CATDOLL : CATDOLL: If a goldfish is about to lay eggs, what are the signs? What are the common symptoms?

1. What are the signs of goldfish spawning? What are the common symptoms?

Generally speaking, the belly of female fish is bigger during the spawning period, while the belly of male fish is not much changed. However, if you observe carefully, you can easily find that there are a few small white spots on the front bony spines of the left and right front fins of male fish, which are particularly obvious during the spawning period, but female fish have absolutely no such spots.

In addition, during the spawning period, the male fish will always chase and bite the female fish's little butt. At this time, it means that the eggs are about to be laid. In this case, the pair of fish should be placed separately in the same fish tank. Put more aquatic plants in the tank so that the eggs can adhere to the aquatic plants. Otherwise, the eggs will sink to the bottom of the water and be eaten by fish. After spawning, the female fish should not be kept together with any male fish for the time being. Let it have a good rest and recuperation to protect the female fish.

Goldfish, like most freshwater fish, lay eggs in spring. If they are well bred, some goldfish will lay eggs again in autumn after laying eggs in spring. However, the quality of eggs laid in autumn is lower, and the hatched fry are also weaker, so they are generally not used in fish farming. Whether spawning in spring or autumn, the water temperature must be maintained at 16°C to 240°C. Spawning in spring is mostly concentrated in April and May, and goldfish can be seen laying eggs almost every day, but the peak period for goldfish spawning is from 4 am to 10 am, especially before and after dawn, when the most eggs are laid.

To make goldfish lay eggs earlier, just build a plastic greenhouse on the fish pond or move the parent fish into a glass greenhouse. When the water temperature rises above 16°C, goldfish will naturally go into heat and lay eggs. In addition, goldfish with a strong body and well-developed gonads lay eggs earlier than those with a weak body and poorly developed gonads. Therefore, strengthening the cultivation of goldfish in the summer and autumn of the previous year can also help goldfish lay eggs earlier. Early spawning can obtain fry earlier, thereby extending the growth time of goldfish, making goldfish grow bigger and stronger, which is conducive to improving the efficiency of fish farming.

2. What are the signs of goldfish spawning? What are the common symptoms?

The signs of a goldfish giving birth are that it likes to be alone, eats less, doesn't like other fish to get close to it, and secretes mucus from its belly, so it won't be long before you see the baby fish come out. You don't need to prepare any food for newly hatched goldfish, as it prefers to eat egg yolk, which can promote its digestion and absorption.

3. What are the symptoms before koi lays eggs?

Koi cannot get pregnant because they are oviparous fish. Oviparous fish means that the female fish directly lays mature eggs in the water, and the male fish needs to discharge semen into the water at the same time to develop into fertilized eggs. Although there are many eggs produced, not many small fish are successfully hatched.

Before koi spawn, their belly will become bigger and they will be restless. There will be male fish chasing them, but they will be quieter than ordinary goldfish, or even no movement. Also, before koi spawn, you should observe whether the fish body is swollen and the abdomen is sagging, which is because the female fish cannot spawn. If you find any of these, you should deal with it in time.

If you find that the koi's belly is getting bigger or it has a poor appetite, it may be that it is about to lay eggs. It is best to put the male and female fish together in advance. If conditions permit, artificial breeding can be selected. If there are not many broodstock, artificial breeding can be used, because the fertilization rate of artificially bred fish eggs is relatively high, and the hatching rate is also relatively high. First, take out the breeding female fish, hold the female fish with your left hand, and gently press the abdomen with the thumb of your right hand, and light yellow eggs will be discharged from the anus. At this time, take out the male fish as soon as possible, squeeze out the semen in the same way, and gently mix it with a feather or brush. After about 15 minutes, you can pour it into the fish nest.

If there are a large number of fish, you can choose natural reproduction. First, put a bunch of phoenix grass in the breeding tank so that the eggs have a place to attach. After the female fish lays eggs, quickly remove them. At this time, a male fish needs to immediately follow and discharge sperm. If it does not discharge, it will not become a fertilized egg. Therefore, the fertilization rate of natural reproduction is lower than that of artificial reproduction.

Koi are not very demanding on water temperature and water quality. The suitable temperature range is 2℃ ~ 30℃, but they cannot resist sudden changes in water temperature. Koi will feel uncomfortable if the temperature difference suddenly exceeds 2℃ ~ 3℃. The optimal water temperature is 20℃ ~ 25℃. They need sufficient oxygen and are suitable for living in a slightly alkaline, low hardness water environment.

Koi cannot get pregnant because they are oviparous fish. Oviparous fish means that the female fish directly lays mature eggs in the water, and the male fish needs to discharge semen into the water at the same time to develop into fertilized eggs. Although there are many eggs produced, not many small fish are successfully hatched.

If the breeder finds that the koi's belly becomes larger or has a poor appetite, it may be that it is about to lay eggs. It is best to put the male and female fish together in advance, and artificial breeding can be chosen if conditions permit.

Koi Spawning:

1. Artificial breeding: If there are not many broodstock, artificial breeding can be used, because the fertilization rate of artificially bred fish eggs is relatively high, and the hatching rate is also relatively high. First, take out the breeding female fish, hold the female fish with your left hand, and gently press the abdomen with the thumb of your right hand, and light yellow eggs will be discharged from the anus. At this time, take out the male fish as soon as possible, squeeze out the semen in the same way, and gently mix it with a feather or brush. After about 15 minutes, it can be poured into the fish nest.

