In 1998, an cement ship was about to sail into Sydney Harbour . At this moment, the ship suddenly seemed to hit something and trembled violently. The crew hurried to the deck to check. saw a huge "fish head" with a strange appearance in front of the bow of the boat. The length and width of the "fish head" alone are more than 2 meters. Could it be that the head and its body were broken by the boat's handle? Finally, people dragged the ship into Sydney Harbour with the "Fish Head".
After inspecting the ship, people were surprised to find that the paint on the ship was actually scraped off by the fish's rough skin. But what's even more strange is that this fish is not hit with only one head left, but it has grown like this. This fish is rollover .
The overturned fish with only fish head
The overturned fish is the heaviest bone fish in the world, because its flat figure looks like a small car from a distance. In addition, fishermen often see it lying on the water side, hence the name the overturned fish.
And if you get close to it, you will find that this guy looks even more weird. It looks like it has only one big fish head, without a body, with small eyes and mouth on its head. Up and down the fish head are the dorsal and anal fins with symmetrical sizes. When swimming, it depends entirely on these two fins.
Its pectoral fin is located behind the eyes and cannot be seen without careful observation. As for the caudal fin? Sorry, no. The big fish head looks like the "skirt pleat" behind the tail fin. In fact, it is a "fake tail" fused from the dorsal fin and anal fin. It can be used to control the direction, but if you want to use it to swim, forget it.
There are several special names for the overturned cart, such as its Latin scientific name "Mola mola". The "mola" here means grinding stone in Latin . describes the overturned cart that is large and round, and there is no fish scales on the skin. It is rough and looks like the characteristics of a millstone , which has to be said to be very appropriate.
For example, " Sunfish ", this is because the overturned carriage likes to lie on the water side and rest while basking in the sun. Scientists speculate that sunbathing in can increase the body temperature of overturned snails and help them accelerate their digestion, and that some small fish and seabirds will also peck at the parasites on their bodies at this time.
and At night, the storm will emit a faint light, looking like the bright moon shining in the sea, so it is also called "moonfish" . However, these lights are not generated by the storm itself, but are derived from some glowing parasites on it.
is chewed by sea lion and it doesn't run away
This year's htmlOn October 18, the world's heaviest corpse was found in the Portuguese waters. It was 3.25 meters long, 3.59 meters high, and weighed 2.744 tons, setting a new world record in one fell swoop. author said, "This fish must be the king of the high seas when it is alive."
But I think the matter of "King of the High Seas" is up to date, because rollover is basically a "buffet" in the sea . There was a photo circulating on the Internet, A sea lion was holding a huge overturned cart and nibbled. The head of the overturned cart was nibbled into a big hole, but it was still indifferent. Why doesn’t the swooping away?
Because of their special body structure, the snails basically only have one big fish head, and swimming depends entirely on their dorsal fins and pectoral fins. These two fins are very stiff, and their body weight is calculated according to tons. makes their speeds reach only 4 kilometers per hour, which is probably not as fast as people walking. At the speed of , don’t think about running away.
Another reason is that Although their brains are so big, their brains only account for 0.03% of the body weight, and the chord nerves of fish are generally the same as the body length, but the chord nerves of the storm are only 3 cm long . Compared with their 3-meter-sized body, it can only be said that they are better than nothing.Most fish have some measuring lines for sensing environmental changes on both sides of their bodies, and there are no overturning. This made them slow down all the time, looking dull.
The body structure of the snail seems to be full of shortcomings, How did they survive and not become extinct?
In fact, the rollover is not completely without advantages. At least the huge body gives them enough defense. The whole body of an adult snail is wrapped in dense femoral fibers up to 15 cm thick, just like wearing a hard armor. It is said that in the 19th century, fishermen's children would use threads to make balls of the snail's skin to play with. If you want to eat it, it is impossible without a good tooth.
