image of God.
–John N. Clayton and Roland Earnst © 2017