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46-630: The tench or doctor fish ( Tinca tinca ) is a fresh- and brackish-water fish of the order Cypriniformes found throughout Eurasia from Western Europe including the British Isles east into Asia as far as the Ob and Yenisei Rivers . It is also found in Lake Baikal . It normally inhabits slow-moving freshwater habitats, particularly lakes and lowland rivers. The tench was first formally described in as Cyprinus tinca by Carl Linnaeus in 1758 in

92-539: A desert climate often face physical water scarcity. Central Asia , West Asia , and North Africa are examples of arid areas. Economic water scarcity results from a lack of investment in infrastructure or technology to draw water from rivers, aquifers , or other water sources. It also results from weak human capacity to meet water demand. Many people in Sub-Saharan Africa are living with economic water scarcity. An important concern for hydrological ecosystems

138-526: A collection of 17 interlinked global goals designed to be a "blueprint to achieve a better and more sustainable future for all". Targets on fresh water conservation are included in SDG 6 (Clean water and sanitation) and SDG 15 (Life on land). For example, Target 6.4 is formulated as "By 2030, substantially increase water-use efficiency across all sectors and ensure sustainable withdrawals and supply of freshwater to address water scarcity and substantially reduce

184-637: A day ticket basis. In the UK, these can range in price. They are usually paid on the bank with a representative of the venue collecting the fees from anglers from the peg (fishing spot) at some time during the day, or prior to commencing fishing. In some cases, season tickets can be purchased. Some lakes and river stretches are operated by angling clubs which charge annual membership fees. Application forms can be available from local tackle shops or angling club websites. Fishing venues can be operated by syndicates, usually by invitation. They can sometimes be joined by contacting

230-402: A drinking water supply it remains vital to protect due to its ability to carry contaminants and pollutants from the land into lakes and rivers, which constitute a significant percentage of other people's freshwater supply. It is almost ubiquitous underground, residing in the spaces between particles of rock and soil or within crevices and cracks in rock, typically within 100 m (330 ft) of

276-566: A handle on the reel. However, the use of "poles" is also widespread. Here, the line is fixed to the very tip of the rod, with no reel used: in order to retrieve the line, the pole itself is taken apart until the line can be swung to hand. Poles are often very long in order to increase the angler's range—up to 52 feet (16 m). The main techniques used are float fishing , bottom fishing (legering) and lure fishing . Fly fishing techniques may also be used for certain species, such as grayling or chub . For float and leger fishing, groundbait

322-428: A larger salt content. Freshwater habitats can be classified by different factors, including temperature, light penetration, nutrients, and vegetation. There are three basic types of freshwater ecosystems: Lentic (slow moving water, including pools , ponds , and lakes ), lotic (faster moving water, for example streams and rivers ) and wetlands (areas where the soil is saturated or inundated for at least part of

368-402: A popular choice for many game anglers due their ability to mimic prey items, (such as small invertebrates), on the surface and top layers of the water, enticing the fish into feeding. Both floating and sinking flies and lures can be used to fish either on the surface or in the upper layers of the water. Usually, in the summer months, a spinner or fly manoeuvre across the surface will bring about

414-413: A senior member of the syndicate. The most common types of tackle is the rod and reel, the rod being typically between 8 and 13 feet (2.4–4.0 m) long, and manufactured of tubular carbon fibres or splits of Tonkin bamboo. A reel is then attached near the base of the rod to hold a long length of line, which is run to the tip of the rod through eyelets. Once cast out, the line can be retrieved by winding

460-519: A single factor. Groundwater showed greater resilience to climate change than expected, and areas with an increasing threshold between 0.34 and 0.39 aridity index exhibited significant sensitivity to climate change. Land-use could affect infiltration and runoff processes. The years of most recharge coincided with the most precipitation anomalies, such as during El Niño and La Niña events. Three precipitation-recharge sensitivities were distinguished: in super arid areas with more than 0.67 aridity index, there

506-529: A take from a fish due to the tendency of fish to move into the warmest part of the water, the surface and first layer—about 18 inches (46 cm)—of water below. When fishing a river for coarse fish species, such as chub, barbel, roach, dace and bream, the favourite hook baits tend to be maggot (white, red, and bronze), caster (maggot chrysalis), worm, cheese, pellets (halibut, trout, and carp), boilies (round boiled baits typically made with fish meal, milk, and soya ) and luncheon meat . Loose feed can be any of

