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The morphological characteristics of the giant zebrafish are oval and tall. The back is dark yellow-brown, the center of the body is blue-gray, the front has several yellow horizontal stripes that are not continuous, the rear has 2-3 obvious yellow vertical stripes, the abdomen is light color, and each fin membrane is transparent and smooth. color. The maximum length can reach 15 cm. Their habitat ecology belongs to freshwater fish in the tropical surface water layer. They are very adaptable to the environment. They can live in waters with strong currents as well as in drier wetlands and swamps. However, the main groups are found in ponds and streams. middle. It is an omnivorous fish species that mainly feeds on terrestrial insects and substrate debris. The eggs are laid on the roots of shallow water plants that grow quickly after heavy rains. They are bright orange sticky eggs that hatch in about 1-2 days. Within 5 days, the young fish can swim freely. The geographical distribution is mainly distributed in the mountainous streams of West India and Sri Lanka in Asia. Fisheries use commercial survey fish.
1. Common knowledge about raising large zebrafish
1. Shape and customs
The fish is 10 to 12 centimeters long and is the largest among zebrafish. It is spindle-shaped, with a wider body and a smaller, pointed head and snout. The body color is olive green, the back is yellowish brown, and the abdomen is orange yellow. There are blue vertical stripes on the side of the body from the back of the head to the tail. The central stripe extends to the center of the tail fin, and the blue stripes flash yellow or yellow-green. The dorsal fin, pelvic fin, anal fin and tail fin are all orange-red. The large zebrafish likes an environment with clear water and light, and other aspects are not important. Basically, it is the same as the zebrafish with ordinary fish. Because of its large size, it swims quickly, often moves on the water surface, and loves to jump, so it should be kept in a larger (60~70CM) water tank and covered.
2. Growth characteristics and body odor
Female fish are generally stronger and plumper than male fish, with swollen abdomen, but lighter color and unclear patterns; male fish are thin and slim, beautiful in color, with red pelvic fins and obvious patterns. Use weakly acidic soft water with a water temperature of 27 to 28 degrees. The bottom of the water should be paved with gravel or aquatic plants. The water should be shallow and the box mouth should be covered. Female fish lay 200 to 500 sticky eggs, and some can reach 1,000 eggs. Remove the broodstock immediately after spawning. Fertilized eggs can hatch into larvae within three days.
When raising zebrafish, pay attention to maintaining the water quality with nitrite concentration and providing nutritious bait. Of course, other water quality and water temperature requirements cannot be ignored.
(1) Activated carbon filtrationWater: Put activated carbon into a plastic or enamel cylinder, let tap water flow in from the water inlet at the bottom and flow out from the water outlet at the top. The filtered water is stored in aquariums or other containers, and can be used as water for daily breeding and growth of common hot-tempered fish.
( over over the ] Water filtration with ion exchange resin: Use ion exchange resin as filter material, and with the help of the adsorption capacity of anionic and cationic exchange resin, calcium ions, magnesium ions and nitrite in the water can be adsorbed.
(3) Deionized water: also known as distilled water. Electrodialysis and electrolysis are widely used to obtain the water quality, which is very pure. The quality of deionized water is extremely soft and the oxygen content in the water is extremely low, making it unsuitable for feeding. When used, it is often mixed with dry clean water to obtain water quality with different hardness and pH to meet the water needs of different types of growth.
(4) Rainwater: The water quality is soft and contains very little metal ions. Generally, it can be found in places with fresh air in suburban areas. Rain and precipitation can be collected in containers, and then filtered before use.
