Trout in the context of River Alre

Salmon (/ˈsæmən/; pl.: salmon) are any of several commercially important species of euryhaline ray-finned fish from the genera Salmo and Oncorhynchus of the family Salmonidae, native to tributaries of the North Atlantic (Salmo) and North Pacific (Oncorhynchus) basins. Salmon is a colloquial or common name used for fish in this group, but is not a scientific name. Other closely related fish in the same family include trout, char, grayling, whitefish, lenok and taimen, all coldwater fish of the subarctic and cooler temperate regions with some sporadic endorheic populations in Central Asia.

Salmon are typically anadromous: they hatch in the shallow gravel beds of freshwater headstreams and spend their juvenile years in rivers, lakes and freshwater wetlands, migrate to the ocean as adults and live like sea fish, then return to their freshwater birthplace to reproduce. However, populations of several species are restricted to fresh waters (i.e. landlocked) throughout their lives. Folklore has it that the fish return to the exact stream where they themselves hatched to spawn, and tracking studies have shown this to be mostly true. A portion of a returning salmon run may stray and spawn in different freshwater systems; the percent of straying depends on the species of salmon. Homing behavior has been shown to depend on olfactory memory.

Overfishing is the removal of aquatic animals — primarily fish — from a body of water at a rate greater than that the species can replenish its population naturally (i.e. the overexploitation of the fishery's existing fish stocks), resulting in the species becoming increasingly underpopulated in that area. Excessive fishing practices can occur in water bodies of any sizes, from ponds, wetlands, rivers, lakes to seas and oceans, and can result in resource depletion, reduced biological growth rates and low biomass levels. Sustained overfishing, especially industrial-scale commercial fishing, can lead to critical depensation, where the fish population is no longer able to sustain itself, resulting in extirpation or even extinction of species. Some forms of overfishing, such as the overfishing of sharks, has led to the upset of entire marine ecosystems. Types of overfishing include growth overfishing, recruitment overfishing, and ecosystem overfishing. Overfishing not only causes negative impacts on biodiversity and ecosystem functioning, but also reduces fish production, which subsequently leads to negative social and economic consequences.

The ability of a fishery to recover from overfishing depends on whether its overall carrying capacity and the variety of ecological conditions are suitable for the recovery. Dramatic changes in species composition can result in an ecosystem shift, where other equilibrium energy flows involve species compositions different from those that had been present before the depletion of the original fish stock. For example, once trout have been overfished, carp might exploit the change in competitive equilibria and take over in a way that makes it impossible for the trout to re-establish a breeding population.

Baba (Macedonian: Баба; or Baba Mountain, Macedonian: Баба Планина, romanized: Baba Planina), also known by the name of its highest peak, Pelister (Macedonian: Пелистер), is a mountain in North Macedonia. The Pelister peak (2601 metres, or 8533 feet) overlooks the city of Bitola. Baba is the third highest mountain in North Macedonia. Other peaks besides Pelister are Dva Groba (2514 metres), Veternica (2420 metres), Musa (2350 metres), Ržana (2334 meters), Široka (2218 metres), Kozji Kamen (2199 metres), Griva (2198 metres) and Golema Čuka (2188 metres) in North Macedonia, and Belavoda (2.179 meters), Kirko. The Baba massif splits up the rivers in the region, so that they either flow towards the Adriatic Sea.

Pelister National Park's flora include the five-needle pine molika (Pinus peuce) - a unique species of tertiary age being present on only a few mountains in the Balkan Peninsula. Fauna in the area include: bears, roe deer, wolves, chamois, deer, wild boars, rabbits, several species of eagles, partridges, redbilled jackdaws, and the endemic Macedonian Pelagonia trout. In a comprehensive article published in 2002, Melovski and Godes reported that there are three large carnivores in North Macedonia which can be found in Baba and surrounds, the brown bear, the wolf and the lynx. Actual numbers at that time were difficult to estimate given that most reports came from non-scientific sources (surveys, hunters and anecdotal reports), however in 2002, it was estimated there were approximately 30 bears in N.P. Pelister and Galičica N.P hosting only 3-4. A larger number could apparently be found in the N.P Mavrovo. The numbers however may be significantly larger in today's climate given the protected status of bears in North Macedonia. In terms of wolves, there was an estimated total of 1200 wolves in the entire country of North Macedonia, with an estimated 54 lynx when the article was written.

The Amur River (Russian: река Амур) or Heilong River (simplified Chinese: 黑龙江; traditional Chinese: 黑龍江) is a perennial river in Northeast Asia, forming the natural border between the Russian Far East and Northeast China (historically the Outer and Inner Manchuria). The Amur proper is 2,824 km (1,755 mi) long, and has a drainage basin of 1,855,000 km (716,000 sq mi). If including its main stem tributary, the Argun, the Amur is 4,444 km (2,761 mi) long, making it the world's tenth longest river.

