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Schedule 3: stocking densities - ornamental fish

Schedule 3: stocking densities - ornamental fish

        
  1. It is virtually impossible to determine the quantity of fish to be kept purely on a weight/volume ratio.
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  3. The variation in system design, husbandry techniques and types of fish involved would render any such method too simple to be useful or too complicated to be practical.
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  5. The maintenance of water quality standards is essential and is a simple but effective way to determine stocking densities. Water quality testing should be carried out at least once a week in centralised systems and 10% of individual tanks should likewise be tested.  Unsatisfactory test results must be recorded in a register, together with the corrective action taken.  Further tests must be carried out when visual inspection of the tanks indicates the need.
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  7. Further advice and guidance on water quality criteria can be obtained from the Ornamental Aquatic Trade Association Ltd from the address at annex 1.

Water quality criteria (1mg/litre - 1ppm) - Cold Water

ComponentAmountMeasurement
*Dissolved oxygen- min6mg/litre
*Free ammonia- max0.02mg/litre
Nitrate- max50mg/litre above ambient tap water
Nitrite- max0.2mg/litre
* These parameters should be checked first. Only if a problem exists with these tests is it necessary to check nitrite and nitrate levels.

Water quality criteria (1mg/litre - 1ppm) - Tropical Fish

ComponentAmountMeasurement
*Dissolved oxygen- min6mg/litre
*Free ammonia- max0.02mg/litre
Nitrate- max50mg/litre above ambient tap water
Nitrite- max 0.2mg/litre
* These parameters should be checked first. Only if a problem exists with these tests is it necessary to check nitrite and nitrate levels.

Water quality criteria (1mg/litre - 1ppm) - Tropical marine species

ComponentAmountMeasurement
*Dissolved oxygen- min5.5mg/litre
*Free ammonia- max0.01mg/litre
*pH (tropical marine only)- min8.1
Nitrate- max40mg/litre. This is an absolute figure: it does not relate to ambient tap water.
Nitrite- max0.125mg/litre
* These parameters should be checked first. Only if a problem exists with these tests is it necessary to check nitrite and nitrate levels.

Licensing

North Kesteven District Council
Kesteven Street
Sleaford
Lincolnshire
NG34 7EF

Tel: 01529 414155
Fax: 01529 308394
Email: licensingteam@n-kesteven.gov.uk