2. Breeding skills
1. Feeding:
(1) Feeding habits: The water temperature of large zebrafish is generally controlled at 24-28℃ Within this temperature range, the large zebrafish has a strong appetite and grows rapidly. It is not affected by changes in external temperature and is ultimately maintained in a relatively safe state. The food for large zebrafish includes fish worms, water earthworms, fiber worms, mealworms, small live fish, pellet feed, etc. There are many types of zebrafish with different sizes, so the bait selection for different types of zebrafish is also different. For large zebrafish with a body length of 3-12 cm, the main food is turtle worms, supplemented by water earthworms, red worms and yellow mealworms. For large zebrafish with a body length of more than 12 centimeters, turtle worms are generally small and less delicious, so slightly larger baits should be used, mainly including red worms, water earthworms, yellow mealworms, small live fish, etc. Large zebrafish generally feed mainly on animal feed, and small species can also be domesticated to feed mainly on pellet feed. However, there are very few fish that feed mainly on plant feed.
(2) Frequency of feeding: The amount of feeding for large zebrafish should be determined based on the size and number of the fish. When raising golden striped fish at home, they generally only need to feed it 1-2 times a day, and the amount of feed should be eaten within 5-10 minutes. When raising a large number of large zebrafish, bait needs to be fed 2-3 times a day; for breeding fish in the growth period, bait is generally fed 3-4 times a day. Because large zebrafish are small in size and have limited food intake, it is appropriate to feed 7-80% of the food every time. Reducing the number of feedings will encourage the turtles to grow faster. Most species of large zebrafish mainly feed on turtles and insects. When the bait is mainly worms, the amount of bait should be controlled to be eaten within 10-30 minutes. When the feed is mainly water earthworms, the feeding amount should be controlled to be eaten within 5-10 minutes, and each person should feed 2-3 times. The water earthworms should be rinsed and cleaned. When the bait is mainly small fish and shrimp, in principle, it should be fed more often and less frequently. When the yellow lightning zebrafish is replaced with new bait, the amount of bait should be gradually increased from small to small.add. Before transporting golden striped fish, bait should be stopped for 1 to 2 days.
2. Water use:
(1) Adding water: Adding water refers to partial water change. This is a simple and effective method often adopted in raising zebrafish. Before adding water, turn off the heater, air pump, circulation filter pump and other electrical appliances in the aquarium, then use gauze to clean the glass on the walls of the aquarium or the moss on the scenery, and let the water sit for 15 minutes. Finally, all suspended matter in the water sinks to the bottom of the tank, and the bottom dirt is gently sucked out with a rubber tube. - Generally, the amount of water sucked out accounts for about 1/4 to 1/3 of the total water volume. Then slowly inject new water of the same temperature along the cylinder wall.
(2) Water change: Water change refers to the complete change of feeding water. It is the simplest and most effective way to change the water quality, but the workload of changing water is relatively large, especially when the aquarium has little scenery. , the process is complex and cumbersome. Before changing the water, cut off the power supply to all small electrical appliances in the aquarium, take out all the fish and scenery, and put away the water. After the aquarium is cleaned and dry, put all the scenery away and put in new water for later use.
3. Broodstock cultivation
The method of feeding broodstock is to obtain high-quality fertilized eggs. There are two types of feeds for feeding broodstock: active feed and synergistic feed. The synergistic feed should contain more than 40% protein, more than 3.5% crude fat, less than 4% moisture, 0.9% to 1.6% calcium, and 0.8% phosphorus. ~1.4%, and add a certain amount of substances effective in gonad development, such as ve, va, vd, trace element zinc, etc., feed 1 to 2 times a day. During the growing season, feed cladocerans, copepods, annual insects, or small fish, shrimps, etc. that have been blanched and ground in water, 2 to 3 times a week.
When feeding, please note: ① Store tap water for 2 to 3 days in advance. ② Adjust the water pH to 6.5 to 7.5. ③The pH of water is 7~8.
4. Gender Determination
First of all, look at the skin. The one with a silvery gray color is a female, and the one with a lemon color is a male. Secondly, the sexually mature female fish has a plump body shape, a swollen and soft abdomen, and an obvious ovarian surface when looking upward, and is flexible to the touch. The male zebrafish has a flat abdomen and a long body.
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