Salinity in o as a function of temperature and density

In aquariums, the density (S.G.) must be between 1.022 to 1 024 for a temperature of 25-26°C

t°c

Density

1,012

1.019

1.020

1.021

1.022

1,023

1.024

1.025

22

26.7

28,1

29.4

30.7

32,0

33.4

34.7

36.0

23

27.1

28.4

29.8

31.1

32,4

33.7

35 1

36.4

24

27.5

28.8

30,1

31.5

32.8

34.1

35.4

36,8

25

27.9

29.2

30.5

31.9

33.2

34.5

35.8

37.2

26

28.3

29.6

30.9

32.3

33.6

34.9

36.2

37.6

27

28.7

30.0

31.3

32.7

34.0

35.3

36.7

37.8

28

29.1

30.9

31.8

33.1

34.4

35.8

37.1

38.4

In aquariums, the density (S.G.) must be between 1.022 to 1 024 for a temperature of 25-26°C

FINDING OUT THE CHARACTERISTICS OF NATURAL WATER

The European Union has set compulsory standards for drinking and environmental quality, but the strict legislation in the UK goes well beyond these. In England and Wales, for example, domestic water is monitored by the Drinking Water Inspectorate, which regularly checks up on the practices of the water companies and investigates any possible infringement of the law.

The Environment Agency, on the other hand, is responsible for the quality of water in rivers, estuaries, and coastal areas. It issues licenses to discharge waste into these waters and takes chemical and biological samples to monitor the effect on the environment. The results of these controls are available to the public.

Once a marine tank has been put into operation, the nitrogen cycle is slower to take effect than in a freshwater tank: around 3-4 weeks (although this is a generalization, as every aquarium is unique). Fish or other animals must not therefore be put into the water during this period, although the length of time can be reduced by various means (see Assembling your Tank, page 218), based on the principle of introducing bacteria. In any event, measuring the nitrite levels is an excellent indicator of the progress of the nitrogen cycle.

Once the water has been put into the tank, this parameter must be measured regularly; when the quantity of nitrites goes down close to zero, the nitrates appear and you only need to wait a few days before inserting the fish. Nevertheless, measuring the nitrites at regular intervals is still highly recommended, as long as the aquarium is in use.

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