Instructions for preparing an aquarium for the settlement of fish is very simple. Purebred guppy fish will feel great in an aquarium of at least 50 liters with a water acidity of at least 6.6-7 pH. For simple guppies, you need flowing tap water, which is best to insist for 24 hours and pass through an aqua filter. The water temperature is preferably at least 18 ° C, otherwise the fish will get sick. 24-26 ° C - the optimum temperature. At temperatures above the permissible level, the fish become smaller and do not live long.
Watch a short video on how to care for guppies.
Guppies are highly active, so it’s better to keep the aquarium closed so that they don’t jump out. Cover the bottom of the aquarium with large river sand, small stones and plant bushes in which fish can play and hide. For thoroughbred guppies, special settings are needed that will filter the water, saturate it with the necessary amount of oxygen. One should not forget about the lighting - alternately combining the light of the sun and the lamp.
Full care for aquarium inhabitants is impossible without proper feeding. A large amount of guppy food will not be eaten, it can settle at the bottom of the aquarium, spoiling the water. Do not neglect the live food: you can give artemia, rotifers, mosquito larvae and daphnia. It is better to feed once a day, dividing the portions into several chips with an interval of several hours. Modern fish food will help maintain an optimal balance of vitamins and minerals in the body. Alternate live and dry food so that the fish do not have disorders of the digestive system.
Guppies breed easily in an aquarium. Caring for producers during the spawning period does not require special preparation. There are a few points to consider to avoid trouble. Fish become adults at the age of 4 months. When a female has an angular belly, then she is ready for childbirth. Transfer it to a separate aquarium or a jar of water, after the appearance of the babies, the female can be transplanted back. In order to avoid cannibalism, it is better to keep fry in spawning until puberty. The first feed is shredded daphnia and cyclops. At 2-3 months of life, you can give live food.
Do not forget to maintain cleanliness in the aquarium. Full care requires the removal of food residues and the replacement of 1/3 of the water weekly. New water should be the same in temperature and acidity as the main one. To avoid disease, periodically add 1 teaspoon of salt (10 liters of water) to the water.
Guppies are in good contact with small fish, but can be aggressive to the fry, or become victims of large fish. For general safety, it is better to keep them in groups of several individuals in the same aquarium.
Additional tips
Guppies are unpretentious fish that can live without aeration and filtration of water. These are viviparous animals, like sharks, although they are distant relatives, their care is very simple.
What else should you pay attention to before preparing for the settlement of guppies, and after? First, pick a big can - the bigger the better. Secondly, do not use old glass jars or plastic bottles that already emit toxic substances. Thirdly, it is difficult to place a filter in small jars, so all the “dirty” work will have to be done personally — wipe the inside surface of the container with a clean sponge, siphon the bottom, and replace the old water with fresh water every week. Fourth - do not put the jar or aquarium in place of direct sunlight. This can lead to water bloom and the death of animals. Fifth - with the help of a thermometer monitor the temperature.
Care for such fish is a pleasure! Even a novice aquarist will not be afraid to admit that the first experience of keeping fish is associated with guppies. Simple species are less whimsical than breeding species that require strict maintenance. In any case, these cute creatures are a real aquarium miracle.
Gupika fish: how to care
Guppy is a small size viviparous fish. Males are so bright in color that it is impossible to take your eyes off. They are so unpretentious to the conditions of detention that they feel good in the aquarium, even without a filter and aeration of water. Therefore, these fish are ideal for busy people who do not have time to care for the aquarium.
Guppy content in the aquarium
Of course, you can keep a few fish in a 3-liter jar, but they will be cramped and uncomfortable there.
For example, if it is planned to settle no more than 15 individuals, then a 30-liter aquarium is enough.
Priming and decorative items can be selected such that they will like. It should not be forgotten about aquarium plants: they not only produce the necessary oxygen, but also serve as shelter for fry from adult fish.
Temperature water can vary from 18 to 30 degrees. However, 24 degrees is the best option for healthy development and reproduction. To maintain this temperature, it is advisable to purchase a special heater in the pet store for an aquarium that has a water heating regulator.
Artificial lighting in the dark is optional. However, experienced guppy lovers still install additional lighting. Thanks to him, algae grow better and the colors of the fish become much brighter and richer.
