Recirculation Systems in Aquaculture
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Questions and Answers

What is the primary function of oxygen in fish?

  • To convert dry feed into pellets
  • To break down protein and produce energy (correct)
  • To produce ammonia and carbon dioxide
  • To excrete waste products

What is the recommended type of feed for recirculation systems?

  • Wet feed
  • Live feed
  • Dry feed (correct)
  • Trash fish

What happens to carbon dioxide and ammonia in a fish rearing system?

  • They are excreted from the gills into the water (correct)
  • They are absorbed by the fish
  • They are excreted into the air
  • They are broken down into oxygen

What is the benefit of improved feed conversion rate (FCR) in fish farming?

<p>Higher production yield and lower impact on filter system (C)</p> Signup and view all the answers

What is the purpose of designing feeds specifically for recirculation systems?

<p>To minimize ammonia excretion into the water (C)</p> Signup and view all the answers

What is a critical aspect of tank design in fish rearing systems?

<p>Meeting the needs of the fish in respect of water quality and tank design (D)</p> Signup and view all the answers

What is the main purpose of a recirculation system in a fish farm?

<p>To treat the water continuously to remove waste products and add oxygen (B)</p> Signup and view all the answers

What happens to the water after it leaves the fish tanks in a recirculation system?

<p>It flows to a mechanical filter and then a biological filter (B)</p> Signup and view all the answers

What is the purpose of aeration in a recirculation system?

<p>To add oxygen to the water (B)</p> Signup and view all the answers

What is the result of the fish eating and digesting food in a fish farm?

<p>The fish grows and develops (D)</p> Signup and view all the answers

What is the purpose of biological treatment in a recirculation system?

<p>To remove waste products and add beneficial bacteria (B)</p> Signup and view all the answers

What can be added to a basic water treatment system in a recirculation system?

<p>Several facilities such as oxygenation, ultraviolet light or ozone disinfection, automatic pH regulation, and more (B)</p> Signup and view all the answers

What is the primary reason for providing ample tank surface area for bottom-dwelling fish?

<p>To accommodate their natural bottom-dwelling behavior (B)</p> Signup and view all the answers

Which species perform better with larger water volumes?

<p>Pelagic species (D)</p> Signup and view all the answers

What happens to the sludge after it flows out of the filter?

<p>It is treated externally in a waste water treatment plant (D)</p> Signup and view all the answers

What is the effect of higher water speeds on pelagic species?

<p>They benefit from it (B)</p> Signup and view all the answers

What is the benefit of a circular tank design?

<p>It creates a circular water flow pattern (C)</p> Signup and view all the answers

What is an advantage of microscreen filtration?

<p>Reducing organic load on the biofilter (B)</p> Signup and view all the answers

What is the recommended pH range for optimal biofiltration?

<p>Between 7.0 and 7.5 (C)</p> Signup and view all the answers

What is the effect of increasing pH on ammonia toxicity?

<p>It intensifies ammonia toxicity (D)</p> Signup and view all the answers

What is an alternative method to increase oxygen levels in fish farming?

<p>Direct injection of pure oxygen (C)</p> Signup and view all the answers

What is the end product of nitrification in a biofilter?

<p>Nitrate (A)</p> Signup and view all the answers

What are the two major factors that affect pH in a water recirculation system?

<p>CO2 production and nitrification (B)</p> Signup and view all the answers

What is a necessary condition for optimal nitrification?

<p>pH levels between 7 and 8 (A)</p> Signup and view all the answers

Why is managing oxygen levels crucial in fish farming?

<p>For fish welfare (A)</p> Signup and view all the answers

What is the purpose of heterotrophic bacteria in the biofilter?

<p>To oxidize organic matter (B)</p> Signup and view all the answers

What is added to the water to stabilize the pH?

<p>A base (C)</p> Signup and view all the answers

Why does the nitrification process affect the pH level?

<p>It produces an acid (D)</p> Signup and view all the answers

Why is nitrogen in the form of free ammonia a concern?

<p>It is toxic to fish (A)</p> Signup and view all the answers

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