Lighting up is the rule, not the exception, for marine fish

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But if scientists are able to incorporate the newly discovered enzyme, they may be able to activate photosensitive neurons with infrared light, which penetrates much deeper. “Just as the enzyme helps fish peer into murky water, it could help us peer deeper into the brain,” said Corbo.
The light is a lure, wielded by our champion of the weird-the deep-sea anglerfish.
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Feeding experiments were implemented during active periods in the night. Active periods (night) were defined above. All specimens were fed under illumination of a red LED (see above), illuminated in the left corner of the reef tank. The red light allowed non-luminous specimens to find moving food particles in the water current. A defrosted plankton mixture (mysid shrimp 5–10 mm length and lobster/fish eggs 1 mm diameter) was applied dropwise to the water column in approximately 5 s intervals. This resulted in a total volume of approximately 150 ml of defrosted zooplankton. Preliminary feeding tests were performed to avoid satiation effects. The school of A. katoptron was fed with 200 ml of defrosted zooplankton continuously in consecutive sessions without any signs of repletion. Do goldfish need light? Well, how would you like to be kept in the dark?!
Photo provided by FlickrTo add light to your fish tank, .
Photo provided by FlickrWhen an ostracod is swallowed, it emits a burst of light, making the cardinal fish spit it out.
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The fangtooth, also known as Anoplogaster cornuta, is another menacing looking creature that inhabits the deep waters of the ocean. Although it may look like a monster, it only grows to a size of about six inches in length. It has a short body and a large head. The fangtooth gets its name from the long, sharp, fang-like teeth that line its enormous, over-sized mouth. Its gruesome appearance has earned it the name, "ogrefish". The color of the adults ranges from dark brown to black. Juveniles look completely different. They are light gray in color with long spines on their heads. The fangtooth is an extreme deep-water species that lives at depths of about 16,000 feet. The pressure at these depths is intense and the water temperature is near freezing. Food here is scarce, so the fangtooth will eat just about anything it can find. Most of its meals probably fall from the upper depths of the ocean. The fangtooth is found throughout the world in temperate and tropical ocean regions including the waters off the coast of Australia.The deep sea angler, known also as Melanocetus johnsoni, is a grotesque-looking fish that lives in the extreme depths of the ocean. Its round body resembles a basketball, and indeed, it looks like it could easily swallow one. It has a large mouth likes with sharp, fang-like teeth. Its appearance has earned it a second name of "common black devil". Despite its ferocious appearance, the angler only reaches a maximum length of about five inches. The angler gets its name from the long, modified dorsal spine which is tipped with a light producing organ known as a photophore. Like many other deep-water fish, the angler uses this organ like a lure to attract its prey. It will flash its light on and off while waving it back and forth like a fishing pole. When the prey fish gets close enough, the angler snaps it up with its powerful jaws. A strange fact about the deep sea angler is the fact that the male is smaller and different in appearance from the female, which is pictures above. The male of the species is about the size of a finger and has small hook teeth, which it uses to attach itself to the female. Once attached, its blood vessels join with that of the female and it will spend the rest of its life joined to her like a parasite, getting all of its nourishment from her body. If the male is unable to attach to a female, it will eventually dies of starvation. The deep sea angler is found throughout the world at depths of over 3000 feet.The Deep Sea Dragonfish, or Grammatostomias flagellibarba, is a ferocious predator in spite of its small size. It is one of many species known to inhabit the deep oceans of the world. This fish grows to about six inches in length. It has a large head and mouth equipped with many sharp, fang-like teeth. The dragonfish has a long barbel attached to its chin. This barbel is tipped with a light-producing organ known as a photophore. The dragonfish uses this organ like a fishing lure, flashing it on and off and waving it back and forth. Once an unsuspecting fish gets too close, it is snapped up in the dragonfish's powerful jaws. The dragonfish also has photophores along the sides of its body. These light organs may be used to signal other dragonfish during mating. They may also serve to attract and disorient prey fishes from deep below. The Dragonfish lives in deep ocean waters at depths of up to 5000 feet (1,500 meters). They are found in most tropical regions around the world.Imagine descending into the ocean's depths in a submarine. At first, you are in a bright underwater world, full of fish, marine mammals, plankton, and coral reefs. This is called the epipelagic zone. As you move deeper into this alien universe and approach the depth of 200 meters, your surroundings become dark rapidly, and you can barely make out the shapes of organisms. You are now in the mesopelagic zone, the twilight zone. Below 1000 meters (bathypelagic zone), the underwater world outside your submarine window becomes completely dark. To reach the bottom of the ocean, however, you would still have to descend about four times as deep as you are now! Moving deeper into the blackness, you see a tiny light in the inky depths (abyssopelagic zone). What illuminates the ocean where sunlight can't penetrate? An animal that makes its own light — the anglerfish, a member of the Lophiiformes ! The anglerfish's light emanates from the end of fishing-rod-like extension on its forehead. It uses this surprising to lure prey out of the dark and close enough for its razor-toothed jaws to strike. The angling structure evolved from the spines of the fish's dorsal fin. The end of this structure is inhabited by large numbers of bacteria, which provide the anglerfish with its glow.