Breeding neon tetras requires strict control over water quality, water temperature, lighting, and the breeding process. The specific operations are as follows:
I. Preparation of Breeding Conditions
Water Quality Requirements
pH Level: 5.6-6.8 (slightly acidic soft water). Sodium dihydrogen phosphate can be used to adjust the pH.
Hardness: dGH 2.0-4.0N (extremely soft water). Distilled water or softened water is recommended.
Dissolved Oxygen: Maintain sufficient levels by aerating the water with an air pump for 2-3 days.
Water Temperature Control
The water temperature during the breeding period must be stably maintained at 25-26°C, with temperature fluctuations not exceeding 1°C.
A heater can be used to keep the temperature stable, and a thermometer should be used for real-time monitoring.
Breeding Environment
Breeding Tank: A tank with dimensions of 600×200×200 mm is recommended. A nylon mesh plate or palm fiber should be laid at the bottom of the tank as a substrate for egg attachment.
Lighting: The breeding tank should be placed in an area without direct strong light. The tank can be covered with paper to create a dim environment (only a small amount of light is retained).
Quiet Environment: Avoid frequent disturbances to reduce stress in the fish.
II. Selection and Pairing of Breeding Fish
Standards for Breeding Fish
Age: 6-8 months old (sexual maturity stage), with a body length of approximately 5 cm.
Gender Differentiation:
Female Fish: Wider body frame and swollen abdomen.
Male Fish: Slenderer body frame and more vibrant colors.
Health Status: Select breeding fish with strong activity and bright body colors.
Pairing Method
Ratio: Pair fish at a 1:1 (male to female) ratio.
Timing: Place the breeding fish into the breeding tank at dusk; spawning will occur the next morning.
Fecundity: Each pair of breeding fish can lay 120-200 eggs.
III. Breeding Operation Process
Preparation Before Spawning
Separate the breeding fish into different tanks 1-2 days in advance and feed them sufficient high-protein food such as water fleas.
Place cabomba grass or palm fiber in the breeding tank and aerate the water for later use.
Spawning Process
After the breeding fish are placed in the tank, the male fish will chase the female fish vigorously.
The female fish will lay eggs on the attachment substrate, and the male fish will release sperm at the same time to complete fertilization.
Note: Stop feeding during the spawning period to prevent water quality deterioration.
Post-Spawning Handling
Immediately remove the breeding fish from the tank after spawning (to prevent them from eating the eggs).
Maintain a stable environment in the breeding tank and avoid direct light exposure.
IV. Incubation and Fry Care
Incubation Conditions
Water Temperature: 25°C (constant).
Lighting: Keep the environment dim; avoid strong light to prevent fry deformities.
Dissolved Oxygen: Continuously aerate the water to ensure sufficient oxygen supply.
Incubation Time
Fertilized eggs will hatch into larvae in approximately 24-36 hours.
The larvae will be able to swim and feed after 3 days.
Fry Rearing
Initial Feed: Feed "infusoria" (rich in paramecia) or egg yolk water, and add a small amount of salt for disinfection.
Water Change: Replace 1/3 of the water weekly to keep the water clean.
Growth Cycle: The fry will reach sexual maturity in approximately 5 months and can breed multiple times a year.
V. Breeding Difficulties and Precautions
High Water Quality Requirements
Extremely soft water must be used, and the pH level and hardness need to be adjusted accurately.
Avoid using new tap water; old water or water that has been left to stand for a long time is recommended.
Lighting Control
The breeding tank needs to be shaded during the breeding period to prevent strong light from inhibiting spawning or causing fry deformities.
Care for Breeding Fish
Remove the breeding fish from the tank promptly after spawning to prevent them from eating the eggs.
Feed the breeding fish sufficient high-protein food before breeding to enhance their physical condition.
Disease Prevention
Regularly disinfect the breeding tank to prevent infections such as water mold.
Closely observe the fry during the fry stage and isolate sick fish in a timely manner.