If you are fond of biology, you probably know about how to determine the age of some animal and plant species.So, at the age of cattle can be recognized by the horns: every passing year leaves the ring.Similarly, the same way you can learn the age of the tree.Looking at the number of annual rings on his saw cut can be up to a couple of years to find out how many years ago it has grown.But how do you know the age of the fish?Particularly interesting is the case fishermen who occasionally catch spectacular specimens.
Well, it's not so difficult.But first you need to brush up on some biological aspects related to these inhabitants of fresh and marine waters.Their body is covered with scales, the fish that protects against mechanical damage and parasites, as well as serves as a "cowling" which improves the hydrodynamic characteristics of fish, allowing it to move in the water at a higher speed.So, the scales - a kind of analogue cut down a tree.Ask a question about how to find out the age of the fish, it is necessary to tear off one flake and look at it carefully.
The fact that the scales formed on the same annual rings, which can be seen in cut down a tree or cow horns.From the width of the ring you can learn about how was the year if enough fish food.The ring is wider, the more favorable the conditions were at the time.However, before you find out the age of the fish, is to know what you need to take a flake.Ideal scales from the middle of the sideline.Prior to the determination of age it needs to be properly dried out and count the rings with a magnifying glass.
But how do you know the age of river fish, the body that does not have scales?Such species include eel and sturgeon.In addition, species such as the ruff, perch or pike, scales are so small that they can be seen only under a microscope, and in this case, it is no wonder a mistake.To solve this problem it is necessary to resort to another method.
Thus, the perch is used to determine the age of the dried gill lid on vertebrae years have considered a ruff or burbot.At the noble white fish can learn the age of Spila rays anterior vertebrae, and they were also pre-must be properly dried.But how do you know the age of the fish in such a case?It's simple: the above-mentioned parts of the body after drying is necessary to saw, the saw cut to be clearly visible all of the same tree rings, and for which you need to focus, determining the age of fish.
Do not take it if we have described methods are good only for freshwater fish.They are well suited for marine life, which usually do not have scales, or it is too small.Those who are thinking about how to tell the age of marine fish, it should be remembered that its calculation of the annual rings can take a long time.So, a few years ago near Alaska was caught grouper, whose age was estimated by biologists as much in 200 years!
However, according to some researchers, more recently, in our rivers you can catch catfish even more venerable age.But some scientists believe that a number of deep-sea fish living virtually forever, dying just steps from the elements or predators.
