Are shrimps found in the Baltic Sea. Decorative aquarium shrimp. Pictured are prawns

28.10.2019

Sea delicacy - shrimp. One of the most valuable products that the sea gives us. They don't write odes about shrimp. They contain a lot of vitamins and nutrients, maintain normal hormonal levels, promote normal growth and development, and increase immunity. They are used in dietetics and even in the treatment of cancer.

Where do they live?

Decapod crustaceans live practically in the seas of the whole world, and some have mastered fresh water for living. Some adult shrimp reach three centimeters in size, but there are those that reach seven centimeters.

A large number of shrimps inhabit the shores of Japan, China, India, and Southeast Asia. They are warm-blooded and cold-blooded, the first individuals are always large and are caught in the waters of Thailand, Brazil, and China. Cold-blooded shrimp are smaller, live in the northern seas, and are considered to be tastier than warm-blooded ones.

The most convenient place for breeding decapods is the Pacific Ocean, here they have all the conditions for life, so the islands of Somalia, Latin America, Brazil, Ecuador are famous for their large and tasty shrimp.

Here, deep-sea mining is carried out on an industrial scale. Here, the prey immediately undergoes heat treatment and freezing, it is believed that the quality of these marine animals is higher.

Belgium is famous for the old way of catching crustaceans. They attract tourists with nets, baskets and with the help of horses.

And in Russia, shrimp can be caught in the Far East, here the coast delights with almost a hundred species of shrimp. Two species live in the Black Sea, one lives on sandy soil, at the bottom, where there are small pebbles, the second on rocky areas, near rocky shores.

One of the most delicious is the shrimp caught in the Sea of Azov. The Baltic Sea, the North Sea, the waters of the Transcaucasus and even the Amur River are rich in this pure protein, which is small in size, but tasty.

It is necessary to catch shrimps at night or in the evening, you can set traps in advance so that you can harvest in the morning. The habitat of these crustaceans is at a depth of six hundred centimeters to one and a half meters, where there is a large accumulation of algae so that it can hide from danger.

Be sure to have information about the ebb and flow of your reservoir. The most convenient time for fishing is low tide, hours are evening or night.

"Handy" tools for catching shrimp

There are many ways to catch shrimp. The most commonly used trawl or.

A metal semicircle, a rectangle, most often made of aluminum, to which a 3 or 4 meter bag with small cells is attached, like a fishing net, is called a trawl.

There are two types of trawls - mid-water and bottom trawls. 4 long ropes are tied to the trawl, for which you need to pull so that this device moves behind you along the bottom of the reservoir.

The net must have a long, strong handle and a bag with a very small cell, if the cells are not small, then the shrimp will simply slip out of the net. The net must be large enough in diameter.

And you can make a trap for catching shrimp. To do this, take a small mesh and sew it in the shape of a pipe, pass a piece of galvanized wire inside the nylon pipe. Since it is in the form of a spiral, it will keep the rings trapped.

It will be enough two or three turns inside and one outside. The first and last ring is fixed, and an even circle is obtained. Now you can sew a small pipe to the other end of the wide pipe, and the edges of the wide pipe need to be attached to the outer rings.

You also need a flashlight to catch this delicacy, because any small mollusk tends to light in the dark.

How to increase the catch of fish?

For 7 years of active passion for fishing, I have found dozens of ways to improve the bite. Here are the most effective ones:

Biting activator. This pheromone additive lures fish the most in cold and warm water. Discussion of the Hungry Fish bite activator.
Raise gear sensitivity. Read the appropriate manuals for the particular type of tackle.
Lures based pheromones.

Clam fishing rules

Ostdenkerk - a place where shrimp are caught on horseback

The trawl catches shrimps either in the coastal zone or on a deserted coast, in places where there is a lot of algae. They pull the trawl against the current, being waist-deep in a pond. When the current changes, the trawl is moved so that it again stands against the current. In this way, you can catch a lot of shrimp in a short time.

It is easier with a net, you need to enter the water, go around all the stones and drive the net around them. You can catch shrimp like that, but not very much. But if you walk along the shore with the same net in the evening or at night, and even with a flashlight, then the result will please the night hunter.

And homemade traps are tied together and thrown into the pond.

An interesting way of fishing from the Black Sea fishermen.