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552-438: A thick skin, making it as slippery as an eel . Folklore has it that this slime cured any sick fish that rubbed against it, and from this belief arose the name doctor fish . An artificially bred variety of tench called the golden tench is a popular ornamental fish for ponds. This form varies in colour from pale gold through to dark red, and some fish have black or red spots on the flanks and fins. Though somewhat similar to

598-408: Is absent altogether from fast-flowing streams. It tolerates water with a low oxygen concentration, being found in waters where even the carp cannot survive. Tench feed mostly at night with a preference for animals, such as chironomids , on the bottom of eutrophic waters and snails and pea clams in well-vegetated waters. Breeding takes place in shallow water usually among aquatic plants where

644-693: Is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids . The term excludes seawater and brackish water , but it does include non-salty mineral-rich waters , such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets , ice caps , glaciers , snowfields and icebergs , natural precipitations such as rainfall , snowfall , hail / sleet and graupel , and surface runoffs that form inland bodies of water such as wetlands , ponds , lakes , rivers , streams , as well as groundwater contained in aquifers , subterranean rivers and lakes . Water

690-449: Is consumed through human activities than is naturally restored, this may result in reduced fresh water availability (or water scarcity ) from surface and underground sources and can cause serious damage to surrounding and associated environments. Water pollution also reduces the availability of fresh water. Where available water resources are scarce, humans have developed technologies like desalination and wastewater recycling to stretch

736-416: Is critical to the survival of all living organisms . Many organisms can thrive on salt water, but the great majority of vascular plants and most insects , amphibians , reptiles , mammals and birds need fresh water to survive. Fresh water is the water resource that is of the most and immediate use to humans. Fresh water is not always potable water , that is, water safe to drink by humans . Much of

782-452: Is extracted for human consumption. Agriculture uses roughly two thirds of all fresh water extracted from the environment. Fresh water is a renewable and variable, but finite natural resource . Fresh water is replenished through the process of the natural water cycle , in which water from seas, lakes, forests, land, rivers and reservoirs evaporates, forms clouds , and returns inland as precipitation. Locally, however, if more fresh water

828-479: Is particularly crucial in Africa, where water resources are often scarce and climate change poses significant challenges. Saline water in oceans , seas and saline groundwater make up about 97% of all the water on Earth . Only 2.5–2.75% is fresh water, including 1.75–2% frozen in glaciers , ice and snow, 0.5–0.75% as fresh groundwater. The water table is the level below which all spaces are filled with water, while

874-527: Is rather narrow and provided at each corner with a very small barbel . Maximum size is 70 cm (28 in), though most specimens are much smaller. A record fish caught in 2001 in England had a weight of 15 lb 3.4 oz (6.899 kg). The eyes are small and red-orange in colour. Females can reach weights of around 7 kg (15 lb), although 4 kg (8.8 lb) is considered large. Males rarely reach over 3 kg (6.5 lb). Sexual dimorphism

920-826: Is securing minimum streamflow , especially preserving and restoring instream water allocations . Fresh water is an important natural resource necessary for the survival of all ecosystems . Water pollution (or aquatic pollution) is the contamination of water bodies , with a negative impact on their uses. It is usually a result of human activities. Water bodies include lakes , rivers , oceans , aquifers , reservoirs and groundwater . Water pollution results when contaminants mix with these water bodies. Contaminants can come from one of four main sources. These are sewage discharges, industrial activities, agricultural activities, and urban runoff including stormwater . Water pollution may affect either surface water or groundwater . This form of pollution can lead to many problems. One

966-404: Is strong, males can be recognised by having larger, more curved pelvic fins extending beyond the anus and noticeable muscles around the base of these fins generally absent in females. Males also possess a very thick and flattened outer ray to the ventral fins. Adult females may have a more convex ventral profile when compared with males. The tench has very small scales, which are deeply embedded in

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1012-420: Is the degradation of aquatic ecosystems . Another is spreading water-borne diseases when people use polluted water for drinking or irrigation . Water pollution also reduces the ecosystem services such as drinking water provided by the water resource . Uses of water include agricultural , industrial , household , recreational and environmental activities. The Sustainable Development Goals are

1058-473: Is the technique usually used for freshwater game fishing, while other angling techniques are usually used for coarse fishing. The sport of coarse fishing and its techniques are particularly popular in the United Kingdom and mainland Europe , as well as in some former British Commonwealth countries and among British expatriates . The distinction between coarse fish and game fish, terms that developed in