To maintain the aquarium in a tidy condition, it is enough to change one third of the water of the total volume once a month. Before that, it is desirable to defend it in an open container for several days.
Guppies love hard water (from 6 to 10 units), however, if we consider the quality of tap water, it is better to get rid of excess sediment. It should be remembered that inject water into the aquarium only at room temperature.
Otherwise, such abrupt changes in the aquatic environment can lead to disruption of the development of fish or even weakening of the immune system and the appearance of diseases.
If we are very lazy to care for the aquarium and do not change the water, then it is advisable to install a compressor. He perfectly cope with the purification of water from the remnants of food and other dirt, thereby it will get rid of unnecessary trouble.
There is no point in setting an aerator for saturating water with air, except for beauty, you can hold special tubes at the bottom of the aquarium that allow bubbles. Guppies are undemanding to oxygen, so it is enough to plant some algae in the ground. Plants absorb carbon dioxide and give the aquarium natural beauty.
Guppy feeding regimen and diet
The health, color and longevity of guppies largely depends on the quality and quantity of food. These fish are remarkable in that they are not picky about food.
In general, all food is divided into two groups: dry and live. Algae flakes, daphnia and fortified granules are considered dry. A live food can be considered all seafood, which is almost daily consumed in food: minced fish fillet, octopus, shrimp and even meat.
Guppies especially love bloodworms, but do not abuse them, because an excessive amount will only pollute the aquarium.
As for the amount of food, it is best to feed the fish several times a day. Depending on age, you can give 1-2 pinches of food at a time.
Fattening your pets is also not an option, because obesity can affect the lifespan and productivity of offspring.
Special attention should be paid to fry. At first, they feed on daphnia, but in a packet the food is too large for them. Therefore, it will not be superfluous to rub it with your fingers as small as possible.
Habitat in nature
The homeland of the guppy fish is Trinidad and Tobago, and in South America, in Venezuela, Guyana and Brazil. As a rule, they live in clean, running water, but they also like brackish coastal waters, but not saline sea water. They feed on worms, larvae, bloodworms and various small insects. Because of this peculiarity, they were even massively settled in areas where there is a lot of anopic mosquito, as guppies eat its larvae. Males of guppies in nature are much brighter than females, but still their coloring is far from aquarium breeding forms. She must protect them from predators, as the fish is small and defenseless. Wild guppies in nature:
Guppy fish are named after their discoverer (Robert John Lechmere Guppy), Robert Guppy was the first to find and describe this fish on Trinidad Island in 1866.
Compatible with other fish
Very peaceful fish that does not cause any trouble to the neighbors. But it can offend, especially large and predatory fish, which gupeshek perceive only as food. So with fish like slaughter, giant gourami, pangasius or shark ball it is not worth keeping. It is also impossible to keep with fish that can tear off male guppies with fins - Sumatran barb, Denison barb, fiery barb, some gourami, such as kissing, with ternitsemi. Guppies get along best of all with peaceful and small fish: - rastori, cardinals, congo, neons, cherry barbs, speckled catfish, tarakatuma.
Guppy breeding
Summarizing
Guppy aquarium fish - easy and detailed about them
Habitat in nature
The homeland of the guppy fish is Trinidad and Tobago, and in South America, in Venezuela, Guyana and Brazil. As a rule, they live in clean, running water, but they also like brackish coastal waters, but not saline sea water. They feed on worms, larvae, bloodworms and various small insects. Because of this peculiarity, they were even massively settled in areas where there is a lot of anopic mosquito, as guppies eat its larvae. Males of guppies in nature are much brighter than females, but still their coloring is far from aquarium breeding forms. She must protect them from predators, as the fish is small and defenseless. Wild guppies in nature:
Guppy fish are named after their discoverer (Robert John Lechmere Guppy), Robert Guppy was the first to find and describe this fish on Trinidad Island in 1866.
Content difficulty
Feeding guppies
Guppy content in the aquarium
Like all tropical fish, guppies love warm waters (22-25 ° C), but can live in a wider limit of 19.0 - 29.0 ° C. As for the parameters of water, for ordinary forms it is almost irrelevant. They adapt to local conditions so quickly that they move to a new aquarium without any problems at all. It would be ideal if the aquarium will have: 7.0 - 8.5, and a stiffness of 12.0 - 18.0, but the parameters can be completely different, which does not hurt the guppy to live and reproduce.
