• Lincolnshire Fisheries

Fisheries in Lincolnshire - Lake Ecology 3



Stratification of water in Lincolnshire Fisheries

This may occur during spring, as the energy slowly increases the water temperature from the sun and the surface layers get warmed. The warmth is not wasted appreciably over night and the temperature persists stable. The lower layers, cut off from the power of the sun, warm more slowly, relying on blending from the surface layer above. In deeper still-water lakes (generally considered to be over 10 m) these two layers become separated as the temperature difference progress and the mixing of the two layers drops. This is known as thermal stratification. The extent at which true thermal stratification actually occurs will vary considerably depending on various factors. The most important is the clarity of the Lincolnshire fisheries water. The clearer the water the more in-depth the sun’s energy can infiltrate. The area that divides the warmer upper layer (epilimnion) from the cooler lower layer (hypolimnion) is named the thermocline. In temperate regions, thermal stratification changes through the seasons. Once a thermocline has developed in the summer, it is usually relatively stable. Throughout the summer the hypolimnion becomes isolated and cool, with limited dissolved oxygen. A significant difference in temperature separates the two layers. However, as autumn advances the warm upper layer drops in temperature. As the two layers get more like in temperature, then some blending will take place and ultimately the thermocline will break down as the entire water body settles at about the same temperature, usually about 10°C. The thermocline can break down very swiftly during a time of stormy weather when there is a rapid drop in ambient temperature and strong wind. This can result in the sudden blending of the warmer, oxygenated epilimnion with the cooler, poorly oxygenated hypolimnion. This can cause a sudden decrease in water quality, resultant stress and even occasional fatalities in carp for sale and tench for sale. This is recognised as the autumn turnover. It should be remarked that a complete and lasting thermocline only happens in relatively deep water bodies.


The ecological significance of temperature in Lincolnshire fisheries

Water temperature is a significant factor as it controls many of the chemical and biological rules that occur in water. Temperature influences the complex interactions of all the parts that form the basis of how we determine water quality. The extent to which this occurs varies both daily and during the year. Being able to command water temperature, especially in larger water forms, is at best useless, but it is crucial to understand the changes that temperature exercises as an environmental parameter. An example of this can be viewed from investigations of best temperature ranges for the transport of live carp for sale and tench for sale. These imply that the generally applicable temperatures, required to provide a conducive environment, are 6–8°C for cold-water fishes such as carp for sale and tench for sale and 10–12°C for warm-water fishes in summertime, 3–5°C for cold-water fishes and 5–6°C for warm-water fishes in springtime and autumn, and 1–2°C for all in winter.


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