|Devonikauden elämää meressä |
kuva University of Michigan Museum of Paleontology
And God said, “Let the water teem with living creatures, and let birds fly above the earth across the vault of the sky.” So God created the great creatures of the sea and every living thing with which the water teems and that moves about in it, according to their kinds, and every winged bird according to its kind. And God saw that it was good. God blessed them and said, “Be fruitful and increase in number and fill the water in the seas, and let the birds increase on the earth.” And there was evening, and there was morning—the fifth day.And so it happened..
Osteichthyes (osteo ikhthys bony fish) have bony skeleton supported by calcium salts. Sharks and their relatives have cartilage body without hard bony skeleton.
Bony fish are among the most fruitful among God's creations. Humans have recorded over 20.000 species, which is statistically highest among all vertebrates. Four-fifth of planet Earth is covered by water so there is room for many kinds of fish.
Osteichthyes are divided into 34 major subspecies
Bony fish have
- bony skeleton
- skin covered by scale (some exceptions)
- fin pairs
- tooth (some exceptions)
- gills protected by bony shields (operculum) Shark gills lack this.
Gills - oxygen in water
|Microscope image of fresh water fish gill surface |
Water has 50 times less oxygen (5gr in cubic meter of fresh water) then atmosphere (250gr in cubic meter of air). To get as much oxygen as possible into blood the gills must be very thin and folded (see more in wikipedia)
|The swim-bladder is another mircacle of creation|
So what you say! Having lost all your ability to wonder like a child, haven't you?
Guanine crystals inside the fish bladder?
Adam's children learned to know guanine from bird droppings in 1844 (sp. guano) and it is a valuable fertilizer on fields maintained by humans. (wikipedia)
Fish bladder does not smell all that well. However, Parisian master of fragrances, François Jaquin, invented in 1656 a method to use guano crystals to improve rose water. Today G-crystal is used for example in shampoos. This link gives an animated picture of the 3D sturcture of these crystals and more information about this wondrous organic material.
Miracles of Devonian life
After I have pointed out in very superficial way just some features of fish you are welcome to join me in wondering the bony fish, Osteichthyes, that begins to appear and then practically fills Devonian seas and fresh water sources.
If you are under the impression that modern evolutionary science has satisfactorily explained the origins of bones, scales, fins, gills and guanine-crystal plated swim bladders you still do not know as you should know!
"Now about food sacrificed to idols: We know that “We all possess knowledge.” But knowledge puffs up while love builds up. Those who think they know something do not yet know as they ought to know. But whoever loves God is known by God."
St Paul 1 Corinthians 8.1-3 NIV