The aquarium may be small, 20 liters will be enough for 5 fish. But, the greater the volume, the greater the number of fish you can keep and the more beautiful it will look. It is best to have a lot of plants in the aquarium, as it will be similar to the natural habitat and will significantly increase the survival of the fry in the general aquarium. Lighting can be any, from bright to twilight.
It is advisable to use a filter, for gupeshek quite internal enough, but if there is an external, then great. Only it is better to close the holes in it with an additional small net, as a powerful filter is not only able to suck fry, but even an adult fish.
A guppy cannot be called a schooling fish, but there is almost no point in keeping it with a pair. It is very small in size and in small quantities is almost invisible in an aquarium. For guppies, the rule is simple - the more there are in the aquarium, the more impressive and beautiful they look.
Compatible with other fish
Very peaceful fish that does not cause any trouble to the neighbors. But it can offend, especially large and predatory fish, which gupeshek perceive only as food. So with fish like slaughter, giant gourami, pangasius or shark ball it is not worth keeping. It is also impossible to keep with fish that can tear off male guppies with fins - Sumatran barb, Denison barb, fiery barb, some gourami, such as kissing, with ternitsemi. Guppies get along best of all with peaceful and small fish: - rastori, cardinals, congo, neons, cherry barbs, speckled catfish, tarakatuma.
Gender differences
Guppy breeding
Why do guppies tear their tails?
There may be a lot of reasons, but the most common is old water, which is rarely replaced. It accumulates ammonia and nitrates, and they poison the fish and destroy the fins. Regularly change the water to fresh. There may also be a sharp change of water, injury or poor feeding, when there are few vitamins.
If the guppy has lost its tail, then this is an alarming sign - either someone breaks off its tail, and you need to carefully study the fish with which it is kept, or it has become infected with an infectious disease, and you need to look more closely at the rest of the fish.
Why does the guppy have a spine curve?
Such fish are found in almost any species, as a rule it is a defect from birth. If this happens in adult fish, then this may be due to the fact that it is contained in too close an aquarium, with a large number of fish. In guppy, the spine curls from the same age, and this is normal, but the most common cause is fish tuberculosis or mycobacteriosis. The disease is complex, and its treatment is not easy, does not always bring results. In order to avoid the spread of infection, these fish are better isolated.
Do I need oxygen and filter for guppies?
Not required, but desirable. You can buy an inexpensive, internal filter with a washcloth. It will perform its functions well enough and will not suck the fish into itself. Consider that if you bought a filter, and it is set higher (so that the surface of the water in the aquarium was in motion), then you should not need to buy additional aeration or, more simply, oxygen.
Why do guppies float on the surface?
They breathe oxygen dissolved in water, and in your aquarium it is not enough. Because of which? Maybe it’s too hot, maybe you haven’t cleaned the aquarium for a long time and didn’t change the water, perhaps too closely. Be sure to turn on aeration or filtration (place the filter closer to the surface of the water to enhance gas exchange) and replace some of the water with fresh one.
Why do guppies stick together or stick together?
Unfortunately, the exact cause can not be named, even if the aquarium is near you. This may be improper feeding (monotonous, only dry food or abundant), there may be unsuitable water parameters (a lot of ammonia), and there may be a disease. The minimum that needs to be done is to replace part of the water, siphon the soil and change the type of feed.
Care for guppy fry
The most unpretentious of the fry, survive in the wild. But, if you regularly change water, feed so much that they eat in a couple of minutes and feed the fry two or three times a day, they will quickly grow, color and delight you. What to feed the guppy fry? There are no difficulties in feeding, they eat crushed flakes, but it is better to give Artemia naupilii or shredded strawberry.
The reason for the popularity of guppies
These fish are great for children - so easy to care for them. The presence of fish will bring up the responsibility of the child. Of course - one of those fish that are recommended for beginners.
But also experienced aquarists guppies are suitable, because in guppy fish breeding occurs very easily, which makes it possible to engage in selection. New species become capricious to the conditions of detention, hardly divorced, so it will not be boring.
Gender differences
Guppy breeding
Frequently asked questions about guppies
What kind of fish can you keep with a guppy?
Some species have already been listed above, but you can still see the article - the 10 best fish for beginners, everything on this list is good for keeping with guppies.
How to find out that a guppy is pregnant or is going to give birth?