They catch shrimp in two ways:

One, "old as the world" with a sealed lantern that runs on LEDs.
Another original one is that in the morning they release a net with small meshes with a piece of missing meat from a boat near the high rocky shores. Literally in half an hour they have a great catch.

Reminder about catching a decapod crustacean

You can catch a mollusk from any place convenient for you - from a boat, from a pier, from the shore, the main condition is that the radius of your net is equal to the depth of the place where you are fishing. Give the net time to sink to the bottom and begin to pull it out with a rope.

When pulling the net, the rope will tighten, taking the shrimp with it. Pull it out and keep in mind that in addition to shrimp, you will find some other seafood there in the form of mud, sand and silt.

In the absence of a trawl, net or net, you can use elementary gauze, which is sold in a pharmacy. Fold it in several layers, tie some kind of load on the two ends, lower it to the bottom, next to the shore. Walk parallel to the shore and pull your new "net" along with you for several tens of meters. Then take it out and enjoy the catch.

Season for catching decapods

But you can’t hunt shrimp all year round; during the spawning period, catching them is prohibited. This period is from June 1st to August 31st.

In some places it is forbidden to catch shrimp with a trawl, but it is possible with a trap. Sakhalin fishermen could catch shrimp in the summer without any restrictions.

In the Black Sea, it was forbidden to catch mollusks, or rather, one person can catch no more than five kilograms. The government also banned shrimp fishing in the Crimean peninsula. Employees of the Eastern Black Sea Guard carried out daily raids along the coast.

In the Sea of Azov, until the beginning of August, shrimp fishing could be penalized. In the Sea of Azov, one person, when catching crustaceans, is allowed to use a net with a diameter of no more than seventy centimeters and can catch no more than one kilogram.

Shrimp - hobby, delicacy and harm

Whether you are an amateur or a professional, shellfish fishing is an unforgettable experience. Perfect weather, warm water, sun and your favorite hobby, what could be better?

And if we also keep in mind what can be built from this living creature, what dishes to cook and what benefits to bring to the body. It is possible to strengthen the cardiovascular system, normalize the central nervous system, reduce blood clotting. A person will receive the daily norm of iodine by eating only fifty grams of shrimp.

But people with high cholesterol in the blood should abandon this delicacy, since they themselves contain cholesterol, salts of heavy metals, and toxic substances.

Shrimps are crustaceans, which are representatives of the squad of decapod crayfish. They are widely distributed throughout the world's oceans. The length of an adult shrimp does not exceed 30 centimeters with a weight of 20 grams.

Science knows more than 2,000 individuals living, including in fresh waters. The taste qualities of shrimp led to the fact that they became an object of industrial production. Today, the practice of cultivating shrimp is widespread in the world.

Shrimp Features and Habitat

Shrimp are unique animals in terms of the structure of the body. Shrimp Features are in their anatomy. Shrimps are one of the rare crustaceans that shed and change their shells.

Her genitals and heart are located in the head area. There are also digestive and urinary organs. Like most crustaceans, shrimp breathes with gills.

The gills of the shrimp are protected by a shell and are located next to the walking legs. In the normal state, their blood has a light blue color, with a lack of oxygen, it becomes discolored.

shrimps inhabit in almost all major water bodies of the world. Their range is limited only to the harsh Arctic and Antarctic waters. They have adapted to life in warm and cold, salt and fresh water. The largest number of shrimp species is concentrated in the equatorial regions. The farther from the equator, the smaller their population.

The nature and lifestyle of the shrimp

Shrimps play an important role in the ecosystem of the seas and oceans. They clean the bottom of reservoirs from the remains of tubifex, aquatic insects and fish. Their diet consists of rotting plants and detritus, the black ooze formed from decaying fish and algae.

They lead an active lifestyle: they surf the bottom in search of food, crawl along the leaves of plants, clearing them of snail leeches. Shrimp maneuverability in the water is provided by walking legs on the cephalothorax and abdominal swimming legs, and the movements of the caudal stalks allow you to quickly jump back and scare off your enemies.

Aquarium shrimp perform the functions of a nurse. They rid the reservoir of fouling with lower algae and feed on the remains of the dead "brothers". Sometimes they may attack sick or sleeping fish. Cannibalism among these crustaceans is rare. Usually it manifests itself only in stressful situations or in conditions of prolonged hunger.

types of shrimp

All known science species of shrimp are divided into four groups:

Warm water;
Cold water;
Saltwater;
Freshwater.

