CATDOLL : CATDOLL: Breeding of Killifish

1. Reproduction of Killifish

The medaka fish has a strong reproductive capacity and can reproduce almost all year round. Each time, it lays about 10 to 20 eggs. The number of eggs laid depends on the size of the female fish. In waters with sufficient food, it lays eggs every 2 to 3 days. The hatching time of the fry is about 8 to 14 days, and the speed is related to the water temperature. The eggs are soft and sticky, and are fertilized in vitro. The diameter of the eggs is about 0.1 cm when they are born. The hatched fry is about 0.3 cm. It can reach 0.5 cm in a week, 1 cm in a month, and mature to 3 cm in about half a year. The maximum is about 4 cm, and the lifespan is about 3 to 4 years.

When the male fish is in heat, its pelvic fins turn black and there is a distinct black line between its eyes on the top of its head. It will occupy territory and will immediately approach unbearable female fish or other male fish, and will immediately approach pregnant female fish to mate. If there is a suitable environment, the medaka fish can reproduce very easily, but the fertilized eggs should be quickly moved to a safe environment, otherwise they will be eaten by adult fish. The medaka fish is an endangered fish, and there is almost no good habitat for this fish. The main reason is that foreign fish species, pesticides and improper soil and water conservation have destroyed the living space of the medaka fish.

2. Will dace reproduce in fish ponds?

No, the water is cold.

3. Growth and reproduction of yellow sandflies

Crickets lay eggs underground after mating. When the plant stalks in the cage die, a large number of hatched larvae emerge from the ground.

4. Can minnows reproduce without clams?

Yes. The reproduction speed of river clams is 0.25 times faster than that of

5. Mynah breeding

Mynah birds can also be artificially bred. Choose a pair of mynah birds and place them in a larger cage to foster affection. Hang a breeding box 150 cm long, 100 cm wide, and 140 cm high above the cage. Provide them with straw and twigs to make nests. Mynah birds lay 2 to 4 eggs per nest, usually one per day, but sometimes one every other day or every few days. Once all the eggs are laid, they can start hatching.

The breeding season of wild mynah birds is from February to May, and they can breed 1 to 2 times a year. They start to build nests in tree holes in early spring, and pad the holes with weeds, twigs, feathers, etc. Each nest lays 3 to 4 eggs, which are oval in shape and have bright blue-green shells with lavender and reddish-brown spots. The female bird is mainly responsible for incubating the eggs, while the male bird is on guard. The incubation period is 15 to 18 days.

After experiments, the Tianjin and Beijing Zoos and other units successfully bred mynah birds artificially in 1980. Artificial breeding requires attention to the selection of parent birds, which should not only be healthy, but also have beautiful feathers and pleasant voices. Male birds are active and lively when they are in estrus, and their voices are higher and more frequent than usual; while female birds droop their wings and shake when they are in estrus, making noises, and then chasing male birds with their voices. When they are in love, they mate at the bottom of the box. At this time, a breeding box of 15 cm x 10 cm x 14 cm should be hung above the cage, and nesting materials such as straw and twigs should be provided. Mynah birds lay 2 to 4 eggs per nest under artificial conditions, usually one per day, but also one every other day or several days. The eggs will not hatch until they are all in the nest. During this period, both male and female birds are relatively quiet and their activity level is reduced. In addition to eating and excreting, female birds incubate eggs day and night. Male birds have obvious nest protection phenomena. If someone approaches, they will peck with their beak. The chicks will hatch in 15 to 18 days. After the chicks hatch, both male and female parents participate in raising the chicks, but the female takes the lead in the early stage, and the male takes the lead after half a month. The chicks are fed mainly mealworms and other insects, with calcium supplemented in moderation. The chicks can leave the nest and return to the nest at 26 days old, and can live independently after 30 days old.