Usually the female guppy gives birth to fry once a month, but the timing may vary depending on water temperature and conditions of detention. Note the time since the last time she gave birth, and watch. The female is ready for new genera, the stain becomes darker, it is visible the fry eyes.
How do guppies breathe?
Like all fish - oxygen dissolved in water, do not forget to include aeration and filtration.
How long do guppies live?
About two years, but it all depends on the conditions and temperature. The higher the temperature of the water, the shorter their life. Some fish live up to 5 years.
How often to feed guppies?
Daily, and in small portions two to three times a day. For example, in the morning and in the evening. Once a week, you can arrange a hungry day, but keep in mind that the fish will actively look for food and the first victims will be their own fry.
Why do guppies tear their tails?
There may be a lot of reasons, but the most common is old water, which is rarely replaced. It accumulates ammonia and nitrates, and they poison the fish and destroy the fins. Regularly change the water to fresh. There may also be a sharp change of water, injury or poor feeding, when there are few vitamins.
Если же у гуппи пропал хвост, то это тревожный знак — либо кто-то ей ее обрывает, и вам нужно внимательно изучить рыб с которыми она содержится, либо она заболела инфекционным заболеванием, и вам нужно еще более внимательно присматриваться к остальным рыбам.
Почему у гуппи слипся хвост?
Опять же — либо старая и грязная вода, либо инфекция, либо скудное кормление. Попробуйте сменить по 20% воды раз в неделю и следите за состоянием других рыб.
Почему у гуппи кривой позвоночник?
Such fish are found in almost any species, as a rule it is a defect from birth. If this happens in adult fish, then this may be due to the fact that it is contained in too close an aquarium, with a large number of fish. In guppy, the spine curls from the same age, and this is normal, but the most common cause is fish tuberculosis or mycobacteriosis. The disease is complex, and its treatment is not easy, does not always bring results. In order to avoid the spread of infection, these fish are better isolated.
Why do guppies give birth only to females?
The exact answer to this question is not found. Apparently with an excess of males, the laws of nature are included and the population compensates for the females in order to preserve itself.
Is it possible to contain only one guppy in an aquarium?
It is possible, although it looks like something sad ... All the same, this is a cheerful and brisk fish that loves company. If you are looking for a fish that would be beautiful, unpretentious and live wonderfully, then look towards the rooster.
Do I need oxygen and filter for guppies?
Not required, but desirable. You can buy an inexpensive, internal filter with a washcloth. It will perform its functions well enough and will not suck the fish into itself. Consider that if you bought a filter, and it is set higher (so that the surface of the water in the aquarium was in motion), then you should not need to buy additional aeration or, more simply, oxygen.
Do guppies need soil and plants?
This is your choice. An empty aquarium is easier to clean, but it looks worse, the fry cannot survive in it, and the gupies themselves love to frolic among the plants. I am for an aquarium with soil and plants.
Do you need a guppy light?
No, the fish do not need light at all, except that it falls on the aquarium during the day. Light is needed for plants to grow.
Guppy spawn?
No, they are viviparous. That is, the fry is born completely ready for life and can swim at once. Sometimes it falls in the egg, but it breaks and it floats. Sometimes he has a yolk sack, which he quickly assimilates.
Do guppies sleep?
Yes, but not like people. It is rather an active holiday, when at night the fish reduce activity, but still swim. And it's better to turn off the lights at night, although some do not, but is it dark in nature at night?
How many fry do guppies give birth?
Depends on the female, her age and size. Usually about 30-50 pieces, but sometimes 200
How much does a guppy fry grow?
Very fast in good conditions. Males become mature in two months, and females in three.
Can guppies be kept in seawater?
No, they tolerate poorly salted water, but they die in the sea, this is a freshwater fish.
Why do guppies float on the surface?
They breathe oxygen dissolved in water, and in your aquarium it is not enough. Because of which? Maybe it’s too hot, maybe you haven’t cleaned the aquarium for a long time and didn’t change the water, perhaps too closely. Be sure to turn on aeration or filtration (place the filter closer to the surface of the water to enhance gas exchange) and replace some of the water with fresh one.
Why do guppies jump out of an aquarium?
They can do it both by chance and because of bad water - for example, if it has not been changed for a long time and the ground is not siphoned in the aquarium. Also, the reason may be a small amount of oxygen in the water, read about it above.
