The reproduction and growth of eel, is the trout reproduction fast

The ability to reproduce is particularly strong.

The breeding season is from spring to summer. The eggs are laid in mussel shells. During the spawning season, trout often accompany both males and females, looking for a place for river mussels to roost in the water.

Once a mussel is spotted, the female extends out of her spawning tube, inserts it into the mussel's water inlet and lays her eggs in the mussel's mantle cavity. The fertilized eggs of trout grow and develop carefree inside the mussel shell until they hatch into juveniles after 1 month.

Introduction to trout.

Trout is the common name of the fish belonging to the subfamily of the Cypriniformes, also known as the square skin, mirror fish, color round, is a group of small freshwater fish, divided into the genus Trout, the genus Croyd, and the genus Tanaka Trout. The body is oval or diamond-shaped, with a short head and a small mouth. 1 pair or none required.

The anal fin begins below the base of the dorsal fin, the dorsal and anal fins are quite long, with or without stiff spines, the pelvic fin is ventral, the caudal fin is forked, and the lateral line scales are complete or incomplete.

During the reproductive period, females develop oviducts, and males produce marital colors or succules. Trout are omnivorous fish that inhabit slow-moving or still waters, rely on freshwater mussels, reproduce, have a small range of activity, and have a short lifespan. It is widely distributed in East Asia, Southeast Asia and Europe.

Trout have high ornamental value and medicinal value, so they are favored by many fish breeding enthusiasts and medical scientists.

A population of freshwater fishable. Cyprinidae, subfamily Troutidae. There are 5 genera and 12 species in China.

There are two kinds of trout in the genus Trout, the Chinese trout and the round trout. The number is large and the distribution is wide. Most species can be fished.

It is divided into two types, with and without beard, and is mainly produced in the coastal areas of East China, Guangdong, Guangxi, Hainan and Taiwan, as well as Japan and South Korea.

Dace can grow up to a maximum of more than 4 kg.

Dace is spindle-shaped and flattened laterally. The head is short, the snout is round and blunt, and the whiskers are 2 pairs. dorsal fin without hard spines; pectoral fin tip short; Tail fin broad, forked.

Above the pectoral fins there are dark blue diamond-shaped spots with flashes. Dace is an omnivorous fish, which feeds on pond zooplankton, organic detritus, bait feces, etc., and plays a role in "scavenging" and increasing production and efficiency in aquaculture.

It lives in the middle and bottom of rivers and feeds on raw algae. It is not cold-tolerant, and the water temperature is below 7, that is, it dies. The reproductive season is from April to September, and it is concentrated in the middle and upper reaches of rivers to lay eggs. It is common to weigh around 4kg, with a maximum of 4kg or more.

Dace is a medium-sized fish, the largest individual in the natural water body can reach more than 8 catties (10 years old), 1-2 catties of individuals are more common. Under normal circumstances, 1-year-old fish can reach about 1 catty, 2-year-old fish can reach 1 catty, 3-year-old fish can reach about 2 catty, and 4-year-old fish can reach more than 2 catties.

Dace can grow up to 25cm in length.

Improved varieties will be larger.

1.The general body length is 15-25 cm.

2.Dace grows slower than other domestic fish, especially in pond culture, which grows more slowly, weighing about 70 grams for 1-year-old fish, about 250 grams for 2-year-old fish, about 350 grams for 3-year-old fish and about 500 grams for 4-year-old fish.

The growth of fish includes an increase in one and two aspects of body length, and today I will talk to you about the characteristics of fish growth, so as to provide you with a certain theoretical basis for judging in the process of feeding.

Method steps.

The growth of fish is mainly phased, seasonal, and grouped. The following brings you a detailed introduction.

The stage performance is as follows: fish have different growth rates in different periods, in general, the growth rate before sexual maturity is very fast, and the growth rate slows down significantly after sexual maturity, but the change is not big for a long time, and finally the growth rate decreases significantly and squeaks and dies.

Therefore, when we carry out breeding, we should select the stage with the fastest growth rate for breeding, save costs and improve economic benefits.

Seasonality: Fish are very affected by their environment. Among its influencing factors, water temperature and bait are the most influential.

Therefore, according to this characteristic, fish farming is generally carried out on a one-year cycle.

Population: Fish have the characteristics of judging clusters, and the experimental results show that polyculture of multiple fish is significantly due to the rearing of monospecies.

Therefore, according to these characteristics of fish growth, how to raise them in Kimimachi can get the maximum benefit.

The oviposition period is from May to June, when both males and females have pearl stars on their bodies. bream generally reach sexual maturity at 2-3 years of age, and the minimum age of sexual maturity is 2 years old. Generally sexually mature females weigh 450 grams; The male weighs 400 grams.

The spawning period is from May to June, and most of the eggs are laid at night. The optimal water temperature for spawning is 20-29, and the water flow requirements are not strict. The eggs are slightly sticky, yellowish, and adhere to aquatic weeds or other objects, so their spawning grounds are mostly in shallow water and grassy places.