Lesson 1 Flashcards
Intro
The discipline dealing with the application or utilization of technical engineering knwledge and principles in aquaculture and biological production system
Aquaculture engineering
covers a huge area of knowledge and involves many general engineering specialisms such as mechanical engineering, environmental engineering, materials technology, instrumentation, monitoring, and building design and construction.
Aquaculture Engineering
• Involves production systems with low production per unit volume.
The species being farmed are kept at a low density and there is minimal input of artificial substances and human intervention.
A low level of technology and very low investment per unit volume farmed characterize this method. Pond farming without additional feeding, like some carp farming, is a typical example. Sea ranching and restocking of natural lakes may also be included in this type of farming
Extensive Aquaculture
Production per unit volume is much higher and more
technology and artificial inputs must be used to achieve this. The investment costs per unit volume farmed will of course
also be much higher. The maintenance of optimal growth conditions is necessary to achieve the growth potential of the species being farmed.
• Additional feeding, disease control methods and effective breeding systems also characterize this type of farming. The risk of disease outbreaks is higher than in extensive farming because the organism is continuously stressed for maximal performance.
Intensive Aquaculture
It is also possible to combine the above production systems- this is called semi-intensive aquaculture. An example is intensive fry
Semi-intensive Aquaculture
It is also possible to combine the above production systems- this is called semi-intensive aquaculture. An example is intensive fry
Semi-intensive Aquaculture
where the fish are kept in a enclosed production unit separated from the outside environment
Closed production units
where the unit has permeable walls, such as nets and so the fish are partly affected by the
surrounding environment.
It is also possible to classify the farrn based on where it is located within the sea, in a tidal zone or on land.
Open production units
• If the water is used once, flowing directly through, it is named a _____
flow through farm
If the water is used
several times, with the outlet water being recycled, it is a ______
water re-use or recirculating system.
In a farm the various technical components included in a system can be roughly separated as follows:
• Production units
• Water transfer and treatment
Additional equipment (feeding, handling & monitoring equipment)
In a farm the various technical components included in a system can be roughly separated as follows:
• Production units
• Water transfer and treatment
Additional equipment (feeding, handling & monitoring equipment)
How internal trabsport and size gradong works
Internal transport and size grading
Because of fish growth it is necessary to divide the group to avoid fish densities becoming too high. It is also common to size grade to avoid large size variations in one production unit, for some species this will also reduce the possibilities for cannibalism
How do they Transport of fish?
When juvenile fish are to be transferred to an on- growing farm, there is a need for transport. Either a truck with water tanks or a boat with a well is normally used. The systems for loading may be an integral part of the farm construction
On-growing sea cage farm
Normally a sea cage farm can be run with rather less equipment than land-based farms, the major reason being that water transfer and water treatment (which is not actually possible) are not necessary because the water current ensures water supply and exchange
On-growing sea cage farm