1104-488: The 10th edition of Systema Naturae with its type locality given as "European lakes". In 1764 François Alexandre Pierre de Garsault proposed the new monospecific genus Tinca , with Cyprinus tinca as the type species by absolute tautonymy . The 5th edition of Fishes of the World classified Tinca in the subfamily Tincinae , alongside the genus Tanichthys , while other authorities classified both these genera in

1150-531: The Amazon River . The atmosphere contains 0.04% water. In areas with no fresh water on the ground surface, fresh water derived from precipitation may, because of its lower density, overlie saline ground water in lenses or layers. Most of the world's fresh water is frozen in ice sheets . Many areas have very little fresh water, such as deserts . Water is a critical issue for the survival of all living organisms. Some can use salt water but many organisms including

1196-657: The Green Sahara periods) and are not appreciably replenished under current climatic conditions - at least compared to drawdown, these aquifers form essentially non-renewable resources comparable to peat or lignite, which are also continuously formed in the current era but orders of magnitude slower than they are mined. Fresh water can be defined as water with less than 500 parts per million (ppm) of dissolved salts . Other sources give higher upper salinity limits for fresh water, e.g. 1,000 ppm or 3,000 ppm. Fresh water habitats are classified as either lentic systems , which are

1242-508: The earth 's fresh water (on the surface and groundwater) is to a substantial degree unsuitable for human consumption without treatment . Fresh water can easily become polluted by human activities or due to naturally occurring processes, such as erosion. Fresh water makes up less than 3% of the world's water resources, and just 1% of that is readily available. About 70% of the world's freshwater reserves are frozen in Antarctica . Just 3% of it

1288-424: The goldfish , because these fish have such small scales, their quality is rather different. Tench are edible, working well in recipes that would otherwise call for carp, but are not commonly consumed. They are shoaling fish that are popular quarries for coarse angling in rivers, lakes and canals. Tench, particularly golden tench, are also kept as ornamental fish in ponds as they are bottom feeders that help to keep

1334-659: The United Kingdom in the early 19th century, has no taxonomic basis Before that time, recreational fishing was a sport of the gentry , who angled for salmon and trout and called them "game fish". There was a view that other fish did not make as good eating, and they were disdained as coarse fish. Coarse fish have scales that are generally larger than the scales of game fish, and tend to inhabit warmer and stiller waters. When fishing on rivers for game fish (i.e., brown, rainbow, brook and sea trout, salmon and in some cases grayling), artificial flies, small spinners and lures are

1380-570: The above baits with a particle bait, sometimes in the form of hemp seed or a manufactured fishmeal ground bait. For most species, hook baits will work. When targeting more specific species, such as specimen carps, baits such as boilies, large pellets, large bunches of maggots , floating baits, large lungworm , tiger nuts, and meat chunks from cat food can work well. Micro pellets softened along with ground bait can be fed alongside all hook baits. Predatory fish such as pike, zander, perch, and eels can be caught using either dead or live bait, typically in

1426-494: The area above this level, where spaces in the rock and soil contain both air and water, is known as the unsaturated zone. The water in this unsaturated zone is referred to as soil moisture. Below the water table, the entire region is known as the saturated zone, and the water in this zone is called groundwater. Groundwater plays a crucial role as the primary source of water for various purposes including drinking, washing, farming, and manufacturing, and even when not directly used as

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1472-421: The available supply further. However, given the high cost (both capital and running costs) and - especially for desalination - energy requirements, those remain mostly niche applications. A non-sustainable alternative is using so-called " fossil water " from underground aquifers . As some of those aquifers formed hundreds of thousands or even millions of years ago when local climates were wetter (e.g. from one of

1518-669: The form of a small fish such as a live roach. However, it is worth noting that some fishing venues prohibit the use of live bait. Spinning, the use of an artificial lure, is also used for predators. For all anglers in England and Wales, anyone aged 17 and over must purchase a valid rod licence before fishing. Children under 13 do not need a licence, and children aged 13–16 must get a free junior licence. This will enable anglers to legally fish in England and Wales for non migratory trout and coarse fish. A single rod licence will enable an angler to fish with up to three rods at any one time. Most commercial fisheries and some rivers are operated on

1564-527: The freshwater flow to be measurably contaminated both by insoluble solids but also by the soluble components of those soils. Significant quantities of iron may be transported in this way including the well-documented transfer of iron-rich rainfall falling in Brazil derived from sand-storms in the Sahara in north Africa . In Africa, it was revealed that groundwater controls are complex and do not correspond directly to

