CATDOLL : CATDOLL:What types of angelfish are there?

1. What types of angelfish are there?

Types of angelfish: After generations of artificial screening, hybridization and targeted breeding, angelfish now have many different colors and body shapes in addition to the black angelfish, such as: gray angelfish, marble angelfish, long-fin or short-fin angelfish, black and white angelfish, zebra angelfish, diamond angelfish, golden-headed angelfish, panda angelfish, red-eyed white angelfish and black and gold silk (golden silk black angelfish), etc.

(1) Black Gold Thread: The fins are beautifully shaped, with elongated upper and lower ends of the tail fin. The body is black with irregular crisscrossing golden threads, which are shiny and beautiful, making it look noble and extraordinary.

(2) Black and white angelfish: The body becomes smaller, while the fins become longer and the tail fin is extended. The body color is distinctly black, and the third and fourth black stripes are connected like a wide band, forming a sharp contrast with the first and second black stripes. Its shape and color are handsome and majestic.

(3) Red-eyed White Swallow: Its eyes are bright red like gemstones, and its body is pure white. Its pelvic, anal and caudal fins are extremely long, like long ribbons floating under and behind its body, making it as beautiful as a fairy.

(4) Diamond Swallow: The body shape is similar to that of the angelfish, with slightly shorter pelvic and anal fins that spread out backward like paddles. The whole body sparkles with diamond-like brilliance. Under the light, each scale looks like a diamond, reflecting light.

2. What kind of fish can be raised in an eight-acre pond with eight meters of water?

The main fish are 500 grass carps, 100-200 carps, 60 silver carps, and 30 bighead carps. The grass carps and carps are of the same size, and the silver carps and bighead carps are of the same size. Fish are harvested two to three times a year, with an output of more than 2,000 catties per mu.

3. What animal is it that can turn the tide and enter thousands of homes?

The fish are everywhere and they enter every household.

Fish are the oldest vertebrates. Some hybrids with different numbers of chromosomes are still fertile. They live in almost all aquatic environments on Earth, from freshwater lakes and rivers to saltwater seas and oceans. Fish are cold-blooded vertebrates that live in water all year round, breathe with gills, and use fins to assist body balance and movement. According to statistics from the late Canadian scholars, there are 24,618 species of living fish in the world, accounting for more than half of the named vertebrates, and new species of fish are constantly being discovered, with an average of about 150 species per year. In more than ten years, more than 1,500 species should have been added. At present, there are about 32,100 named fish species in the world. It is the most primitive and lowest group in the subphylum of vertebrates.

Fish meat is rich in animal protein and phosphorus, and is nutritious, delicious, and easily digested and absorbed by the human body. It plays a significant role in the development of human physical and intellectual strength. Other parts of the fish can be made into cod liver oil, fish glue, fish meal, etc. Some fish, such as goldfish and tropical fish, have various shapes and bright colors, and have high ornamental value. my country has a long coastline, numerous rivers and lakes, and a rich variety of fish. According to surveys, there are more than 1,000 species of freshwater fish in my country. The famous "four major carps" (black carp, grass carp, silver carp, bighead carp), carp, crucian carp, etc. are all major fine freshwater fish varieties in my country; there are about 2,000 known marine fish in my country, and the common ones are hairtail, large yellow croaker, salmon, etc.

4. What are the benefits of raising fish and growing grass?

1. Cultivation technology

1. Sowing period and sowing amount: It is best to sow multi-flowered ryegrass from late August to early September, by broadcasting or row sowing, with a seed rate of 1.5-2 kg per mu; alfalfa can be sown in spring, summer and autumn, by broadcasting, with a seed rate of 0.8-1 kg per mu; Sudan grass is sown from late March to early June, with a seed rate of 2-3 kg per mu; hybrid pennisetum is sown in spring, with a seed rate of 0.1-0.2 kg per mu, and it can also be sown by rhizomes.

2. Fertilization and field management The fertilizer requirement of forage grass varies with the variety, and the fertilizer requirement of Gramineae is higher than that of Leguminosae. For medium-fertility soil, 25 to 30 kg of nitrogen fertilizer per mu is suitable for Sudan grass, 20 to 25 kg for ryegrass, and about 25 kg for hybrid Pennisetum. Phosphorus fertilizer is mainly applied to alfalfa, 25 to 40 kg per mu, and molybdenum fertilizer and zinc fertilizer are applied appropriately. Apply about 5 kg of nitrogen fertilizer after each harvest, or a certain amount of human and animal manure. Field management mainly involves loosening the soil and weeding, watering after a long drought, ensuring full seedlings, and maintaining a good field water system at ordinary times.