2. Natural reproduction: If the number is large, you can choose natural reproduction. First, put a bunch of phoenix grass in the breeding tank to give the eggs a place to attach. After the female fish lays eggs, it is quickly fished out. At this time, a male fish is needed to immediately follow and discharge sperm. If it is not discharged, it will not become a fertilized egg. Therefore, the fertilization rate of natural reproduction is lower than that of artificial reproduction.

4. How to tell if a goldfish is about to give birth? What is the state of a goldfish when it is about to give birth?

Goldfish lay eggs and then hatch small fish. Generally speaking, the best time for them to lay eggs is in late spring and early summer. The weather is cooler during this period, which is conducive to the reproduction and mating of fish. In different environments, they lay small fish at different times. If they are raised in the south where the climate is warmer, their spawning time will be 1 to 2 months earlier than in the north. Specifically, fish living in the south lay eggs between March and April every year, while in the north it is from April to June. After the fish lay eggs, the small fish will hatch in about a week.

Goldfish will have obvious signs when they are about to give birth. During pregnancy, you can see that the female fish's abdomen is very swollen. But when it is about to give birth, you can see obvious fetal spots appear at the end of the abdomen near the tail. Its anus and reproductive opening are slightly raised. A few days before giving birth, the female fish will become very alert and almost stop eating. It mainly hides in corners or among water plants. If the female fish meets all of the above characteristics, it means that it is about to give birth.

Additional information

Goldfish (Carassiusauratus) is also known as golden crucian carp. It is a carp fish that evolved from wild red and yellow crucian carp. As early as the Jin Dynasty, there were written records of "red-scaled fish" - goldfish, which can be regarded as the quintessence of China. Goldfish is one of the three most famous ornamental fish in the world. It originated in China and has a history of more than 1,700 years.

Morphological characteristics: Goldfish and crucian carp belong to the same species in taxonomy. Compared with crucian carp, goldfish has a huge variation in external morphology, but the whole body of the fish can be divided into three parts: head, trunk and tail. The front end of the head is the mouth, and the back has the nose, eyes and gill cover. Some species have a tumor on the upper part of the head, some species have a pompom above the nose, some species have protruding eyes, facing upward or with bubbles, and some species have gill covers exposed to form flipped gills. The trunk of the goldfish is covered with scales, mainly normal scales, transparent scales and pearl scales. There is a lateral line on its side, and the number of scales on the lateral line, scales below the lateral line and scales on the lateral line of different species of goldfish is not the same. The trunk of a typical goldfish has pectoral fins, pelvic fins, anal fins, dorsal fins and caudal fins, and some species do not have dorsal fins or anal fins. The tail of a goldfish is composed of a caudal peduncle and a caudal fin, and the shape of its caudal fin varies.

Living habits: Goldfish are gentle and generally live about 6 years, but some live longer. Goldfish are omnivorous and carnivorous freshwater fish with well-developed throat teeth that can swallow harder bait. Goldfish have a strong adaptability to water temperature, but cannot adapt to drastic changes in temperature. The suitable water temperature is 18-26℃. Too high or too low temperature will affect the feeding, growth and reproduction of goldfish. Goldfish like weakly alkaline water, and the pH value of the water body is more suitable at 7.5-8.0. At the turn of spring and summer in northern my country, when the water temperature begins to rise, goldfish also enter the breeding period. During this period, the water temperature is controlled at around 20℃, which is more conducive to the spawning and hatching of goldfish.

Distribution range: From a global perspective, goldfish farming is mainly concentrated in Asia, with the largest scale and the widest influence in Thailand and Japan. In addition, goldfish are also distributed in Indonesia, Malaysia and Singapore.

At present, all provinces except Tibet have goldfish farms or ornamental fish trading markets. There are four major goldfish production areas in China, namely Fuzhou, Beijing-Tianjin, Suzhou-Hangzhou, and Guangzhou. Among them, Fuzhou ranks first. In 2017, there were nearly 60 goldfish farms in Fuzhou, covering an area of ​​133hm2 and more than 80 varieties. It is known as the "China Goldfish Capital".

Disease prevention and control: For courtyard breeding, prevention should be the priority, timely diagnosis and symptomatic medication should be used. Especially in winter and spring, goldfish are weak due to lack of movement for a long time in winter and insufficient sunlight, so this time is the most likely time for them to hide. In early spring every year, you should keep them in the sun to enhance their physical fitness. Disinfect the fish pond and breeding tools for ornamental fish. Combined with pond cleaning and water change, use strong chlorine solution to spray on the pool wall and bottom, or use 3% Nacl solution or 20mg/L KMnO4 solution and other small water body medicine baths, disinfect for 20-30 minutes, then rinse with clean water for use, net cages, scoop nets and other tools are regularly disinfected with disinfectants, and in the season of fish disease epidemics, on the basis of spraying drugs to disinfect the entire pool, feed medicated bait regularly. And pay special attention to prevent the harm of cats, mice, frogs and related water birds.

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