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At what size do crucian carp spawn, and how many days does it take for the eggs to hatch into fry?
Crucian carp, commonly known as crucian, with local names such as jiguazi, yuejizai and tuji, can produce many new varieties through artificial breeding and selective breeding. So at what size do crucian carp spawn? How many days does it take for the eggs to hatch into fry? According to farmer Mr. Zeng, the gonads of crucian carp mature earlier than those of other fish; fish in their second year can spawn, and they continue to grow in size while spawning. One-year-old crucian carp can already spawn. Moreover, the spawning period is long, lasting from spring all the way to autumn, and the number of eggs laid is large; the eggs are laid on aquatic plants or other objects in shallow water. The strong reproductive capacity of crucian carp is an important reason why it is widely distributed and abundant. There is another point: crucian carp still forage for food during the spawning period, which is different from other fish. <p style="text-align: center;"></p> <p style="text-indent:2em;"><span style="color:#FF0000">How many days does it take for the eggs to hatch into fry?</span></p> <p style="text-indent:2em;">Generally, it takes 3—7 days from the laying and fertilization of the eggs to the hatching of the fry. If the average water temperature is 15—20°C, the hatching time is 5—7 days; if the average water temperature is 20°C, the fry can hatch in 4—5 days; if the average water temperature is 20—25°C, only 2—3 days are needed. In short, the lower the water temperature, the longer the hatching time.</p> <p style="text-align: center;"></p> <p style="text-indent:2em;"><span style="color:#FF0000">Crucian carp farming techniques</span></p> <p style="text-indent:2em;">1. Pond conditions</p> <p style="text-indent:2em;">Crucian carp has the habits of liking to gather in groups, burrowing into mud, and leaping upstream to escape. The pond area for mainly farming crucian carp should not be too large; generally about 2 mu is suitable, and it should not exceed 4 mu. The pond bottom should be relatively hard, generally with a mud thickness within 10 cm; when it exceeds 10 cm, the mud must be cleared to facilitate the catching (catching) of crucian carp. The pond embankment should be solid and not leak water, and sturdy and reliable fish-blocking screens should be installed at the water inlet and outlet. The fish-blocking screen should be 50 cm higher than the highest water level of the pond.</p> <p style="text-indent:2em;">2. Variety selection</p> <p style="text-indent:2em;">At present, there are many crucian carp varieties sold on the market, and it is inevitable that good and poor ones are mixed. Practice has proved that allogynogenetic silver crucian carp and high-back allogynogenetic silver crucian carp (abbreviated as high-back crucian carp) are suitable for main farming, and their growth speed is 2 times and 3 times faster than ordinary crucian carp respectively. Allogynogenetic silver crucian carp and high-back crucian carp are similar. The differences between allogynogenetic silver crucian carp and ordinary crucian carp are: allogynogenetic silver crucian carp has 31-32 scales along the lateral line, while ordinary crucian carp has 28-29; allogynogenetic silver crucian carp and high-back crucian carp have the same number of lateral line scales, but high-back crucian carp has a short head, high back, thick body, and round abdomen.</p> <p style="text-indent:2em;">3. Stocking density</p> <p style="text-indent:2em;">From the perspective of farming economic benefits, if the stocking number exceeds 2000 fish/mu, although a higher yield can be obtained, the individual commercial fish raised are small, the selling price is low, and the benefit is not ideal; if the stocking number is less than 1000 fish/mu, although the individual commercial fish are larger, the total yield is not high and the sales income is low. Stocking 1400 fingerlings of 30 grams each per mu or 1200 fingerlings of 50 grams each per mu, with an appropriate amount of silver carp, bighead carp and summer grass carp, with the total number of mixed fish not exceeding 600, can achieve a net yield of more than 500 kg of crucian carp and about 200 kg of other fish, giving an ideal effect.</p> <p style="text-indent:2em;">4. Water quality management</p> <p style="text-indent:2em;">The calcium and phosphorus content in the body of crucian carp is more than 2 times that of other fish, so the water is required to be rich in calcium and phosphorus to meet the physiological needs of crucian carp. Apply quicklime solution once about every 20 days, with 60 kg per mu each time; apply superphosphate once every 15 days, with 15-20 kg per mu each time. Superphosphate can only be applied 3-5 days after applying quicklime, to prevent the water from being too alkaline and reducing the effect of phosphate fertilizer.</p>