The habitat of warm-water shrimp is limited to the southern seas and oceans. They are caught not only in their natural habitat, but also cultivated in artificial conditions. More than a hundred species of warm-water shrimp are known to science. Examples of such mollusks are black tiger and white tiger shrimp.

Pictured is a white tiger shrimp

Cold water shrimp are the most common known subspecies. Their habitat is wide: they are found in the Baltic, Barents, North Seas, off the coast of Greenland and Canada.

At shrimp description such individuals it is worth mentioning that their length is 10-12 cm, and their weight is 5.5-12 grams. Cold-water shrimp are not amenable to artificial reproduction and develop only in their natural habitat.

They feed exclusively on environmentally friendly plankton, which has a positive effect on their quality. The most famous representatives of this subspecies are the northern red shrimp, northern chillim and red comb shrimp.

Pictured is a chilim shrimp

Shrimp, common in the salty waters of the seas and oceans, are called brackish. So, in the Atlantic Ocean live red king prawns, northern white, southern pink, northern pink, serrated and other individuals.

Pictured are prawns

Chilean shrimp can be found on South American coasts. The waters of the Black, Baltic and Mediterranean seas are rich in grassy and sandy shrimps.

Pictured is a grassy shrimp

Freshwater shrimp mainly live in the countries of Southeast and South Asia, Australia, Russia and the post-Soviet countries. The length of such individuals is 10-15 centimeters with a weight of 11 to 18 grams. The most famous species are the troglocar shrimp, Palaemon superbus, Macrobachium rosenbergii.

Shrimp food

basis shrimp nutrition are dying aquatic plants and organic remains. In their natural habitat, they are scavengers. Shrimp will not refuse the pleasure of eating the remains of the dead or even young fish.

Among plants, they prefer to eat those that have fleshy and succulent leaves, for example, ceratopteris. In the process of searching for food, shrimp use the organs of touch and smell. Turning its antennas in different directions, it looks around the area and tries to find prey.

In search of vegetation, certain species of shrimp, living closer to the equator, dig up the soil of the reservoir. They run around its perimeter until they run into food, and then, approaching it at a distance of a centimeter, they sharply attack it. Blind individuals living at the bottom of the Black Sea feed on silt, grinding it with mandibles - well-developed jaws.

For shrimp grown in an aquarium, specially designed compound feeds enriched with nutrients and iodine are produced. It is not recommended to feed them with perishable vegetables.

As food, you can use slightly boiled carrots, cucumber, zucchini, dandelion leaves, clover, cherries, chestnuts, walnuts. A real feast for shrimp is the remains of an aquarium or brethren.

Reproduction and lifespan of shrimp

During puberty, the female shrimp begins the process of forming eggs, resembling a green-yellow mass. When the female is ready to mate, she releases pheromones into the water - substances that have a specific smell.

Having smelled this smell, the males are activated in search of a partner and fertilize her. This process takes less than a minute. Then the shrimp has caviar. The norm for an adult female is laying 20-30 eggs. Embryonic development of larvae lasts from 10 to 30 days, depending on the ambient temperature.

In the process of embryogenesis, the larvae go through 9-12 stages. At this time, changes occur in their structure: at the beginning, the jaws are formed, a little later - the cephalothorax. Most hatched larvae die due to unfavorable conditions or “work” of predators. As a rule, 5-10% of the brood reach maturity. At shrimp farming in the aquarium it is possible to save up to 30% of the offspring.

The larvae lead a sedentary lifestyle and are not able to get food by feeding on the food that they get. The last stage of development in these mollusks is called decapodite. During this period, the larva leads a lifestyle no different from an adult shrimp. On average, the life cycle of a shrimp lasts from 1.5 to 6 years.

Fresh shrimp must be properly frozen. The coloring should be even, the icing should be thin, and the tail should be pressed against the abdomen. White spots on the shell or snow flakes in the package means that the shrimp has been thawed several times. Pay attention to the head of the shrimp, if any. The brown head occurs in pregnant shrimp, their meat is the most delicious and healthy. The green head indicates that the shrimp fed on algae and a special kind of plankton. But the black head speaks of a serious illness, eating such a shrimp is dangerous to health. Black spots on the shell are also unacceptable.

What shrimp most often end up in Russia?

According to , northern red shrimp are most often imported to Russia, followed by northern chilim and red comb shrimp.