1610-547: The great majority of higher plants and most mammals must have access to fresh water to live. Some terrestrial mammals, especially desert rodents , appear to survive without drinking, but they do generate water through the metabolism of cereal seeds, and they also have mechanisms to conserve water to the maximum degree. Freshwater ecosystems are a subset of Earth's aquatic ecosystems . They include lakes , ponds , rivers , streams , springs , bogs , and wetlands . They can be contrasted with marine ecosystems , which have

1656-399: The number of people suffering from water scarcity ." Another target, Target 15.1, is: "By 2020, ensure the conservation, restoration and sustainable use of terrestrial and inland freshwater ecosystems and their services, in particular forests, wetlands , mountains and drylands , in line with obligations under international agreements." Subnotes Coarse angling Fly fishing

1702-413: The others as well. Water scarcity (closely related to water stress or water crisis) is the lack of fresh water resources to meet the standard water demand. There are two types of water scarcity. One is physical. The other is economic water scarcity . Physical water scarcity is where there is not enough water to meet all demands. This includes water needed for ecosystems to function. Regions with

1748-421: The sea if windy conditions have lifted drops of seawater into the rain-bearing clouds. This can give rise to elevated concentrations of sodium , chloride , magnesium and sulfate as well as many other compounds in smaller concentrations. In desert areas, or areas with impoverished or dusty soils, rain-bearing winds can pick up sand and dust and this can be deposited elsewhere in precipitation and causing

1794-410: The sticky green eggs can be deposited. Spawning usually occurs in summer, and as many as 300,000 eggs may be produced. Growth is rapid, and fish may reach a weight of 0.11 kg (0.25 lb) within the first year. Tench have a stocky, carp-like shape and olive-green skin, darker above and almost golden below. The tail fin is square in shape. The other fins are distinctly rounded in shape. The mouth

1840-420: The stillwaters including ponds , lakes, swamps and mires ; lotic which are running-water systems; or groundwaters which flow in rocks and aquifers . There is, in addition, a zone which bridges between groundwater and lotic systems, which is the hyporheic zone , which underlies many larger rivers and can contain substantially more water than is seen in the open channel. It may also be in direct contact with

1886-401: The subfamily Leuciscinae with other Eurasian minnows, but more recent phylogenetic studies have supported it belonging to its own family Tincidae . The Tincidae was first proposed as a name in 1878 by David Starr Jordan . The tench is most often found in still waters with a clay or muddy substrate and abundant vegetation. This species is rare in clear waters across stony substrate, and

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1932-583: The surface, and soil moisture, and less than 0.01% of it as surface water in lakes , swamps and rivers . Freshwater lakes contain about 87% of this fresh surface water, including 29% in the African Great Lakes , 22% in Lake Baikal in Russia, 21% in the North American Great Lakes , and 14% in other lakes. Swamps have most of the balance with only a small amount in rivers, most notably

1978-469: The time). Freshwater ecosystems contain 41% of the world's known fish species. The increase in the world population and the increase in per capita water use puts increasing strains on the finite resources availability of clean fresh water. The response by freshwater ecosystems to a changing climate can be described in terms of three interrelated components: water quality, water quantity or volume, and water timing. A change in one often leads to shifts in

2024-657: The underlying underground water. The original source of almost all fresh water is precipitation from the atmosphere , in the form of mist , rain and snow . Fresh water falling as mist, rain or snow contains materials dissolved from the atmosphere and material from the sea and land over which the rain bearing clouds have traveled. The precipitation leads eventually to the formation of water bodies that humans can use as sources of freshwater: ponds , lakes , rainfall , rivers , streams , and groundwater contained in underground aquifers . In coastal areas fresh water may contain significant concentrations of salts derived from

2070-452: The waterways clean and healthy. Large tench may be found in gravel pits or deep, slow-moving waters with a clayey or silty bottom and copious aquatic vegetation. The best methods and bait to catch tench are float fishing and ledgering with a swim feeder using maggots, sweetcorn, pellets, bread, and worms. Fish over 1 kg (2 lb) in weight are very strong fighters when caught on a rod. Freshwater Fresh water or freshwater

2116-461: Was constant recharge with little variation with precipitation; in most sites (arid, semi-arid, humid), annual recharge increased as annual precipitation remained above a certain threshold; and in complex areas down to 0.1 aridity index (focused recharge), there was very inconsistent recharge (low precipitation but high recharge). Understanding these relationships can lead to the development of sustainable strategies for water collection. This understanding

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