Mention "chainsaw" and "shark", these two words have always been able to evoke the two most feared series of movies in the depths of my soul, "Chainsaw Horror" and "Jaws", relying on the various pictures and plots that directly hit the bottom line of the ability to bear, so that I am really "unforgettable", although I don't know whether these two series of movies have "satisfied" the appetite of the little friends, but even if there is not, don't worry, in the sea in our real life, there is a fish that combines the core elements of "Chainsaw Horror" and "Jaws", That is the saw shark with a "chainsaw" on its head.
<h1 class="pgc-h-arrow-right" > sawshark, not a single shark, but a collective term for sharks of the order sawshark</h1>
The biggest difference between sawsharks and other sharks is that other sharks directly tear the prey by the blood basin when hunting, the whole process is overbearing and fierce, the saw shark's kiss protrudes into a long board, the sides have sharp teeth, the treatment of the prey is very fierce, a sprint directly saws the prey, a few rounds down, the sawn into pieces of the prey remains will be sucked into the mouth, but do not expect the sawshark to hunt whales and other large marine animals, because most of the sawsharks are fierce and gentle on the inside, and the larger the body, the more timid, it is really difficult to understand.
The smallest member of the sawshark is the African pygmy sawshark, don't look at their small size, but the attack power can not be underestimated, it can be said that it is the strongest of the lightweight players, although the sawshark is a little larger individual is only about one meter, but the role of the weapon in front of the head is maximized, their hunting method is very simple, with their extremely fast sprint speed, shuttle in the fish, with their sharp saw kiss back and forth to slaughter the prey, just because the size is too small, restricting their hunting ability, Limited to some smaller fish, in China can see the Same size as the African pygmy sawshark Japanese sawshark, as early as the Qing Dynasty painter Zhao Zhiqian's "Different Fish Map", we can see the sawshark seen by the ancients at that time.
Since there is the smallest, there will be the largest sawshark, the largest known sawshark is the long-snout sawshark, from the long-snout sawshark we can see the domineering appearance of the shark, the adult long-snout sawshark can reach about 4 meters, its "chainsaw" kiss is larger and longer and more deterrent, if you think it is also a corner of the local sea overlord, it is really surprising to you, the long-snout sawshark with a powerful weapon, it is very timid, during the day and other sharks such competitors "hide cat cat", Only come out at night to hunt, the so-called "hunting" here is not the imaginary intense scene, but simply prey on some small fish, or simply insert the kiss into the sand to turn over some crustaceans or invertebrates, completely have a sense of hilarity with a gun as a crutch, really wasted the talent of this body, which made the African pygmy sawshark next door shed "tears" of envy and hatred.
But this may be the survival strategy, the sawshark is too weak, the small size of the fierce can not turn the waves, the medium size of the shortnose sawshark, bahama sawshark, tropical sawshark and six-gill sawshark is too moderate, and similar to their evolutionary spinosaur shark, the maximum length of 15 meters but forever left in the ocean about 200 million to 300 million years ago, success or failure is determined.
<h1 class="pgc-h-arrow-right" > talk about saw sharks, I have to say about the silly sawfish that are not clear</h1>
Sawfish is also a general term for several shark-like rays in the sawfish family, although the sawfish is a cartilaginous fish, the monomeric body can be more than the sawshark eyebrows, sawfish body length of about 5.2-7.6 meters, the maximum length of up to 9 meters, weight of more than 500 kg, their "chainsaw" up to 2 meters, width of 30 cm, such an exaggerated body size and sawn kiss, has made the sawshark ashamed of itself.
Distinguishing between sawsharks and sawfish is very simple, looking at the adult size is the most direct, if you can't tell the difference, sawsharks have two tentacles on the sawn snout and sawfish do not, followed by sawshark gills and other sharks are in the same position, distributed on both sides of the body, and sawfish's gills, like other gills, distributed in the lower part of the body.
Sawfish are generally ferocious, belong to the warm bottom of the fish, usually bored with their own long saw digging soil sand to absorb some crustaceans and invertebrates to fight tooth sacrifice, once they meet the fish will be exposed like sharks like ferocious bloodthirsty nature, mention the "chainsaw" will rush into the fish school left and right collision, for those unlucky fish who can not dodge, waiting for their only body broken, meet the big fish sawfish will not flinch, but in the real sense of the saw back and forth saw the body of the big fish, Until the big fish has no strength to fight back or is killed under the saw before eating.
Sawfish mating period in the autumn of each year, every other year to reproduce once, the mode of reproduction for egg birth, that is, sawfish eggs hatched in the mother's body into juvenile fish and then produced, the general pregnancy period is about 5 months, although the sawfish is every other year to breed, but once can give birth to 15-20 juvenile fish, and the life expectancy is generally around 25-30, the fertility is also on the passing line, more interesting is that when the juvenile fish in the mother's body, their small saws are covered by condoms, and will fall off on their own after giving birth, more amazingly, Scientists have found that wild ctenophores can reproduce asexually, the first vertebrate to be found in nature to do so.
< h1 class="pgc-h-arrow-right" > concluding remarks</h1>
Seeing these strange animals in the sea, I can't help but wonder if the German Andreas Steele had referenced the image of the sawshark sawfish when he invented the chainsaw in 1926, but to be honest, it was so similar that it felt that the chainsaw was also a bionic product.
Unfortunately, the animals mentioned in the article are on the First Class Protection List of the Convention on International Trade in Endangered Species of Wild Fauna and Flora, sawsharks are better, and as for sawfish, the best Queensland sawfish and sharp-toothed sawfish are endangered, and other sawfish are in critical danger.
Reference: Baidu Encyclopedia