SEXUAL IDENTIFICATION AND REPRODUCTION OF ZIBRAFIO
It is not difficult to distinguish between male and female zebrafish: male zebrafish is slender, the fin is large, the body color is yellow, the anal fin is brown, and the stripes are prominent; the female fish is larger, the body color is light, blue, the gluteal fin is light yellow, and the abdomen of the fish is dilated obviously during the pregnant period.
Zebrafish is an egg-laying fish, 4-month-old into the sexual maturity, generally used 5-month-old fish reproduction is better.
Zebrafish can reproduce more easily. The water for reproduction requires pH6.5-7.5,6-8 hardness and 25-26 degrees Celsius. Zebrafish like to eat their own eggs, so the breeding tank is covered with small stones and aquatic plants to facilitate the attachment of eggs. When breeding, it can be prevented into the breeding tank according to the ratio of 1:2 between male and female, which is generally prevented from entering the night before, and can be spawned and fertilized at noon or in the morning the next day. Fish should be fished out and reared after ovulation. A female fish can ovulate 300-1000 eggs at a time.
The fertilized eggs can hatch the larvae after 2-3 days, and then the larvae begin to swim for food after 2 days. They are fed with "migratory water" at first, and can be changed to other small fish and insects after 10 days.
The reproduction cycle of zebrafish is about 7 days. Zebrafish can reproduce 6-7 times a year continuously, and the number of eggs laid is high.
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Processing technology of frozen raw shrimp
Production method 1. Raw material selection: the requirement for raw shrimp is that the quality is fresh, and the shrimp body has no deterioration and no peculiar smell. two。 Thawing: when using frozen shrimp as raw material to process shrimp, the first step is to defrost. Put the frozen shrimp in the thawed bamboo basket and rinse with water. The amount of water should be large to speed up the thawing speed. When the shrimp body is separated from the frozen pieces, it will stop thawing. The quantity of thawing should be determined according to the ability of meat peeling, neither disjoint nor overstocking to prevent deterioration. 3. Meat peeling: hold the shrimp body with the left hand, tail belly up, gently pick the shrimp head with the right hand, and peel off the shrimp carefully
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A Simple Method for Preparing Several Green Fish Medicines
In the prevention and treatment of fish diseases, if we can use local green plants or traditional Chinese medicine to prepare fish medicine, we can not only prevent and treat common diseases such as red skin disease, enteritis, rotten gill disease, but also save costs. The simple preparation method of several kinds of green fish medicine is introduced as follows:1. Sanhuang powder: rhubarb, phellodendron bark and scutellaria baicalensis are prepared according to the ratio of 5:3:2. When in use, 1 kg of "three yellow powder" and 0.4 kg of salt are added to every 10 kg of fish feed, and a proper amount of water is added to prepare granular bait for feeding. Once a day, continuous feeding for 5 days, in the early stages of treatment
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