The Amur is an important river for the aquatic fauna of Northeast Asia. The river basin is home to a variety of large predatory fish such as northern snakehead, Amur pike, taimen, Amur catfish, predatory carp and yellowcheek, as well as several species of trout and anadromous salmonids. The largest fish species in the Amur is the kaluga, a sturgeon that is one of the largest freshwater fish in the world, attaining a length as great as 5.6 m (18 ft). The Amur is also home to the northernmost populations of the Amur softshell turtle and Indian lotus.

Salmonidae (/sælˈmɒnɪdiː/, lit. 'salmon-like') is a family of ray-finned fish, the only extant member of the suborder Salmonoidei, consisting of 11 extant genera and over 200 species collectively known as "salmonids" or "salmonoids". The family includes salmon (both Atlantic and Pacific species), trout (both ocean-going and landlocked), char, graylings, freshwater whitefishes, taimens and lenoks, all coldwater mid-level predatory fish that inhabit the subarctic and cool temperate waters of the Northern Hemisphere. The Atlantic salmon (Salmo salar), whose Latin name became that of its genus Salmo, is also the eponym of the family and order names.

Salmonids have a relatively primitive appearance among teleost fish, with the pelvic fins being placed far back, and an adipose fin towards the rear of the back. They have slender bodies with rounded scales and forked tail fins, and their mouths contain a single row of sharp teeth. Although the smallest salmonid species is just 13 cm (5.1 in) long for adults, most salmonids are much larger, with the largest reaching 2 m (6 ft 7 in).

Salvelinus is a genus of salmonid fish often called char or charr; some species are called "trout". Salvelinus is a member of the subfamily Salmoninae within the family Salmonidae. The genus has a northern circumpolar distribution, and most of its members are typically cold-water fish that primarily inhabit fresh waters. Many species also migrate to the sea.

Most char may be identified by light-cream, pink, or red spots over a darker body. Scales tend to be small, with 115–200 along the lateral line. The pectoral, pelvic, anal, and the lower aspect of caudal fins are trimmed in snow white or cream leading edges.

The term coldwater fish can have different meanings in different contexts.

• In the context of fishkeeping, it refers to ornamental fish species that tolerate the temperatures of a typical indoor aquarium well and do not require a heater to remain active, as opposed to tropical fish whom need a heater to survive in the room temperatures of temperate climates;
• In the context of ecology and fishing, it refers to fish species that prefer to inhabit waterbodies or depth zones with much lower temperatures than the average temperate water. Salmonids (e.g. salmon, trout, char and graylings) are a classic example of such types of fish.

Lake Kezenoy-am (Lake Goluboye, Russian: Кезенойам, Голубое; Chechen: Къоьзана Iaм, romanized: Q̇özana Jam) is the deepest lake in the Caucasus Mountains, in the Russian Federation, mostly in Chechnya but partly in Dagestan. It goes through Andiyskiy Khrebet (Andian Ridge). It is situated at an altitude of 1,870 m (6,140 ft) above sea level and covers an area of 2.4 km (0.93 sq mi). The maximum depth of the lake is 74 m (243 ft). In winter the surface of the lake freezes and in summer the water temperature is around 5 °C (41 °F). The lake water has a year-round supply of oxygen in which plankton survive. Salmo ezenami, a rare species of trout, are native only to the lake; however, their population is threatened with extinction due to the introduction of European chubs (Squalius cephalus) which consume their fry.

Caviar or caviare is a food consisting of salt-cured roe of the family Acipenseridae. Caviar is considered a delicacy and is eaten as a garnish or spread. Traditionally, the term caviar refers only to roe from wild sturgeon in the Caspian Sea and Black Sea (beluga, ossetra and sevruga caviars). The term caviar can also describe the roe of other species of sturgeon or other fish such as paddlefish, salmon, steelhead, trout, lumpfish, whitefish, or carp.

The roe can be fresh (non-pasteurized) or pasteurized, which reduces its culinary and economic value.

In fishing, casting is the act of the actively throwing a fishing tackle or rig into the water in order to deploy it. In recreational fishing, the term most commonly describes an angler launching a baited hook (or a lure) as well as other attached terminal tackles (e.g. float or sinker) out far over the water, typically by slinging a line manipulated by a long, elastic rod. The term is also used for scattering groundbaits/chums, manually throwing a hook when handlining, and setting out a net during artisanal fishing.

The basic casting technique in angling is to quickly flick/swing the rod forward towards the water, with the lagging inertia of the tackles bending the rod backward (i.e. "loading" the rod), and then use the "springing" (elastic rebound) of the rod to "hurl" and rapidly sling the line forward, which in turn will launch out the hook and bait. There are several methods anglers can use to attempt to cast farther, the most prominent of which is the shifting of body weight towards the front foot in kinematic synchrony to the forward swinging of the rod. That, combined with using a longer rod, stopping the rod swing at 45 degrees, and using correctly weighted and more aerodynamic terminal tackles, will help anglers cast farther. There are also variation techniques the anglers can use to cast the tackles more accurately to an exact location on the water or to get past potential obstacles.

