In this article we will consider what kind of fish happens. It should be clarified immediately that the word "fish" in the meaning of "dish" will not be discussed here. Only a living fish, that is, a creature living in an aquatic environment, is of interest to us in this case. This is a superclass of aquatic vertebrates, the bulk of which is dominated by gill breathing and there is no feeding of offspring with milk by special glands.
Habitat division of fish
These creatures in this vein should be considered according to the main criterion - whether they belong to freshwater, brackish-water or they need salt water for life. As you can see, the question of what kind of fish can be answered in a detailed manner. In the first case, this is the one that lives exclusively in salty - sea or ocean water. There are also breeds that survive well in both fresh and salty environments. This happens because a brackish liquid is considered optimal for them, that is, one in which the ratio of fresh water to salt is in a ratio of about 1000: 1.
The inhabitants of the seas and oceans
If the reader is interested in what kind of fish happens in the seas and oceans, then this answer is far from a complete list:
- Tiger shark;
- flounder;
- herring;
- salmon;
- sea pike perch;
- halibut;
- sea dog;
- tuna;
- butterfly fish;
- sea Horse;
- sea needles;
- lionfish;
- molva - pike;
- moray eel;
- electric eel;
- marine small-smelt;
- swordfish;
- hedgehog fish;
- monkfish, or European angler;
- triggerfish;
- sea bass;
- capelin;
- sprat;
- saury;
- hake;
- sea bream;
- sailboat;
- flying fish ;
- catfish;
- clown fish;
- cyan snapper;
- notation;
- Golden Spar, or Redfin;
- noodle fish;
- Manta, or the giant sea devil.
Already by the names it can be determined that how different are ocean and marine fish. Photos of some species will only confirm this fact.
Freshwater fish habitat
When asked about what kind of fish happens, they answered you: “Freshwater”? And what is fresh water?
It should immediately be answered that the aquatic environment, which is practically free of salts, can be called fresh. Usually it is considered running water, that is, a river. But many lakes fall into this category. It is no secret that part of freshwater fish for commercial purposes is artificially bred in ponds and irrigation ditches created by human hands. By the way, looking at photos of river fish living in natural conditions, and comparing them with pictures of those born and raised in man-made ponds, it is almost impossible to notice the difference.
And, which is quite interesting, even swamps can serve as a habitat for some species of freshwater fish.
The inhabitants of the rivers
Many of the superclass of aquatic vertebrates that do not feed offspring with milk (belong to freshwater) live in rivers. The list of them is also quite large. In Russia, the most common are the following:
- zander;
- perch;
- bersh;
- ruff;
- pike;
- bream;
- roach;
- chop;
- white eye;
- carp;
- chub;
- crucian carp;
- hustler;
- carp;
- tench;
- asp;
- rudd;
- Chekhon;
- Podust;
- Rapid
- bleak;
- ide;
- gudgeon;
- silver carp;
- grass carp ;
- catfish;
- acne;
- snakeheads;
- loach;
- burbot;
- char;
- salmon;
- sterlet;
- trout;
- grayling;
- umber;
- carp and others.
Photos of river fish are incredibly beautiful. Anglers often take pictures of their trophies, are extremely proud of them. Unfortunately, river living fish in natural habitats is not well represented in the photographs.
Who lives in the swamps?
Crucian is interesting in this regard. Although he may well live comfortably in rivers and lakes, nevertheless ichthyologists believe that it is extremely difficult to meet him in pure mountain water bodies. But in the low-lying swampy lakes and directly in the swamps, he feels just fine.
Many anglers argue that often on a hook in overgrown muddy ponds they come across carp, carps, gobies, tench and eels. Catfish, too, although occasionally, is found here.
Separation of fish species by diet
All river and sea fish, as well as aquarium decorative ones, are classified based on the way in which they feed. Some of these animals should be attributed to predators, since their main diet is smaller fish, often even fry of the same species. Many predators do not disdain shellfish, caviar, carrion.
