Pink salmon: a complete overview of the species, its life cycle, spawning, and fishing

Pink salmon: a complete overview of the species, its life history, spawning, and fishing. Pink salmon (Oncorhynchus gorbuscha) is the most numerous and widespread member of the Pacific salmon family Salmonidae. It is the smallest of all the anadromous salmonids, but also one of the fastest-growing and most prolific. Pink salmon is often called "pink salmon" due to the distinctive color of its flesh, which becomes especially vibrant before spawning. Pink salmon is the mainstay of most canned salmon and natural pink salmon products sold in stores worldwide. It is a key fishery species in the Russian Far East, where it is harvested in enormous quantities.

Pink salmon is a member of the salmon family.

Pink salmon has remained one of the most commercially exploited salmon species for many decades. It leads the world in catch volumes due to its abundance and high availability. The excellent taste, nutritional value of its meat and caviar, combined with its relatively low price, make this fish consistently in demand on the global market.

Origin of the species and description

Pink salmon is a typical member of the salmon family, distinguished by its relatively small size and widespread distribution in the cold waters of oceans and seas. It is an anadromous (migratory) fish that spawns in freshwater and spends most of its life at sea. The name "pink salmon" refers to the distinctive hump on the back of males, which develops during the spawning season.

The most ancient ancestor of modern pink salmon was small in size and resembled the freshwater grayling in its lifestyle. It inhabited the cold waters of North America over 50 million years ago. The next 30 million years of evolution left no discernible traces, but by 24-5 million years ago, all modern salmonids, including pink salmon, were present in these ancient seas.

An interesting fact: all pink salmon larvae are female when they hatch. Before migrating to the sea, half of them change sex to male. This is a natural survival mechanism for the species, as females are more resilient and better able to withstand stress.

Appearance and features

Pink salmon have an elongated body, slightly compressed laterally. The head is conical and small, with small eyes. Males have longer heads than females. The jaws, tongue, palate, and vomer are studded with small teeth. The scales are small and fall off easily.

In the ocean, pink salmon have a blue-green back, silvery sides, and a white belly. Upon returning to rivers, their coloration changes: the body becomes pale gray, the underside yellow or greenish, and dark spots appear. Before spawning, the coloration darkens even further, with the head becoming almost black.

Females retain a relatively normal body shape. Males undergo significant changes:

• the head lengthens
• a row of large teeth appears on the jaws
• an impressive hump grows on the back

Pink salmon, like all salmonids, have an adipose fin between the dorsal and caudal fins. The average adult weighs about 2.5 kg and is about 50 cm long. The largest specimens reach 7 kg and 75 cm in length.

Distinctive features of pink salmon:

• there are no teeth on the tongue
• white mouth
• there are dark oval spots on the back
• the caudal fin is V-shaped

Where does pink salmon live?

Pink salmon are found in large numbers in the northern Pacific Ocean:

• along the Asian coast - from the Bering Strait to Peter the Great Bay
• along the American coast to California

This salmon species lives off the coast of Alaska and in the Arctic Ocean. Pink salmon are found in Kamchatka, the Kuril Islands, Anadyr, the Sea of Okhotsk, Sakhalin, and elsewhere. They are found in the Indigirka River and the lower reaches of the Kolyma River, reaching as far as Verkhne-Kolymsk. They enter the Amur River at low elevations and are not found in the Ussuri River.

The largest pink salmon stocks are found in the North Pacific Ocean, where the American and Asian stocks mix during feeding season. Pink salmon are even found in the waters of the Great Lakes, where a small number of individuals were introduced by accident.

Pink salmon spend only one summer season and winter at sea, and in the middle of their second summer, they migrate to rivers to spawn. Large specimens are the first to leave the seas, and their size gradually decreases. Females arrive at their spawning grounds later than males, and by the end of August, the run ceases—only the fry return to the sea.

Interesting fact: the most impressive ancient salmonid was the extinct "saber-toothed salmon," which weighed over two hundred kilograms, was about three meters long, and had five-centimeter-long fangs. Despite its menacing appearance, it was not a predator, and its fangs were part of its "nuptial plumage."

Pink salmon thrive in cold waters with temperatures ranging from 5–15°C, with temperatures around 10°C being optimal. At temperatures of 25°C and above, the fish die.