Why do guppies stick together or stick together?
Unfortunately, the exact cause can not be named, even if the aquarium is near you. This may be improper feeding (monotonous, only dry food or abundant), there may be unsuitable water parameters (a lot of ammonia), and there may be a disease. The minimum that needs to be done is to replace part of the water, siphon the soil and change the type of feed.
What kind of catfish can you keep with a guppy?
Any small. More or less large catfish, almost without exception predators. The only exception is tarakatum, it is quite possible to contain it with guppy. Well, any corridors, such as speckled, will get along great with guppies and will be very useful, eating the rest of the food from the bottom.
Care for guppy fry
The most unpretentious of the fry, survive in the wild. But, if you regularly change water, feed so much that they eat in a couple of minutes and feed the fry two or three times a day, they will quickly grow, color and delight you. What to feed the guppy fry? There are no difficulties in feeding, they eat crushed flakes, but it is better to give Artemia naupilii or shredded strawberry.
Guppy content care spawn photo video description compatibility.
Conditions of detention
Aquarium Ground
Breeding spawning
COMPATIBILITY WITH OTHER FISH
The reason for the popularity of guppies
These fish are great for children - so easy to care for them. The presence of fish will bring up the responsibility of the child. Of course - one of those fish that are recommended for beginners.
But also experienced aquarists guppies are suitable, because in guppy fish breeding occurs very easily, which makes it possible to engage in selection. New species become capricious to the conditions of detention, hardly divorced, so it will not be boring.
Habitat in nature
Gender differences
Suitable conditions for spawning
Guppies are so unpretentious that they can even have offspring in a 4-liter aquarium. However, beginners are not recommended to start such small houses for fish. The smaller the displacement, the harder it is to care for the fish and establish the optimal natural balance. Ideally, one aquarium should be a haven only for certain species of fish. But, such an attachment to this breed very few people feel. The aquarium is much more interesting and colorful if there are several different fish living in it. The neighbors of these peaceful fish should be treated very carefully. Putting the barbs or cockerels, you condemn guppeshek harassment. In addition, these fish are not averse to eat fry.
To breed guppies you need an aquarium with an abundance of greenery. Thickets of plants are excellent shelter for fry. Pay attention to the Javanese moss, which is considered an ideal refuge for the young.
As the main green you can use:
- Canadian Elodea,
- Peristolist,
- Hornpaw, etc.
Guppies are thermophilic, so the temperature of the reservoir should not fall below 22 degrees. If there is a possibility of cooling water below the permissible level, then it is better to equip the pond with an automatic heater. If the number of aquarium is less than 1 fish 2.5 liters, then you can do without aeration system and filter. In addition, there is a possibility that very tiny fry may get into the filter element with water and die there. To avoid this, special foam nets at the water inlet opening will help. If it is not possible to buy it, then simply wrap the tube with a cloth.
Mating two fish
The only necessary condition - the temperature of aqua should not be below 23 and not above 28 degrees. Guppies are completely indifferent to the parameters of water.
For fertilization, the male swims to the female from below. It is noteworthy that after one portion of sperm, the female is able to give birth three times. Aquarists who do this professionally know that for broods of hybrid breeds it is necessary to count at least 3 times, and only the next to take offspring from the necessary male.
The gestation period varies about a month. This parameter depends on the temperature, the female and the number of future fry. On average, each female gives birth to 50 tadpoles, but there are cases when the number is in the hundreds. It lasts for several hours.
The question of how to determine a pregnant female guppy is most often asked by novice aquarists. The easiest way to determine the interesting position of the pet - look at the abdomen. A black speck forms on the body of the female and the belly is significantly rounded. The female looks thicker and much harder to move.
At the time of birth it is necessary that there are enough plants in the aquarium for shelter. Otherwise, the fry will be eaten by the mother. On the first day of their lives, tadpoles do not need additional feeding. After you have removed (or have not removed) adult individuals, put small dry food, special food for fry or ground live dust into the aquarium. The fry are still too small to cope with daphnia or Cyclops, so it’s worth waiting for these kinds of feed. A month later, the fry appear sex differences. The male becomes more beautiful than the female, and the female is ready for childbirth.