3. Harvesting period and frequency The harvesting period and frequency directly affect the quality and yield of fresh grass. If harvested too early, the quality is good but the yield is low; if harvested too late, the yield is high but the quality is poor, so it is very important to master the appropriate harvesting period and frequency. Ryegrass can generally be mowed 3 to 4 times, starting in early and mid-April; Sudan grass and hybrid foxtail grass start mowing in late June to early July, and can generally be mowed 4 to 5 times; alfalfa starts to be harvested in early April, and can be mowed 3 times, and mowed once more after summer. In addition, some supplementary varieties can be interplanted, such as nephrolepis, clover, and string grass to ensure that there is fresh grass to feed the fish every day.

4. Area matching Generally, 350-400 square meters of grass are planted per mu of water surface. In spring, ryegrass is the main variety. It is sown at the end of August and the beginning of September. About 200 square meters are planted per mu of water surface, and the yield per mu is about 4,000-5,000 kilograms. Sudan grass and hybrid pennisetum are the main varieties of grass in summer. About 200 square meters are planted per mu of water surface. Sudan grass can be sown in stages. Early sowing in March can provide grass in mid-June; late sowing in early June can produce 8,000-10,000 kilograms of grass per mu. Alfalfa is a perennial forage grass with excellent grass quality. It can be sown in spring and autumn. About 150 square meters are planted per mu of water surface. It starts to provide grass from early April and can be mowed 3 times before the end of June. It can be fed with ryegrass. After summering, it can be mowed again in October-November to provide grass, which just replaces Sudan grass and hybrid pennisetum. For each kind of forage and after each mowing, pay attention to timely tillage and topdressing to promote its regeneration and rapid growth.

2. Reasonable mixed breeding

When growing grass and raising fish, herbivorous fish such as grass carp and bighead carp should be the main species, and they should be mixed with omnivorous fish such as carp and crucian carp. The proportion of silver carp and bighead carp can be appropriately reduced.

Grass carp has a strong feeding ability, grows fast, and has a low mortality rate. Stocking in large quantities is most beneficial to increasing production. Although the bighead carp grows slowly, it has a high economic value and can eat the grass scraps left by the grass carp. Because its feeding ability is not as good as that of the grass carp, it is necessary to win by quantity when stocking. Carp, crucian carp, etc. eat leftover bait and crucian carp, which can reduce the decay and decomposition of organic matter at the bottom of the pond. Therefore, the stocking ratio can be increased with the increase of total production and yield per unit area. The stocking ratio of silver carp and bighead carp is relatively small.

The specific proportion of various fish is: 200-250 grass carps weighing 0.15-0.25 kg per mu of water surface; 180-230 bream weighing about 50 grams; if the size is smaller, the number can be appropriately increased to 250-300 per mu of water surface; 80-100 carps weighing 40-50 grams; 250-300 crucian carps weighing 25-30 grams; 150-180 silver carps weighing 60-80 grams; 60-80 bighead carps weighing 80-100 grams. The best time to release fish is in late February and early March, so that by the end of the year, about 700 kg of fresh fish can be caught per mu. Excluding the weight of the fish, the yield per mu can reach more than 500 kg.

3. Strengthen management

The amount of grass fed daily can be determined according to the weather, water quality, fish appetite, etc. The feeding time should generally be between 8 and 9 in the morning, and the amount of grass fed should be enough for the fish to finish eating by 4 to 5 in the afternoon. If the fish finish eating before this time, the amount of grass fed the next day should be increased as appropriate; if the fish cannot finish eating or the weather is bad, the amount of grass fed the next day can be reduced as appropriate. Leftover grass clippings should be removed in the evening of the same day to prevent them from rotting and affecting the water quality.

For ponds that grow grass and raise fish, topdressing generally uses decomposed organic manure, and only a small amount of chemical fertilizer is applied during the hot season. The method, quantity, and frequency of topdressing should be flexibly controlled according to the season, water temperature, water color, and other conditions. The principles that need to be followed are: apply frequently and less in hot weather, apply less or no on rainy or sultry days; apply less when the water is concentrated, and apply more when the water is light. Organic manure is generally applied once every 10-15 days, and 1-1.5 kg of urea and 1.5-2 kg of phosphate fertilizer can be applied per mu each time. Dissolve the two fertilizers in water and sprinkle them all over the pond.

When planting grass and raising fish, a small amount of water should be added at the beginning of stocking. Water should be added once every 5-7 days, and 10-15 cm of new water should be added each time. The highest water level will reach 2-2.5 meters in mid-June. After that, the water should be changed once every 10 days or so. For ponds with poor water quality, the amount of water changed each time should be about 1/3 of the original amount, so that the water quality remains rich, active, tender and refreshing, with the transparency preferably between 25-30 cm and the pH value of 7-8.