On the Putorana Plateau, pink salmon appear sporadically and only in the lower reaches of large rivers flowing into lakes (Khantaika and others). Here, they reach good condition thanks to the icy-clear water and abundant food, but there are no mass aggregations like in Kamchatka or Sakhalin.

What does pink salmon eat?

Adults actively consume large groups of plankton and nekton. In deep waters, their diet consists of juvenile fish and small fish (anchovies, squid). Near the spawning area, pink salmon may completely switch to feeding on the larvae of bottom-dwelling invertebrates and fish. Before spawning, feeding reflexes disappear and the digestive system atrophies, but the grasping reflex remains—so spin fishing can be successful during this period.

Interesting fact: it has been observed that in even-numbered years in Kamchatka and the Amur, pink salmon are smaller than in odd-numbered years. The smallest specimens weigh 1.4–2 kg and are about 40 cm long.

The juveniles feed on a variety of organisms living on the bottom of water bodies, as well as plankton. After reaching the sea, small zooplankton becomes their primary diet. As they grow, they switch to larger zooplankton and small fish.

Despite its small size compared to its relatives, pink salmon grow faster. During its first summer season, a young salmon reaches 20–25 cm.

Interesting fact: in the mid-20th century, there were attempts to acclimatize pink salmon in the rivers of the Murmansk coast, but all of them ended in failure.

Character and lifestyle traits

Pink salmon are not confined to a specific habitat and can travel hundreds of miles from their birthplace. Their entire life is devoted to reproduction. Their lifespan is short—no more than two years—and ends with their first and final spawning. The banks of rivers where pink salmon migrate are often literally littered with the carcasses of dead adults.

As an anadromous migratory fish, pink salmon feed in seas and oceans and enter rivers to spawn. For example, pink salmon begin swimming into the Amur River immediately after the ice melts, and by mid-June, the river surface is teeming with fish. Males outnumber females in the incoming school.

Pink salmon migrations are shorter and more continuous than those of chum salmon. They occur from June to August. The fish do not migrate high up the river, preferring riverbeds with large pebbles and strong currents. After spawning, the spawners die.

All salmon have excellent natural navigation and return to their natal waters with incredible precision. Pink salmon are less fortunate in this regard—their natural radar is poorly developed, so they sometimes drift into unsuitable areas. Sometimes, an entire school will rush into a single river, literally filling it with their bodies, which hinders normal spawning.

Pink salmon spawning

Pink salmon lay their eggs in batches in a pre-prepared nest—a depression on the bottom of the reservoir. They dig the nest with their caudal fin and then bury it with the same fin after spawning and fertilization. A single female produces between 1,000 and 2,500 eggs. Once a batch of eggs is in the nest, the male fertilizes them. There are always more males than females in the riverbed—each batch of eggs must be fertilized by a new male to pass on the genetic code.

The larvae hatch in November–December (rarely until January). While in the seabed, they feed on the reserves of their yolk sac. Only in May, having emerged from the spawning mound, do the fry migrate to the sea. More than half of the fry die during the journey, becoming prey to other fish and birds. During this period, the young have a uniform silvery coloration and are only 3 cm long.

After leaving the river, the fry migrate to the North Pacific Ocean and remain there until the following August. The pink salmon life cycle is two years, so there is a biennial cycle in the species' population. Sexual maturity does not occur until the second year of life.

Natural enemies of pink salmon

In the natural environment, pink salmon have many enemies:

• The eggs are destroyed in huge quantities by other fish (char, grayling)
• seagulls, wild ducks, and predatory fish are not averse to eating the fry
• Adults are included in the diet of beluga whales, seals, and herring sharks
• During spawning, pink salmon are pursued by bears, wolves, wolverines, and eagles

Pink salmon caviar

Pink salmon caviar is one of the most affordable and popular types of red caviar. It's often sold under the generic name "red caviar" unless the manufacturer specifies a specific species. It's a medium-sized Pacific salmon caviar with a distinctive flavor, pleasant texture, and vibrant appearance. While smaller than chum salmon caviar, it's more tender and has a milder, more balanced flavor. Pink salmon caviar is widely used in cooking, on holiday tables, and as an everyday delicacy.

What does pink salmon caviar look like?

Pink salmon eggs are medium-sized—usually 4–6 mm in diameter, rarely up to 6.5 mm. Compared to chum salmon, they are noticeably smaller, but larger than sockeye or coho salmon eggs. They are regular in shape, almost perfectly spherical. The color is a rich orange-red, often with a slight amber or coral tint. High-quality caviar has a bright and uniform color, free of turbidity and grayish inclusions.

