The age of people is determined by the number of the lived years or on a mark in the passport and the birth certificate. It is documented, also as well as age of pets. The age of trees is determined by quantity of rings on a trunk saw cut. How many rings, are so much also years. How to determine the age of fishes?!
Instruction
1. This way is similar to determination of age of a tree. Here it is only not necessary to saw fish, it is necessary to catch her. Take the hooked fish and pull out at her several (10-15) scales under the basis of the first back fin above a sideline. Try that scales were the correct form, free of defects.
2. Purify scales from dirt and slime. At sufficient pollution put scales in weak solution of liquid ammonia, then dry up them.
3. Consider by means of magnifying glass, a magnifying glass or a microscope of a scale. They, as well as a tree saw cut, have rings. It is considered that the quantity of rings indicates age of fish.
4. At fishes with small scales the age is determined on branchiate covers, ear stones, vertebras, saw cuts of beams of chest fins. Bone material before survey is dried up, degreased, clarified, sometimes boiled down. On it annual rings are also well visible.
5. It is necessary to consider that such way can give only approximate definition of age of fish. Because except annual rings there is both a malkovy ring, and the additional rings arising on scales depending on change of living conditions of fish. To be necessary for you time and observation to learn to learn age of fishes.
6. You have to know age of aquarian fishes if you breed them. But if to you to have to buy small fishes in shop, it is necessary to consider that sellers can seldom tell exact "fish" age. Usually it is sold aged from 6 months till 1 year. Besides, the size of a small fish cannot be an indicator of her years. If the small fish was in bad conditions, ate a little, she can be small and have pale coloring.
7. In general aging of aquarian fishes happens gradually, and attentive aquarians usually know its signs. The small fish begins to turn pale, evenly to fade. The behavior of old fishes also becomes other. They lie at the bottom motionless more often, become apathetic, lose appetite. However these signs have to be shown gradually. Otherwise these signs will mean that the small fish got sick.