29 Questions
What is the primary function of oxygen in fish?
To break down protein and produce energy
What is the recommended type of feed for recirculation systems?
Dry feed
What happens to carbon dioxide and ammonia in a fish rearing system?
They are excreted from the gills into the water
What is the benefit of improved feed conversion rate (FCR) in fish farming?
Higher production yield and lower impact on filter system
What is the purpose of designing feeds specifically for recirculation systems?
To minimize ammonia excretion into the water
What is a critical aspect of tank design in fish rearing systems?
Meeting the needs of the fish in respect of water quality and tank design
What is the main purpose of a recirculation system in a fish farm?
To treat the water continuously to remove waste products and add oxygen
What happens to the water after it leaves the fish tanks in a recirculation system?
It flows to a mechanical filter and then a biological filter
What is the purpose of aeration in a recirculation system?
To add oxygen to the water
What is the result of the fish eating and digesting food in a fish farm?
The fish grows and develops
What is the purpose of biological treatment in a recirculation system?
To remove waste products and add beneficial bacteria
What can be added to a basic water treatment system in a recirculation system?
Several facilities such as oxygenation, ultraviolet light or ozone disinfection, automatic pH regulation, and more
What is the primary reason for providing ample tank surface area for bottom-dwelling fish?
To accommodate their natural bottom-dwelling behavior
Which species perform better with larger water volumes?
Pelagic species
What happens to the sludge after it flows out of the filter?
It is treated externally in a waste water treatment plant
What is the effect of higher water speeds on pelagic species?
They benefit from it
What is the benefit of a circular tank design?
It creates a circular water flow pattern
What is an advantage of microscreen filtration?
Reducing organic load on the biofilter
What is the recommended pH range for optimal biofiltration?
Between 7.0 and 7.5
What is the effect of increasing pH on ammonia toxicity?
It intensifies ammonia toxicity
What is an alternative method to increase oxygen levels in fish farming?
Direct injection of pure oxygen
What is the end product of nitrification in a biofilter?
Nitrate
What are the two major factors that affect pH in a water recirculation system?
CO2 production and nitrification
What is a necessary condition for optimal nitrification?
pH levels between 7 and 8
Why is managing oxygen levels crucial in fish farming?
For fish welfare
What is the purpose of heterotrophic bacteria in the biofilter?
To oxidize organic matter
What is added to the water to stabilize the pH?
A base
Why does the nitrification process affect the pH level?
It produces an acid
Why is nitrogen in the form of free ammonia a concern?
It is toxic to fish
This quiz covers the principles and components of recirculation systems in aquaculture, including water treatment and oxygenation.
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