fish farming in cages (p2) Flashcards
1
Q
What is a fish farm?
A
A place where fish are raised to be food
2
Q
Why are fish kept in cages?
A
- prevents the fish swimming so they use less energy
- protects them from
interspecific predation
3
Q
Why is the diet of food pellets they eat carefully controlled?
A
- maximises the amount of energy they get
- the fish will grow bigger and quicker
4
Q
Why are young fish reared in special tanks?
A
- to ensure as many survive as possible
- to keep them separate from the larger fish (intraspecific predation)
5
Q
What is the problem with having fish kept in cages?
A
- more prone to disease and parasites, such as sea lice
6
Q
How can you solve the higher likelihood of parasites like sea lice?
A
- can be treated with pesticides
- however chemical pesticides cause pollution, so biological pest control is sometimes used instead
7
Q
Give an example of biological test control?
A
- a wrasse which eats lice off of the backs of salmon
8
Q
What characteristics are the fish selectively bred for?
A
- less aggressive
- faster growing
9
Q
Interspecific predation definition
A
An organism that is eaten by an organism of a separate species
10
Q
Intraspecific predation
A
An organism that is eaten by an organism of a same species