In the ocean, the natural enemies of adult swarms are only orca , sharks and sea lions, and a few large animals. However, the bones of the overturned thorns have more bones and less meat, and the fish left after being peeled accounts for only one-tenth of the total weight. Isn't it good to have the energy to eat other fish?
Only sea lions are often photographed attacking the overturned snail. If they cannot bite the skin of the overturned snail, the sea lion will bite off the dorsal fin and pectoral fin of the overturned snail and throw them to the water like a frisbee. When the killer whales encounter sunfish , they will go up and hit it, just hit it.
In addition to its strong defense, another advantage of rollover is their terrifying growth and reproduction ability.
From birth to adulthood, the weight has increased by more than 60 million times
Ordinary fish can produce millions of eggs at a time, but female fish with overturned trolls can carry 20 to 50 million eggs. records that females with the most eggs carry 300 million eggs on their bodies, which is the most prolific fish in the world.
The newborn stilt is only 2.5 mm in size, about the same size as a small stone. However, when they become adults, their body length can reach more than 3 meters. The weight is calculated by tons, and it has increased by more than 60 million times. This cannot be considered as gaining flesh, it is simply blowing a balloon.
Rolling Snake body size
However, Rolling Snake eggs are floating eggs and are often preyed by other fish. In addition, those who are not fertilized and die prematurely during their growth process, The chances of them growing to adulthood are only one in ten million.
Adult rollovers have a weird look, but their cubs are even more weird. They have a star-shaped transparent protective film, which makes people feel that someone has put a rollover into a plastic bag.
Newly hatched sunfish
This is actually because the rollover is related to the pufferfish. Although the adult rollover and the pufferfish don’t seem to have a half-cent relationship, some similarities can still be seen when young, there are spikes on the body, bulging belly, and tail fins. However, as they age, the rollover will gradually change 7 times, and their appearance will gradually become closer to the adult rollover, and in the end there is only one "fish head" left.
However, their mouths have always been the same as puffer fish, not large in size and cannot be closed, and the teeth fuse into a beak-like structure. 's huge body is matched with this "cherry mouth" that cannot be closed, and it is inconsistent no matter how you look at it.
In terms of food selection, the snail mainly eats some foods such as jellyfish , tube jellyfish, plankton, sponge seaweed. After all, with the athletic ability of a rollover, only these creatures with almost no athletic ability can eat it.
In order to eat, the overturned car will dive to a depth of 600 meters underwater to look for jellyfish. After the predation is completed, the overturned snail will float to the surface and bask in the sun to obtain heat.
However, jellyfish are really not hungry, so they have to hunt many times a day, and sometimes they have to dive more than 20 times a day. Many people say that the overturned car is a "lazy guy in the sea", but it is actually incorrect. They are not lying flat on the sea surface, but a combination of work and rest.
Postscript
Because the swimming speed is too slow, the overturned snails are often caught by people. Fishermen generally choose to let it go. First, the name makes the fishermen feel unlucky, and second, it is worthless.
There is a common name for the overturned snail called "Bride's Cry". means that the fish meat of the overturned snail looks a big piece, but in fact, once it is cooked, it will shrink very small. The bride in charge of cooking is worried that she was misunderstood by her parents-in-law and stole the fish meat, so she could only cry and complain, so it was called "Bride's Cry".
Their meat tastes hard to say. Some people think it is bland and tasteless, while others think it is delicious. It is said that there is a famous dish "Stir-fried Dragon Soup", which is made with the intestines of sunfish.
But if it is delicious or not, they have a lot of parasites on them. Cyclops will not only make seabirds and fish peck at these parasites, but will also jump out of the water and rely on the impact of seawater to remove parasites. There are forty or fifty species of parasites on a sunfish, which is quite scary.
Reference
"Sunbathing with sunbathing" Ke Tong
"Strange-shaped sunfish" Lin Changhua
"Fish with head but no body - Sunfish" Wang Yunxiang
"Ocean fish show their skills" Ma Xiaohui
"Sunfish: the largest bone fish in the ocean ! 》 Sun Yat-sen University Marine Science
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