Living conditions
Guppy can live all his life even in a three-liter jar, but it is worth noting that in this case its coloring will not be very diverse, rather the fish will remain mostly gray and uninteresting. Quite another thing is if the fish is placed in an aquarium with a volume of 5-10 liters. Its coloring will become brighter after a while. In male guppies, you can see all sorts of shades on the tail fin and body (orange, blue, purple, red), if you follow a certain temperature regime, the purity of the water, the necessary hardness.
The water temperature can vary from +18 to + 30 ° C, but the most acceptable for growth and development is from +24 to + 26 ° C. For breeding, females require temperatures above 26 ° C, while lower thermometer indicators — 18–22 ° C — are optimal for rearing large-sized individuals and increasing life expectancy.
Soil is best suited medium grain, dark color. Against the background of his gray and not expressive females look more colorful than in fact, and the males of bright and interesting colors will shimmer more. It is better to plant the back wall of the aquarium with aquatic plants so that the fish, especially the young, can hide. A relatively new species of guppy - Endler's guppy, or dwarf guppy. It was discovered by the scientist John Endler in the waters of Venezuela. Adult males have a size of no more than 2 cm.
Quiet neighborhood
Guppies are peaceful and calm fish, so they can easily get along with other species. Only it is necessary to select species that are also not aggressive, since they can attack beautiful, voile tails of innocuous, untouching guppies. Females sometimes eat their young, so if guppies are raised specifically, after breeding, the fry should be caught and placed in a container where most of the water comes from the old habitat.
Clean the aquarium once a week. To do this, a special tube is collected from the bottom of fish waste, pollution on the walls. Clean carefully so that 60-70% of the old water remains in the tank. Guppies prefer to eat live food, but it is suitable and dry. It is necessary to feed often, but in small portions. Once a week it is preferable to do a fasting day.
Guppies are interesting fish of various colors that do not require complex care and high costs, so even a child can afford such pleasure.
How to distinguish the female from the male?
Unlike other types of fish, the sex of a guppy is very easily determined visually. First of all, males in length grow from 2 to 4 cm. They have a bright color and a long flowing tail.
The growth of females can reach up to 6 cm. The most interesting thing is that they look inconspicuous and have a short tail, on which sometimes there can be only small bright spots. In appearance, the female is several times larger than the male and has a dark speck from the bottom of the abdomen. Surprisingly, the female can produce from a few dozen to one and a half hundred fry at a time.
Summarizing
So, guppies are very small and very beautiful inhabitants of the aquarium. Males are amazing color, and females - the ability to reproduce a large number of fry. At the same time fish unpretentious in the care and food. And reproduction does not cause much difficulty. Enough to observe the temperature, provide a balanced diet and have time to transplant the female from the aquarium.
Video about guppy fish: care and maintenance in an aquarium
Is it difficult to contain guppies?
- Guppies are unpretentious in nutrition, they do not require gourmet food. Usually, adults are fed dry, frozen or live food. The fry eat the same ground feed. You can choose food in the form of flakes, granular composition or other varieties. As for live food, they usually give a pipe worker, a bloodworm, a chopper, artemia.
- It is worth remembering forever that these members of the water family have a small oral cavity, the same can be said about the stomach. Therefore, it is necessary to feed the fish often, but in small portions. Usually, food is given three times a day, for one meal a guppy should take 3 minutes maximum.
- Guppies have poor motility of the digestive system, therefore, products with high concentrations of plant compounds should also be given. Twice a week are given such foods that are saturated with vitamins and all necessary.
- It is necessary to allocate in a separate order dry food. Let's take daphnia, which is sold by weight in stores and markets. Such food is given no more than once a week, because in its essence daphnia is only dry shells. In moderation, they are useful, but in large quantities can significantly harm.
- If you feed your little guests three times a day, and one of the meals remains uneaten or the fish do not eat it completely, then the feeding needs to be changed. Give the fish food twice a day in the same portions. Try to feed the guppies at the same time so that they get accustomed and are not in search of food. Otherwise, these fish will eat their fry.
How to distinguish male from female
- Sex differences of the individuals under consideration are obvious. It is for this reason that you will not have any difficulties with this.
- Males are much smaller than females. They also differ noticeably slim. In males, you can see a large tail fin.
- The females of the species under consideration are rather large. They have a fairly large and rounded belly. Also, females have a less bright color.
- Even younger individuals can already be distinguished. It's pretty obvious. Fry, which earlier began to acquire a brighter color, grow males.
