Barracuda
Barracuda also known as meat stick (Liaoning, Hebei), red-eyed fish (Shandong), red eye shuttle, red-eyed mullet (Zhejiang, Fujian), vegetarian fish (Guangdong).
(i) Morphological characteristics
The nose is short, the front part of the body is subcylindrical, and the rear part is laterally compressed. Small eyes, fat eyes face is not developed, eyes next to a circle of red. The maxilla bends suddenly downward at the corner of the mouth. The origin of the first dorsal fin is closer to the snout than to the caudal base. Caudal fin trailing edge slightly concave. The body is greenish-blue, the abdomen white, and the body side has black longitudinal stripes. Each fin is light gray.
(ii) Habits of life:
1. habits
Barracuda are distributed along the coast of China, but more in the north and less in the south. Sexually active, jumping. It lives in estuaries and harbours and has access to fresh water. Juvenile fish like to swarm and have obvious phototaxis and rheotaxis. Barracuda has a wide range of salinity adaptation, ranging from 0 ‰ to 38‰. It can live in seawater, brackish water and fresh water. It also has a wide range of temperature adaptation. It can live in waters with water temperature of 3~35℃, the optimum water temperature is 12~25℃, and-0.7℃ is lethal.
2. breeding
The breeding season of barracuda varies from the end of April to the beginning of June in Bohai Bay and from the beginning of April to the beginning of May in Zhejiang. The age of sexual maturity is generally 2~3 years for males and 3~4 years for females. The number of eggs is 1.5 - 6 million. Floating eggs, egg diameter 0.9~1 mm, oil globule 1.
- Prev
Rare earth feed for breeding fish and adult fish
In the feed for breeding fish and adult fish, the proportion of rare king can not only improve the utilization rate of feed, but also promote the growth of fish, enhance its disease resistance, play the role of disease prevention and treatment, reduce the death of fish, and improve economic benefits. The blending method of feeding fish is as follows: 40-50 grams of rare earth or 1 packet of rare earth additive, dissolve with a little vinegar or acid water, then 0.5 kg of water, spray evenly on 60 kg concentrate feed with sprayer, spray while mixing, if there is a magazine, it can be made into puffed feed, and the effect is better.
- Next
Feed formula for nine kinds of fish
1. Suitable for grass carp or silver carp rice straw meal 70%, bean cake 15%, cotton cake 10%, corn flour 5%, plus bone meal 1%, salt 0.5%, vitamin amount. two。 It is suitable for raising grass carp and soybean straw, or peanut vine 60%, bean cake 15%, rapeseed cake (or cottonseed cake) 10%, corn flour 10%, fish meal 5%, clam shell meal (or bone meal) 1%, salt 0.5%. 3. Suitable for grass carp thousand green grass powder (or peanut vine, sweet potato vine) 45%, bean cake 15%, rice bran 15%, wheat bran 10%
Related
- On the eggshell is a badge full of pride. British Poultry Egg Market and Consumer observation
- British study: 72% of Britons are willing to buy native eggs raised by insects
- Guidelines for friendly egg production revised the increase of space in chicken sheds can not be forced to change feathers and lay eggs.
- Risk of delay in customs clearance Australia suspends lobster exports to China
- Pig semen-the Vector of virus Transmission (4)
- Pig semen-the Vector of virus Transmission (3)
- Five common causes of difficult control of classical swine fever in clinic and their countermeasures
- Foot-and-mouth disease is the most effective way to prevent it!
- PED is the number one killer of piglets and has to be guarded against in autumn and winter.
- What is "yellow fat pig"? Have you ever heard the pig collector talk about "yellow fat pig"?