To date, tragic cases of attacks on humans of the largest bloodthirsty fish - sharks are known. There are legends among the people about how dangerous catfish and big pikes are for people. Allegedly, some large individuals of these species can drag a child or slender woman deep into the reservoir, where they deal with their victims. Or, they say, they mercilessly bite off the limbs of the unfortunate while swimming. However, there were no reliable facts of this.
But the sea "sisters" of river pikes - barracudas - are capable of terrible crimes. They are also merciless moray eels, about which they say that in ancient times among the Greeks they were widespread aquarium fish, which their owners used as a tool for executing objectionable and guilty of something.
The stories about piranhas, chimeras, tiger fish and giant goopers freeze my heart - these are also sea fish. Photos of the above killer fish look pretty intimidating. Nevertheless, it is worth noting that most predators among fish pose a danger only to smaller inhabitants of water bodies. These include burbot, catfish, trout, pike, eel, whitefish, asp, bersh, perch, pike perch, grayling, which live in large numbers in Russian rivers.
Peaceful are bull-calves, loaches, dace trees, carps, tench, roach, fisherman, bluecock, barbel, ide, spikes, bleak, carp, rotan, gudgeon, bream, crucian carp, hustler, upper, white-eye, grass carp, chub, ruff, rudd, peled, vendace and some other freshwater fish.
Differences in breeding method
Most living creatures of this superclass of vertebrates are spawning. Moreover, there is a division, because some species use external fertilization. This happens in cases where a female throws unfertilized eggs into the water, and males belonging to the same species of fish release white liquid with sperm into the fertile environment - milk.
There are fish related to ovoviviparous. That is, fertilization occurs inside the body of the female. It turns out that an already formed fry appears in the light. These may include some stingrays, sharks, bracken, gerbils, sea bass, cyprinids and some others.
Some aquarium fish are also viviparous, photos of which are presented in the article. This, for example, guppies and swordsmen.
Propagation of salmon and sturgeon
Salmon and sturgeon (the so-called red fish) are classified as spawners. A photo of a male salmon before spawning clearly demonstrates how much its appearance changes before this important period in life. A peculiar hump appearing on the back gave the name to one of the salmon species - pink salmon. The jaws of the fish bend hook-shaped, their body acquires a bright, even causing color.
Interestingly, most species of red fish (sockeye salmon, pink salmon, chum salmon and others) are brackish. They are born in fresh rivers, then swimming in the marine environment. To spawn, males and females move against the current back to the places of their appearance. A very large number of salmon representatives die during this period, and did not reach their goal: some because of natural factors, and others because of poaching. After spawning, almost all individuals of both sexes die. Although ichthyologists found several exceptions to this rule, that is, it was possible to register several females that came to spawn five or even seven times.
Sturgeons are also endangered . The names of some species of this valuable commercial breed are known to almost everyone. These are stellate sturgeon, sturgeon, spike, beluga, sterlet and some others.
Aquarium fish
Photos of these vertebrates attract the attention of even those people who are absolutely indifferent to ichthyology and do not feel the desire to have such peculiar pets. The brightness of the color, the unusualness of their appearance play a major role in this.
However, for those who are interested in the underwater world and its inhabitants, aquarium fish can be a real practical tool. Observing them, studying their habits, one can identify all the main gradations of this natural superclass of vertebrates.
Like all fish, these pets contained in aquariums are divided into freshwater, brackish and marine.
There are also notorious predators attacking other inhabitants not at all from hunger, but because such is their natural essence. Such examples are piranhas and decorative sharks. Along with them there are insectivorous fish, as well as those that prefer worms, bloodworms, algae, etc.
Aquarium fish are divided into spawning and viviparous. Most, of course, relate to those who throw caviar and milk into the water.
Briefly about the main thing ...
Watching the life of fish, a person makes important conclusions for himself: in nature, everything is interconnected, everything is dependent on one another. And man is one of the links in the chain for whose integrity he is responsible.