Breeding of Caspian sea salmon
Introduction
Many creatures are similar to fish and are called fish, but in some cases this naming is wrong. For example, amphioxus and lamprey are considered as fish, but these animals are very different from the extinct and current fishes of the world. A fish is actually a creature that at least has a jaw and a jaw, has a cartilaginous or bony skeleton, and has even and odd swimming fins.
Fish are a category of mammals that are divided into two subcategories of cartilaginous and bony fish. Some fish live in fresh water and some live in salt water. Freshwater fishes have many orders. One of the orders is the free order of salmon (Salmoni formes), and the free family of fishes, of which salmon is a part, is one of the families of this order.
Characteristics of free-ranging fish
The female fishes of this family do not have an oviduct, and the egg falls into the abdominal cavity after maturation and is then directed out through the genital tract. Therefore, the eggs can be easily removed from the body by pulling the hand under the belly of the mature fish. The fish of this family live in cold waters with plenty of oxygen and spawn in autumn and winter.
Among them, different races have been created according to local conditions, which are different in terms of body shape and way of life, and therefore it is difficult to identify them due to their great diversity. The fish of this family, i.e. salmon and salmon, are economically very valuable and have delicious meat
Specifications
Salmon has a compact body and its caudal fin is larger than that of salmon. Its caudal stem is high, the head is slow, and the outer part of the caudal fin is almost smooth. The number of scales between the fat fin and the lateral line is 14-19 and on average about 16. The number of spines of the first gill arch is between 2-5, which are sword-shaped and button-shaped at the bottom. The maximum body length of salmon is 140 cm and its weight is almost 5 kg
Caspian lake trout
The color of the body of this fish is silver and there are star-shaped spots on the sides. The number of scales between the fat fin and the lateral line is 11-19. The average height is 77 cm and the weight is 5 kg. This fish, which lives in the northern part of Iran, enters the rivers entering the Caspian lake to spawn in late autumn and early winter.
The food of this fish is made up of insect larvae and baby fish at young ages, and various types of fish at older ages. This fish is one of the most valuable fish in this lake. Overfishing, blocking of migration routes due to the construction of bridges, not taking into account the migration route of fish and water pollution are factors that have endangered the generation of fish
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