By the way, they are red and raw. These shrimp are boiled alive in sea water and immediately frozen after cooking. You can distinguish a boiled shrimp from a raw one by the tail: in a boiled one, it is twisted, and in a raw one, the tail is straight. Market research has shown that northern shrimp are delivered to Russia only boiled-frozen, and such shrimp have a straight tail - a sign that the shrimp was already cooked dead.

An analysis of the frozen shrimp market in Russia highlighted this point: Russian fishermen catch shrimp but ship them to the US, South Korea and Japan, while Russia buys shrimp caught by the Danes and Canadians. This is justified by economic benefits.

Another nuance concerns the size or "caliber" of the shrimp. On the package you can find such numbers - 50/70 (pieces per kilogram), or 70/90 and 90/120. The larger the number, the smaller the shrimp. So, cold-water shrimp are small, and the size of 70/90 is already rare for them. It is better to buy shrimp caliber 90/120, all the others have more ice than meat.

Small shrimp - does not mean bad

The smaller the shrimp, the juicier its meat and the brighter the taste. The data of the shrimp market review should also be taken into account: cold-blooded shrimp are caught in their natural habitat, while warm-blooded shrimp are grown on farms on an industrial scale.

Interesting fact. The so-called "royal" shrimps do not exist in nature. Under this name, all large warm-water shrimp are united, except for tiger shrimp, so named because of the specific color of the shell.

Different countries have their own king prawns - there are white Pacific, Indian, Chinese, Japanese sweet prawns, Atlantic red prawns and even giant freshwater prawns that live in Southeast Asia. But only 20% of the total king prawns are caught in their natural habitat. The remaining 80% comes from farms where shrimp are bred in special ponds.

Where are the "royal prawns" imported to Russia?

According to a study of the frozen shrimp market, large shrimp are brought to Russia from China, India and Bangladesh. Farm shrimp are always larger than wild shrimp, and the manufacturer's packaging must indicate that this is an aquaculture product. They sell frozen king prawns in three types - uncut, with a shell without a head, or completely peeled. By the way, despite the impressive size - 25-30 cm in length, the meat in the king prawn is only 30% of the total weight, the rest is the head.

Tiger prawns - where do they come from?

Mainly farm tiger prawns are supplied to Russia. Black tiger shrimp are brought from India and China, and ordinary ones from Indonesia and Thailand. They differ in color - the common ones have dark stripes on a light shell, while the black ones have the opposite. The size of tiger prawns is even larger than that of king prawns - 30-35 cm, and meat is 50% of the total weight

According to the classification, the Black Sea shrimp belongs to crustaceans that live in the Black, Azov and Mediterranean Seas. It is not only food for fish and other inhabitants of water bodies. For many centuries this delicious delicacy has been preferred by gourmets and seafood lovers, so its production is gaining an industrial scale.

Shrimps (lat. Caridea) are arthropods from the decapod order of the Crangonidae family. They can live safely in both fresh and sea water, due to which they are widely distributed in all water bodies of the world. The depth of their habitat can reach up to 80 m, which they use to hide from enemies. They also know how to quickly dig into the muddy or sandy bottom when they meet a predator.

Its trunk consists of 3 sections: cephalothorax, abdominal and caudal. Almost the entire body is covered with a shell, consisting of chitin and other minerals. The tail plates are divided into segments, at the end of the body they form a tail fan, which helps to swim and move around.

In the front part there are mustache-antennas, which are the organs of touch and smell. Below them are antennules designed to identify the chemical composition of water and food.

Crustaceans have 5 pairs of legs: the first 3 are for self-defense and food capture, the next 5 are for movement. The remaining 2 legs are located under the abdomen and can be used both for swimming and for females to bear eggs. In males, the first pair in the process of evolution turned into an organ for copulation.

The life span of shrimp is 3-5 years. The main diet consists of plankton, the remains of algae. Large specimens of crustaceans eat larvae and worms, small invertebrates and dead fish.

When females reach 3-4 cm in size, they are ready to breed and can lay eggs. After a few days, small planktonic larvae hatch from the masonry. During maturation, they change their shell several times, each subsequent one being slightly larger and stronger than the previous one. And only after going through 5 molts do they reach the post-larvae stage and can switch to a benthic lifestyle.

Varieties

Several species of crustaceans live in the Black Sea, of which 2 belong to shrimps of the genus Palaemon, which are of commercial importance and are eaten.

