Drennon's Marine Gallery


"How many are your works, O Lord! In wisdom you made them all; the earth is full of your creatures. There is the sea, vast and spacious, teeming with creatures beyond number - living things both large and small"...Ps104:24,25

All photos, animated gifs and text copyrighted by Bill Drennon



Queen Angelfish

This adult queen angel fish was photographed in the Florida Keys where I use to work full time, but now work only part time during the summer.

This adult queen angel differs from the blue angel because of the crown on its head and its bright yellow caudal fin. It has undergone many hormone-generated color changes and lifestyle changes since birth. In its youth it was a parasite picker, setting up cleaner stations where it ate parasites off of larger fish. At that time, its body markings were almost indistinguishable form the blue angelfish. As an adult, it eats a mixed diet of algae and invertebrates. In this photo, it is swimming with its dorsal side up, but in caves, it often swims upside down! The buoyancy force of water counteracts gravity, so how a fish orients its backside is controlled by sight.


Christmas Tree Worm

I photographed this two-part, feathery feeding mechanism of a serpulidic polychate worm in the Florida Keys, but its range extends from Bermuda to Venezuela. These feeding "feathers",resembling a pair of Christmas trees, come in many different colors. Different colored plumes do not imply different species of worms. Rather, the large variety of colors are indicative of the great genetic diversity that the Creator bestowed upon this worm species. A yellow and blue plumed worm is the same species as an orange and red one . . . or any other color. What do these Christmas-tree bearing worms eat? They are detritophores. That is, their spiraling feather-like feeding mechanism grabs dead, rotting stuff. Even fish poop! Most of its nutrition comes from the fungus and bacteria growing on the surface of these small pieces of waste that it injests ."Yuck," you say? Come,now! You have eaten fungus and bacteria, too. You do so each time you consume a mushroom or a bite of yogurt.

Most text books proclaim the common earthworm as the typical example of a phylum of worms known as the annelids, or segmented worms. Actually, the earthworm is not typical at all! It is a bald oddity in the phylum. The class of marine worms known as the polychaetes yields the majority of worm species. The polychaete (Gr. "many hairs"} worm, seen in the above image, resembles an earthworm whose body is covered with hundreds of bristles. The bristles help hold the critter inside its tunnel home. This worm made its home out of limestone (calcium carbonate), nestled on a star coral (Monaster annularis) mound. Eventually, the coral polyps in close proximity to the worm will die from starvation. The worms plumes are more efficient at grabbing food than the polys' tentacles.

To photograph these worms, one obstacle must be overcome. These worms have light-sensitive "eyes". When I approach a worm with my camera, the ornate annelid detects my shadow and goes scurrying into its tunnel home, shutting its trap door behind it. I must confess that most of my worm photographs are plumeless. The worm was quicker than my trigger finger. I have a large file of trap door pictures. A photographer never knows if a worm shot was successful until the film is developed. The worm is quick to retreat, not only in the event of a shadow, but also with the flash from the camera strobe.


Brain Coral at Night

The yellow color of this coral colony comes from an algae known as zooxanthellae. It has a mutualistic symbiosis with the tentacle-bearing relatives of jelly fish, known as coral polyps. Through photosynthesis the algae makes abundant food with which it feeds the polyp. The algae act like a collective kidney for this primitive cnidarian, utilizing its wastes as fertilizer. At night the polyp extends its tentacles in order to grab the excrements emitted from the abundant fish that cruise the reef. This detrital matter provides the raw products for the zooxanthellae's synthesis of food. The algae benefits from the polyp tentacles in another way. The tentacles contain groups of stinging cells known as cnidoblasts which fend of would-be herbivores. The zooxanthellae would be quickly eaten if isolated on a rock surface.

Coral polyps are genetic clones of their parents, indeed of every ancestor that ever lived in its coral rock community. They live in limestone homes constructed on the tops of the abandoned abodes of their ancestors. The polyps in the above photo were living on a large rock colony built very slowly over many years. The amount of annual growth depends on the success of the algae crop for that year. Some years are good, some are bad. The average year produces a growth of only a few centimeters of added height.

What is the difference between brain corals and star corals? The answer lies in its density of polyp growth rather than on its genus or family. Sometimes two members of the same family can be a star coral and a brain coral, respectively. Star coral polyps live far enough apart that they can make individual flower-shaped homes. Brain coral polyps grow so densely packed that their homes run into each other. This produces a series of grooves, forming a maze effect. The living rock mound takes on the appearance of a human brain, hence the name "brain coral". Actually, it has the intelligence of some of my students. (Just kidding! Honest!} The truth is star corals live in low-density, single home dwellings whereas brain corals prefer condominium living!


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UNDER CONSTRUCTION: There is more coming.

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