Fish and Feret 1 mod 9
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Questions and Answers

Which country is the largest supplier of tropical freshwater fish in the ornamental fish trade?

  • China
  • Singapore (correct)
  • Japan
  • Brazil
  • What is the main source of coldwater fish like Koi carp?

  • UK
  • Japan (correct)
  • Indonesia
  • Singapore
  • Which two countries are the main sources of tropical marine fish in the ornamental fish trade?

  • US and UK
  • Indonesia and the Philippines (correct)
  • China and Singapore
  • Brazil and Japan
  • Which type of fish is stenothermic and prefers temperatures between 82-88°F?

    <p>Discuss</p> Signup and view all the answers

    What is the recommended wattage of UV-light per litre of water in a tropical fish tank?

    <p>0.5 watts</p> Signup and view all the answers

    How long does it typically take for denitrifying bacteria to colonize biological filters in a new tank set-up?

    <p>6-8 weeks</p> Signup and view all the answers

    During the process of breeding Koi carp, when are the females injected for the second time?

    <p>24 hours after the first injection</p> Signup and view all the answers

    What is added to the eggs and milt to reduce the stickiness of the eggs?

    <p>Saline and urea</p> Signup and view all the answers

    In marine tanks, what is the recommended stocking level in relation to the volume of water?

    <p>1cm of fish per 3.5 litres of water</p> Signup and view all the answers

    Which of the following is the best method to measure water hardness?

    <p>Using a colorimetric photometer</p> Signup and view all the answers

    Which of the following is NOT a standard water quality test to be assessed?

    <p>Calcium levels</p> Signup and view all the answers

    Which of the following pH levels is suitable for marine fish?

    <p>pH 8-10</p> Signup and view all the answers

    Which type of filter is prone to disruption by bottom feeding fish and can be inefficient in large tanks?

    <p>Gravel filters</p> Signup and view all the answers

    Which type of filter is ideal for larger tanks but can be expensive in terms of start-up costs and maintenance?

    <p>Power filters</p> Signup and view all the answers

    Which type of filter is used to suspend particles of sand in a column of water, increasing the surface area available for denitrifying bacteria to attach to?

    <p>Sand filters</p> Signup and view all the answers

    Which of the following factors can cause a decrease in oxygen carrying capacity of water?

    <p>All of the above</p> Signup and view all the answers

    At what level of oxygen concentration does anoxia occur?

    <p>4mg/L</p> Signup and view all the answers

    What problem may occur in fish if there is too much oxygen in the water?

    <p>Gas bubble disease</p> Signup and view all the answers

    Which of the following is NOT a factor that can reduce oxygen levels in water?

    <p>None of the above</p> Signup and view all the answers

    What is the minimum level of oxygen concentration required for healthy fish?

    <p>6mg/L</p> Signup and view all the answers

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