These include:

Black Sea herbal (Palaemon adspersus);
Black Sea stone (Palaemon elegans).

Palemon slender or stone, which was named for the necessary habitat. These creatures prefer to live among the accumulation of stones in ridges, gorges and in shallow water covered with dense thickets of algae. In secluded places, such inhabitants live in peace, tk. they are well protected from enemies. Here it is possible to find a lot of small plankton, which is their main food.

Stone shrimps can safely live and breed at any salinity of the water, therefore they are also found in the fresher Sea of \u200b\u200bAzov. The size of an adult individual can reach 8 cm with a mass of up to 8 g.

The herbaceous palemon chose algae-grown near-bottom areas and sandy beaches near Anapa as habitat. The color of the shell has light shades, the body is almost transparent, which allows it to live safely in the shallows. The size of such crustaceans is up to 7 cm.

Shrimps of Azov living in the waters of the Kerch Bay and the Sea of Azov are mostly herbaceous, preferring areas heavily overgrown with aquatic vegetation.

How to catch shrimp?

Shellfish are valuable, nutritious and tasty seafood. They contain many vitamins, acids and minerals (calcium, magnesium, sodium, iron, iodine, etc.). The useful substances contained in them allow you to stabilize the hormonal background in the human body and increase its immunity. The disadvantage of shrimp meat is its high cholesterol content.

For their taste, they are valued among gourmets and lovers of fishing. Therefore, catching shrimp is carried out both on an industrial scale and by fishing enthusiasts. The latter prefer not only to eat them, but also sell them to local cafes and restaurants.

Shrimp fishing is most often carried out in the evening or at night. It is best to choose sections in the form of inflows for this, because. in places of narrowing of the reservoir it is convenient to install trawls or traps. Caught crustaceans can be used not only for eating, but can be used as their own bait or as bait when fishing.

Many fishermen fish not only in the coastal zone, but also from a boat. And the most ancient method of shrimp fishing was popular in Belgium and was carried out with the help of specially trained horses that pulled shrimp nets.

habitats

To catch crustaceans in large numbers, you need to know exactly where the shrimp live. Their favorite areas are the bottom layers at a depth of 0.6 to 1.5 m, where there are accumulations of seaweed. If there are low tides and high tides in the chosen place, then the exact time of their onset should be known, because. low tide hours are considered the most convenient for fishing.

Equipment and fishing methods

The main tools and methods of shrimp fishing:

A shrimp net (other names are a landing net or a fight), consisting of a metal circle of large diameter (at least 70 cm) or a rectangle (aluminum, etc.), on which a bag up to 3–4 m long made of fine mesh is fixed, and a long strong handles. A load is attached to the bottom of the net, and sticks are attached to the sides, with which you can pull the net along the bottom, going into the water.
Trawls are made of 2 types (mid-depth and bottom), ropes are tied to them in the amount of 4 pieces, designed to be pulled so that the entire device stretches along the bottom of the reservoir behind the person. At the same time, the fisherman stands waist-deep in water and drags the trawl against the current.
A lantern during fishing with a net or trawl is a bait to attract the attention of aquatic inhabitants, as well as additional illumination.

Home-made traps are widespread for catching shrimp in the Black Sea. To make a shrimp, you will need the following materials:

nylon mesh with cell 14 - a piece of 1.5 × 1.5 m;
galvanized rigid wire - 3-4 m;
thin wire in a plastic braid - 0.6 m;
4 m of nylon thread (string);
float (plastic bottle, etc.) and rope.

First, a piece of mesh is taken and sewn together in the form of a large pipe. Another piece of 15×30 cm is similarly sewn along the length to enter the trap. A piece of thin wire is passed through it to create an entrance in the form of a ring. The edges of the wire must be twisted and fixed.

Then the galvanized wire is threaded into the cells in the form of a spiral, which will hold the trap with rings. After 2-3 turns inside and 1 outside, its ends must be fixed at the first and last rings. Then a circle is obtained, then both edges of the large pipe must be sewn to the wire rings using twine.

In the final, a bait should be tied with a rope between the middle rings. The float is also attached to the middle of the shrimp. Black Sea fishermen often use slightly rotten meat as bait.

