Is shad a marine fish or a freshwater fish?

Shad is produced in the lower reaches of the Yangtze River in China. Hengjiang shad tastes best in the area from Dangtu to quarrying. It is known as a treasure in the south of the Yangtze River and a tribute in ancient times, so is the shad a sea fish or a freshwater fish?

Whether the shad is a marine fish or a freshwater fish

Shad is a marine fish, it is a filter-feeding fish, mainly plankton as the staple food, sometimes also eat diatoms and other organic debris, but rarely eat during reproductive migration.

II. Artificial breeding

1. Fish fry cultivation

Because the artificially hatched fish fry are weak and prone to casualties, the whole larval period is carried out in a hatching loop similar to the natural environment, the water quality is the same as the hatching water, and the salt mass fraction of 0.1% to 0.2% is maintained to prevent death caused by rotifer infection.

In the early stage, the plankton net made of 50 mesh sieve silk should be used to catch plankton at a fixed time and feed three times a day, and in the later stage, the window screen with 1mm hole distance should be used to filter the bait, which is about 1.5 times of the body weight of fish fry.

two。 Pond stocking technique

One week before stocking, the pond should be cleaned and disinfected, 7500kg/h fertilizer should be applied, and an aerator should be set up. After stocking, 22.5kg/h soybean milk was sprinkled every day to make the water quality light green or light brown, so as to ensure that the shad had sufficient plankton bait. Try to keep the pond water fat and alive, and the amount of dissolved oxygen must be greater than 3mg/L.

In addition, because the shad moves slowly at 15 ℃, about 13 ℃ will die, so when the water temperature approaches 15 degrees Celsius after autumn, the shad should be moved indoors for the winter. The indoor water temperature is controlled above 20 ℃ and the bait is given once a day.

Shad is a rare and valuable economic fish in China. It is as famous as puffer fish and swordfish. It is known as the "three delicacies of the Yangtze River". Following the Chinese alligator, the Chinese Sturgeon, the beluga dolphin and the carmine, the Yangtze River shad also suffered a population crisis.