Showing posts with label fish. Show all posts
Showing posts with label fish. Show all posts

A Mermaid? No a Dugong!

Early traditional legends describe mermaids:  supernatural beings that lived in the sea, a combination of human and fish. As time went on, they were described as having a human body and a fish’s tail. But where did the mermaid legend come from?  For centuries, sailors travelled the oceans and returned to their homelands with tales of exotic creatures from distant shores, one of which was the mermaid. These sailors had been on the high seas for months. They may have been dehydrated, suffering from sunstroke, ill or simply lonely.  They saw creature with smooth bodies and long flowing hair swimming through the water. Mermaids!
Mermaid enticing a ship at sea
Of course to our eyes a dugong (Dugong dugori) does not look much like a mermaid. But to a lonely sailor with the sun in his eyes, these graceful aquatic human-like creatures could have captured the imagination. The long flowing hair was possibly sea grasses, which the dugong feeds on.  In an early record in his book, A Voyage to New Holland, the explorer Captain William Dampier wrote in 1699 about a shark that his men had caught, slaughtered and ate.b He describes that in the mouth of one:
".. . we found the head and bones of a hippopotamus; the. hairy lips of which were still sound and not putrfied, and the jaw was also firm, out of which we plucked a great many teeth, 2 of them 8 inches long and as big as a man’s thumb, small at one end, and a little crooked. . ."
Dampier was describing a dugong. In an earlier book from 1688, A New Voyage Around the World, he writes of the dugong’s close cousin, the manatee:
"This creature is about the bigness of a horse, and 10 or 12 foot long. The mouth of it is much like the mouth of a cow, having great thick lips. The eyes are no bigger than a small pea; the ears are only two small holes on each side of the head. The neck is short and thick, bigger than the head. The biggest part of this creature is at the shoulders where it has two large fins, one on each side of its belly."
In Dampier’s time, there were many natural discoveries being made in yet undescribed lands like New Holland (Australia). Even though there are no hippopotamuses in Shark Bay, Western Australia, Dampier can perhaps be forgiven for thinking there were. Dugongs are more closely related to hippos and elephants than they are to marine mammals like whales and dolphins.
Dugongs, manatees (Trichechus spp.) and the extinct Steller’s Sea Cow (Hydrodamalis gigas) are in the animal order Sirenia, named for the beautiful sea sirens of classical mythology, a sea nymph, part woman and part bird. Legends tell of sea nymphs bewitching sailors with their siren song, luring ships to a shattering end (in rocky seabeds. Maybe the bewitching sound that entranced the lonely sailors was the whistling sound made by the large, strong male dugongs to keep their herds together.
Dugongs are large creatures, up to 3 metres long and weighing 400 kilograms. Even though they have small ears and eyes, their hearing and eyesight are excellent. Their heads are round and the mouth on then large fleshy snout faces down towards the seabed, which makes it easy for dugongs to feed on their favourite food - the young shoots of sea grasses. These grow in the muddy beds of shallow waters in northern Australia. Because they graze on sea grasses, dugongs are commonly called sea cows. Dugongs also have moustaches - heavy bristles that are excellent tor helping find the sea grasses in the murky water stirred up when they tear out the whole plant, roots and all. They manoeuvre the sea grasses into their mouths with their sensitive upper lip.
Dugong swimming with fish
These marine oddities are slow and graceful. They steer and balance with their front flippers using them to ‘walk’ as they graze. They have a fluked or ‘wing-shaped’ tail which beats slowly up and down moving them through the water. Adult males and some elderly females have tusks. These are useful weapons for males during breeding season, when they need to fight off competing males.
Dugongs are slow breeders, giving birth under the water to only one pup about every three years. The calf often rides on the mother’s back or swims nearby; never straying far. They suckle for up to 18 months from the teats close to the base of die flippers. The calf begins feeding on sea grass within a few weeks of birth and remains with the mother until it is nearly the same size as her and is fully weaned. Its place will then be taken by another pup.
 Australiana by Ty Buchanan 
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Blue Bastard Caught!

A mystery fish is caught time-to-time in northern Australia. It was enthused about then thrown back to be forgotten until another recreational fisherman snagged an example. The fish was nicknamed the blue bastard in the usual Aussie way. Serious scientists who wanted to catch it couldn't, no matter how hard they tried.
Blue Bastard fish Plectorhinchus caeruleonothus
Jeff Johnson, an ichthyologist, decided to take the case into his own hands. He hired Ben Bight a Weipa fishing guide to go out and catch the freaker. Specimens were caught and sent to Brisbane where Johnson and geneticist Jessica Worthington got to work on them. The fish already had a name: Plectorhinchus caeruleonothus. Little was known about it, however.

The Blue Bastard grows to a meter in length. Juveniles have black and white stripes with a yellow tinge. Adults change to a pleasant gray-blue. They are territorial, showing aggression by rushing at each other then locking jaws in a struggle.

Living in the shallows it would be thought that they are easy to catch. This is not the case. They are picky and seldom bite a baited hook or spinner. A new tourist industry could develop: apparently, they are successfully caught by presenting a "fly" to them. As they are not endangered this is a serious proposition.
Biology by Ty Buchanan
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Weird Fanged Fish Found in Australia

Researchers on an Australian exploration ship got more than they bargained for when they searched an area near Sydney in New South Wales. They were examining lobster larvae but discovered something really snappy. On the sea floor near ancient volcanoes they found an odd fanged fish.
Snaggletooth dragonfish genus Astronesthes
The tiny fish a bit larger than your thumbnail is as black as coal. While the fish has probably already been named in the snaggletooth dragonfish genus (Astronesthes) these fish have rarely been seen. There are ten fish species of this type located in the region. Further analysis will be need to find out if it is a new species.