The simplest shrimp trap is made from a plastic bottle (floater), a weight, and a plant called a tumbleweed or broom. Several bushes must be tied, a sinker should be tied from below, a float from above. The trap should be lowered to a depth of 1 m overnight. Shrimp en masse climb onto wet plants. In the morning, it remains only to shake them out in a substituted bucket. However, such an old-fashioned way is considered poaching and may be fined.

natural enemies in nature

In the wild, most young shrimp die while still in the larval stage, because they are tasty and healthy food for many underwater inhabitants. They are eaten by demersal fish species, seabirds and even some mammals. Very few survive to adulthood.

Restrictions and prohibitions on catching shrimp

In accordance with the Order of the Ministry of Agriculture, a ban is imposed annually on catching shrimp for the entire summer period. From June 1 to August 31, 1 person is allowed to catch no more than 5 kg of crustaceans. Employees of the fish guard daily carry out raids along the coast of Crimea in order to prevent shrimp fishing.

However, from September 1, the season resumes. The state of shrimp in the Azov and Black Seas, according to experts, is prosperous. Their number is steadily growing, which is of interest to the official fishery and contributes to a rich catch.

Since 2016, these crustaceans have been caught by mining organizations in the Krasnodar Territory and Crimea. The caught catch is delivered to restaurants and other catering establishments. The domestic market for shrimp is in high demand due to its rapid reproduction. According to statistics, the annual shrimp catch in the Black and Azov Seas is more than 1.5 tons.

Shrimps (lat. Caridea) belong to the infraorder of crustaceans of the decapod order. Initially, they lived in the seas and oceans, but now they can be found in salt lakes and even in fresh water. Where exactly do shrimp live, and how do they differ? It turns out that their size and taste qualities directly depend on the places of deployment. The equator is home to a large number of shrimp of various species. The closer to the poles of the Earth, the fewer these species. At the same time, the size of each individual specimen decreases simultaneously with the number.

Warm water shrimp

Warm water shrimp can be easily found, caught and eaten in equatorial countries, for example, in Kenya, Brazil, Ecuador or in the homeland of the most famous pirates in the world today - in Somalia. Here, in the Pacific Ocean, at a water temperature of + 25 ... + 30 ° С, the largest (reaching a size of 30 centimeters) and delicious shrimp on the globe are found - they are also called. For the inhabitants of the Galapagos Islands, the extraction and export of these crustaceans is one of the main sources of income. But the most valued shrimp all over the world are from the waters of Latin America, where they are bred on special farms. They meet the highest quality standards, because the owners and employees are proud of their impeccable reputation and do not want to spoil it for anything.

Shrimp living in cold waters

Smaller shrimps (from 2.5 to 10 centimeters in size) live in the seas and oceans, with an average water temperature of +15°C. If you want to see these crustaceans in their native element or taste dishes prepared from freshly caught shrimp, head to the shores of the Baltic, Barents or North Seas. However, the most delicious of the cold-water shrimp, from the point of view of gourmets, are those that can be found and caught in Greenland and off the coast of Canada.

freshwater shrimp

Freshwater shrimp can be classified as a separate family. They are found in the Amur River basin, live in the cave reservoirs of Transcaucasia. Shrimp living in the fresh waters of the Far East are considered relict, since as a result of geological changes in the land, they were isolated from other related species.

The influence of water temperature and salinity on the life of shrimp

Regardless of where shrimp live, their size and quality of life are subject to fluctuations in ambient temperature. Individuals living in equatorial waters feel best in the temperature range from +25 to +30°C. If the temperature of their habitat drops, reaching +15°C and below, shrimps can die within a short time. However, an increase in temperature to just + 35 ° C is detrimental to crustaceans. For marine shrimp living far from the equator, and freshwater shrimp living in the south of the Far East (in the northernmost habitats), the best conditions are +15°C. If the temperature drops to +10°C, shrimp larvae may die. When the water temperature approaches 0 degrees, adults are not able to survive either. If the stay in insufficiently warm water becomes prolonged, the shrimp begin to feel unwell, grow slowly or do not change in size at all and can survive in such conditions for only 2-2.5 months.

The salinity of water is much less important for shrimp than its temperature. Since all shrimp (even freshwater ones) are originally of marine origin, they are perfectly adapted to fluctuations in the salt content of the water. For example, freshwater shrimp living in the rivers of the Far East survive without damage a not too long increase in water salinity to 16‰. Many species of shrimp during the breeding season are forced to migrate to places where fresh river water mixes with salty sea water, reaching a salt content of 22‰.