Deep-sea creatures generally look more abstract, and it is estimated that they all think like this: no one looks at it anyway, just grow up.
Their colors are relatively simple, generally white or transparent, because colors also need energy to generate.
Some have evolved the function of light emitting out of the need for predation and communication.
And some creatures combine luminescence and abstraction perfectly, and that's what we're going to cover today: the trout.
Slipped away
Trout (pronounced ān kāng) (scientific name: Lophiiformes) belongs to the genus Bony fish, Troutidae, family Troutidae. It is mainly found in tropical and subtropical deep seas, and is distributed in all oceans.
The common name of the trout is old man fish, toad fish, anglerfish, goose fish. The first three names mainly refer to its appearance and appearance.
I just looked more anxious
It is a benthic fish with a large, flattened disc-shaped anterior part of its body and a cylindrical back end, resembling the shape of a musical instrument lute.
pipa
Because it does not need to swim quickly, the dorsal fin of the trout degenerates, and the front end of the first dorsal fin is specialized into the shape of a fishing rod and bait, usually gently waved at the mouth, luring gluttonous prey to its mouth.
Come on, come on
At this point, the large mouth of the trout can be put into play, and its mouth is full of inward teeth, making it impossible for them to escape once they swallow their prey. And the trout has no neck, no ribs, and a bouncy stomach attached to the back of the mouth. So even if the prey is bigger than it, the trout can not be eaten.
Not all the bait on the head of the trout glows, but in the deep sea, the luminous bait is definitely better because many fish have phototropism. The reason why the bait emits light is because it has glandular cells in the bait, which are able to secrete photosnthein. Photons are catalyzed by photonases and combine with oxygen in water to slowly oxidize and emit light. ，
Since they don't need to swim fast, they also don't have scales, and when they need to move, they use their powerful pectoral fins to crawl on the seabed.
The trout is very gluttonous, and if there is no suitable prey nearby, it will actively move to food-rich waters, and in extreme cases, they may even jump out of the sea to devour seabirds.
The trout generally lives alone, with a lifespan of about five years, and the ocean is so large that the probability of male and female fish encountering it is very low.
Taking the common yellow sturgeon in China as an example, the adult female has an average length of more than 400 mm and a weight of about 2000 grams, while the average length and weight of the male fish is only 1/50 of that of the female.
So the survival strategy of the male fish is to desperately go to find a girlfriend, and when he finds it, he will never be separated again.
Lucky ones who meet their girlfriends will bite the female's skin and then secrete an enzyme to fuse themselves with their partner. From then on, all the nutrients were provided by the woman, and all the male had to do was provide sperm during reproduction.
This strange habit has plagued biologists for a long time, because the caught trout are all females, and all the females have several lumps on their bodies.
Now we know that these lumps are the fused male trout.
So what about the males who don't touch the females? Some died alone, while some determined and tenacious individuals gritted their teeth and became girls.
Therefore, the phenomenon of women's clothing gangsters is actually very common in the animal kingdom.
Cough cough... Then again, the trout also has a name called goosefish, which characteristics of it is mentioned?
The flesh of the trout is tender, rich in gum and rich in nutrients, whether it is hot pot, steaming, braised or sashimi, it is very delicious. Coupled with the fact that the name is pronounced the same as "Ankang", it has always been a traditional food in East Asia. Japan even juxtaposes it with pufferfish, with the saying "Kansai pufferfish and Kanto trout".
The whole body of the trout is a treasure, and the liver, skin, belly (stomach bag), gills, fish meat, fins and ovaries can be eaten.
But the best thing to eat is its liver, due to the habits of the trout, the liver as an organ that stores nutrients, has a high fat content and a huge weight, which can reach 1/4 of the body weight of the trout. Moreover, the trout can only survive in the deep sea, which is difficult to cultivate artificially, so the liver of the trout is not artificially fattened like foie gras. The nutritional value of trout liver is extremely high, rich in unsaturated fatty acids, and DHA and EPA are 4 to 5 times higher than tuna.
Since it is a cod liver, the cooking technique is very important, and if it is not done well, it will be fishy, but if it is done well, it is more delicious than foie gras.
brief summary
The trout is a magical fish, and its habits and shapes are very interesting. Its internal organs and organs have high medicinal value in addition to consumption. So we have to make rational use of them and protect them.
Thank you for watching.
"Growth Characteristics and Rational Utilization of Resources of Yellow Trout in Dalian Waters"
Analysis and Evaluation of Nutritional Composition of Liver of Trout
Spatial-temporal differences in the body weight relationship of yellow trout based on linear mixed-effect model