The larvae of common fish such as flatfish, gurnard, kingie and Dolphin fish were also seen there. This surprised scientists who had previously thought that they were washed into the path of predators by the current. It seems the dragon fish came up from the depths to join them.
 
Biology by Ty Buchanan 
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Gold Fish Dog

"Come closer doggy.  We won't hurt you - much!"
Funny Animal Pictures
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Australian Fish Oil is Poison!

While glucosamine has priced itself out of reach of the average consumer, sales of fish oil are still booming. Just about everyone you bump into is on it. The problem is the world-wide market is not sufficiently policed to ensure a healthy product.
Cut prices for this popular addition to diet is a feature of the market. But are we paying the price? Tests show that the majority of packaged fish oil is contaminated and labels stated omega-3 fatty acid at much higher levels than reality. In other words suppliers are lying. Less than 10 per cent of tested sealed fish oil had the printed omega-3 fatty acid level.

Some capsules are downright dangerous to take. In 92 per cent of tested packages the omega-3 fatty acid had oxidised - that is "gone off". What is more frightening is that most fish oil comes from two first world countries, namely, Australia and New Zealand. What happened to the philosophy of only exporting the best? This is disgraceful.

International law is being broken here and the Australian government must do something about it. immediately. Our export reputation depends on stopping sales straight away. One poisoning out there will irreparably damage Australia's economy, ruining all the good work done. Just remember: one bad apple spoils the whole barrel.
Health by Ty Buchanan
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A Monster in the Water

There are some really strange things out there. Some animals are living fossils. They should have died out with the great extinction, but they survived and lived on.
The frilled shark looks more like an eel. Its mouth and teeth are enormous in relation to its body. It was caught for the first time in Australia by a fishing trawler. Fishermen had never seen one before.

Like the platypus it is a mishmash, having a tail like a shark with head and body like an eel. The animal can live in deep water as well as the shallows. This guy had a bad day. They usually frequent deep water. However, this one was swimming at 700 metres, the maximum fishing depth for trawlers.
Science by Ty Buchanan
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Another Use for Fish Sperm

Pollution is a big problem, particularly from industry which pumps unwanted metals into the soil just about everywhere in the world. Getting rid of this had been an issue looking for a solution for decades. The answer could be at hand from a very weird source.

Fish sperm has a property making it ideal for the purpose. It literally hoovers up the metal particles. The sperm contains high amounts of DNA. This contains phosphate which strongly attracts metals. The metal/phosphate compound can be taken out with neodymium magnets consisting of trivalent iron, dysprosium and neodymium.

In Italy herring sperm was first identified as being useful in cleaning up the environment. With salmon being bred commercially, it is seen as a better source of fish sperm. The substance has been thrown away as waste until now.
Science by Ty Buchanan
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Sharks Struggle in Freshwater

Sharks may seem to be invincible, yet they have some significant weaknesses. While some dolphins succumb to their attacks, acting as a group they can kill a shark by ramming it. Sharks
also have to keep moving otherwise they die.
Now it has been discovered that fresh water is their enemy. They get dehydrated and cannot remain alert. Breeding is out of the question in non-salty water. A terrific battle for survival ensues as sharks continually keep sinking.

The reason for this is that sharks do not have air bladders. This "device" enables fish to swim at mid-depths. Sharks use their oily livers to stay afloat - very inefficient. They have to work 50 per cent harder when they leave the sea.

Freshwater species of shark have refined the evolution of their livers. The organs are flatter than their ocean cousins. There is a penalty for a flatter liver. A fatter body means a less sleek body which makes river and estuary species slower. Even with fatter livers, they live close to the bottom of the water.
Biology by Ty Buchanan
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Fish Catch Cat

"Yeah, I caught them myself.  There are bites on a few of them."
Funny Animal Pictures by Ty Buchanan
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New Catfish Species in Australia

Carfish are fairly mundane creatures. If you are fishing and you hook one thinking it is a big pike you are annoyed when you drag it in, and "drag" it the defining word. They are usually a dead weight on the line.

On the other hand if you are a biologist all animals are of interest. A combined US, Australia team has discovered a new catfish species in North Queensland. It has a tail like an eel, not the usual fish-like tail. Apparently, people knew of its existence for many years and just assumed it was like any other catfish.

Tandanus tropicanus is cylindrical in body shape. It has a large head and tiny eyes. DNA tests showed that the fish is a distinct species. Overall, its body configuration is different from other catfish.

Unlike many catfish it is good to eat. Fishermen have been catching it for many years for food not knowing how unique it was. Despite the accumulation of human knowledge about the world there is a lot we still do not know about nature.
Biology by Ty Buchanan
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Spiders Eat Fish

It is commonly believed that spiders are land dwelling creatures that eat air breathing prey. However, this is a misconception. New research shows certain spiders eat fish.

These spiders exist on all continents except Antarctica. No less than eight kinds of spider consume fish up to twice their size. they also eat amphibians, mice, bats and birds.

The diving bell spiders lives underwater. Many spiders live on the edge of water bodies and will eat just about anything that can be caught. Some fish they catch are very large indeed. Spiders take the chance of a rough fight because nearly all of a fish is edible.

They hunt by holding on to something solid on the land with two of their rear legs. When a fish actually touches one of the six legs in the water the spider pounces completely leaving the land and bites the fish on the neck.

We do not know everything about nature. Much of the living habits of animals is still unknown. As time goes on and data are accumulated we will know more but never all of it.
Ethology by Ty Buchanan
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