The shell of the eggs is thin and elastic, easily bursting with gentle pressure, releasing the juice. When properly salted, the caviar doesn't clump together; the eggs separate easily and retain their elasticity. If the caviar is oversalted, the shell becomes too hard and brittle; if it's undersalted, it quickly bursts and runs, turning into mush.

The taste and texture of pink salmon caviar

The flavor of pink salmon caviar is soft and delicate, with a slightly sweet note and a subtle bitterness. The aftertaste is pleasant and buttery, without a harsh saltiness or metallic aftertaste. Many believe this is the essence of the "classic" flavor of red caviar—not too bright and aggressive, like chum salmon, and not too subtle, like coho salmon.

The texture of the eggs is delicate yet firm. They burst in the mouth with a distinctive pop, leaving a sensation of freshness and a slight oiliness. This makes pink salmon caviar especially delicious eaten on its own—on bread and butter, in salads, on pancakes, or simply by the spoonful.

Nutritional value and composition of pink salmon caviar

100 grams of pink salmon caviar contains approximately:

• Caloric content: 230–250 kcal
• Proteins - 29–32 g
• Fats - 12-17 g (mostly polyunsaturated Omega-3)
• Carbohydrates - 0-1 g
• Water - about 50-55 g

Pink salmon caviar is rich in vitamins:

• Vitamin A - 250-400 mcg
• Vitamin D — 5–12 μg
• Vitamin E — 3–6 mg
• B vitamins (B1, B2, B6, B12, niacin, folic acid)
• Vitamin C - in small amounts

Mineral composition:

• Phosphorus — 400–550 mg
• Potassium - 300-450 mg
• Magnesium - 30-50 mg
• Selenium — 30–60 mcg
• Iron - 2-4 mg
• Zinc — 1–2 mg
• Iodine - 10-30 mcg

The high content of Omega-3, vitamin D, selenium and complete protein makes pink salmon caviar one of the most beneficial animal products.

The benefits of pink salmon caviar

Regular moderate consumption of pink salmon caviar (100–150 g 1–2 times a week) brings significant benefits to the body:

• strengthens the immune system
• improves the functioning of the heart and blood vessels
• reduces the level of "bad" cholesterol
• supports brain and nervous system health
• improves the condition of skin, hair and nails
• helps with anemia
• accelerates recovery after physical exertion and illness
• has a positive effect on vision and the thyroid gland
• helps normalize blood pressure
• has an anti-inflammatory effect

Pink salmon caviar is especially beneficial for children, pregnant women (in moderation), people after surgery and athletes.

Potential harm and contraindications of pink salmon caviar

Despite all the benefits, pink salmon caviar is a product that should not be consumed without control.

Main limitations:

• High salt content - not recommended for hypertension, edema, kidney disease
• High in calories and fat - use with caution if you are obese
• Accumulation of heavy metals (mercury, lead) - should not be overused by pregnant women and children under 3 years of age
• Allergy to fish and seafood - complete exclusion
• Gout and kidney stones - due to high purine content

How to distinguish pink salmon caviar from other types

Pink salmon caviar is easily recognized by several characteristics:

• the size of the eggs is 4–6 mm (noticeably smaller than those of chum salmon, but larger than those of sockeye and coho salmon)
• color - bright orange, often with a slight amber tint (chum salmon has a more saturated red, sockeye salmon has a dark burgundy, and coho salmon has a lighter and paler color)
• the shell is thin and elastic, it bursts easily and with a characteristic click
• taste - soft, delicate, sweetish, without strong bitterness (chum salmon is brighter and more bitter, sockeye salmon is sweetish-bitter, coho salmon is very tender and subtle)

Population and status of the species

Pink salmon are one of the most abundant Pacific salmon species. Their population is stable and even growing in some regions due to their high fecundity and rapid growth. However, in recent years, some areas have seen population declines due to overfishing, river pollution, and climate change.

Conclusion

Pink salmon are a symbol of the salmon runs and the abundance of Far Eastern rivers. Unlike the freshwater giants of the Putorana Plateau— taimen, lenok, and char—which reach remarkable sizes in crystal-clear rivers and lakes thanks to the pristine environment and abundance of natural food, pink salmon rule the seas and rivers of the Far East, where their millions of schools, powerful runs, and role in the ecosystem remain unrivaled.