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What Season Do Crayfish Spawn? A Detailed Explanation of Annual Spawning Frequency and Egg Output
Crayfish are freshwater economic shrimp species, widely welcomed by people for their delicious meat. In summer, they are an indispensable delicacy at late-night food stalls. So do you know what season crayfish spawn? How many times can they spawn in a year? How large is the egg output? According to crayfish farmer Grandpa Li,
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How Big Do Goldfish Get Before Spawning, How Many Eggs They Lay at a Time, and a Detailed Guide to Raising Them
Goldfish are the earliest breed in the history of ornamental fish in the world. They are easy to keep, have unusual shapes and brilliant colors, and are generally golden yellow. So do you know how big goldfish get before spawning? How many eggs can they lay at a time? How do you raise them? According to available information, goldfish usually mature and spawn at 1 year of age, meaning they can reproduce 1 generation per year. If the temperature is raised in winter and feeding management is strengthened, goldfish at 7-8 months of age can also spawn early in the severe cold of winter; they do not necessarily have to reach 1 year (12 months) of age before they can spawn and reproduce. Goldfish can spawn multiple times during the breeding season. In the places reached by the light, small fish will hatch in about a week.
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7 common mistakes in treating pig diseases, how many have you made?
In the process of raising pigs, pig diseases are unavoidable, but there are also mistakes in treating pig diseases. Have you fallen into any of these 7 mistakes below? 1. Using antipyretics in large doses. Many people, when treating pig diseases, often cannot do without antipyretics, such as amino
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What grass do grass carp generally like to eat, and how many jin can they gain in a year?
Grass carp is a typical herbivorous fish. For grass carp weighing more than 2.5 kg, each fish can eat 120-180 g of grass per day. So, what grass do grass carp generally like to eat? How many jin can they gain in a year? What feeding methods are there? Next, let us learn about it together.
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How much does a yellow-margined box turtle cost? A detailed guide to the number of varieties and how to tell males from females
The yellow-margined box turtle generally refers to the yellow-margined box turtle (Cuora flavomarginata), common names: sandwich-board turtle, snake-eating turtle, broken-board turtle, widely distributed. So how much does it cost per turtle? How many varieties are there? How do you tell males from females? Since the market price of the yellow-margined box turtle is calculated using the weighted average method
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Causes and treatments of goldfish fin rot, and how many to keep at home for good feng shui?
Now many people like to keep goldfish at home or in the office. During the process of raising them, some situations are unavoidable. A friend asked: what causes fin rot in home-kept goldfish? How to treat it? Generally how many to keep for good feng shui? Let's take a look below. 1. Gold
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How many eggs does a hen lay in a day, and does it need a rooster? What can it eat to lay more eggs
Eggs are a breakfast staple for many of us. Small as they are, they are nutritious and provide the energy we need. So, do you know how many eggs a hen lays in a day? Does it need a rooster to lay eggs? What can it eat to lay more? Let's take a look below. One
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How many jin can a carp gain in a year, and what feed should be given for high yield?
Carp, with the Chinese aliases li guaizi, lizi, maozi, and red fish. It usually inhabits the bottom layer of rivers, lakes, reservoirs, and ponds where aquatic plants grow densely, feeding mainly on benthic animals. So how many jin can it usually gain in one year? What feed should be given? How should it be raised to
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How much does a pair of bamboo rat breeding stock cost? How long until a beginner's stock is ready for market, and how many should you raise?
The bamboo rat can be said to be a treasure from head to tail; whether it is the skin, or the meat, fur, blood, and so on, all have fairly high value, so it is extremely sought after on the market. Currently, all bamboo rat products on the market sell for a high price, so many people raise them to make money. So how much does a pair of bamboo rat breeding stock cost?
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