Tenkara fishing (Japanese: テンカラ釣り, literally: "fishing from heaven", "sky fishing", or "empty sky fishing" as ten = "sky" and kara = "empty") is a type of simple rod angling traditionally practiced in Japan. Primarily used for mountain stream trout fishing, tenkara is still a fairly rare method even among freshwater anglers in Japan, and was largely unknown outside Japan until 2009, when the company Tenkara USA, founded by Daniel Galhardo, introduced and popularized tenkara outside Japan.

Although there are similarities between tenkara and traditional Western-style fly fishing, the two techniques developed independently of each other, with tenkara being purely Japanese in origin. In addition, fly fishing uses specialized rod, reel and line and a type of ultralight fishing lure known as artificial fly, while traditional tenkara is reel-less and mostly uses real insects as bait (although modern tenkara tends to use so-called Japanese Flies).

A quiver tip is a flexible extension to a fishing rod which is designed to vibrate, or quiver, when a fish takes the bait. The main characteristic of its design is its sensitivity. It is a popular and very effective method of bite indication both on still and running water, and is used far more often in bottom fishing. It is not used in game fishing (i.e. for salmon, trout and sea trout) and is seldom, if ever, used when fishing for very large coarse fish (e.g. carp or pike). In essence, the angler watches the tip of the fishing rod to detect bites as opposed to, say, a float or an electronic bite alarm.

Fly fishing is an angling technique that uses an ultra-lightweight lure called an artificial fly, which typically mimics small invertebrates such as flying and aquatic insects to attract and catch fish. Because the mass of the fly lure is insufficient to overcome air resistance, it cannot be launched far using conventional gears and techniques, so specialized tackles are used instead and the casting techniques are significantly different from other forms of angling. It is also very common for the angler to wear waders, carry a hand net, and stand in the water when fishing.

Fly fishing primarily targets predatory fish that have a significant amount of very small-sized prey in their diet, and can be done in fresh or saltwater. North Americans usually distinguish freshwater fishing between cold-water species (trout, salmon) and warm-water species (notably black bass). In Britain, where natural water temperatures vary less, the distinction is between game fishing for trout and salmon versus coarse fishing for other species. Techniques for fly fishing differ with habitat (lakes and ponds, small streams, large rivers, bays and estuaries, and open ocean.)

The Jadro is a watercourse in Dalmatia, Croatia, that discharges into the Adriatic Sea. The upper reaches of the Jadro River, as well as its source, Jadro Spring, are protected as an ichthyological nature reserve, partly due to the presence of an endemic species of soft-mouthed trout. The headwaters of the Jadro River were the original water supply for the ancient city comprised by Diocletian's Palace (now an area within the present day city of Split). Contemporary studies indicate favourable water quality levels of the river near the headwaters at Jadro Spring.

The Jadro flows through the town of Solin and has a length of approximately four kilometres' moreover, the river provides water to the cities of Split, Kaštela and Trogir as well as of municipalities Podstrana, Klis, Seget and Okrug. Incompliances with the regulations related to water for consumption occasionally appear due to turbidity caused by abundant precipitation.

Micropterus is a genus of North American freshwater fish collectively known as the black bass, which belong to the sunfish family Centrarchidae of order Centrarchiformes. They are sometimes erroneously called "black trout", but the name trout more correctly refers to certain potamodromous members of the family Salmonidae (order Salmoniformes).

Micropterus are widely distributed east of the Rocky Mountains, from the Hudson Bay basin in Canada to northeastern Mexico. Several species, notably the largemouth and smallmouth bass, have been very widely introduced throughout the world, and are now considered cosmopolitan. All black bass species are highly sought-after game fish and well known as strong fighters when hooked, and bass fishing is an extremely popular outdoor sport throughout their native range. Their meat is quite edible and firm, although they are not regarded as commercial food fish.

The bluegill (Lepomis macrochirus), sometimes referred to as "bream", "brim", "sunny", or, in Texas, "copper nose", is a species of North American freshwater fish, native to and commonly found in streams, rivers, lakes, ponds and wetlands east of the Rocky Mountains. It is the type species of the genus Lepomis (true sunfish), from the family Centrarchidae (sunfishes, crappies and black basses) in the order Centrarchiformes.

Bluegills can grow up to 16 in (41 cm) long and about 4+1⁄2 lb (2.0 kg). While their color can vary from population to population, they typically have a very distinctive coloring, with deep blue and purple on the face and gill cover, dark olive-colored bands down the side, and a fiery orange to yellow belly. They are omnivorous and will consume anything they can fit in their mouth, but mostly feed on small aquatic insects and baitfishes. The fish are important prey for bass, other larger sunfish, northern pike and muskellunge, walleye, trout, herons, kingfishers, snapping turtles and otters, and play a key role within the food chain of its freshwater ecosystem.