7: Cage Culture

Cage Culture

utilizes existing water resources but

encloses the fish in a cage or basket

which allows waterto pass freely

Lakes
Reservoirs
Ponds
Quarries
Rivers
Streams
Seas

Potential Sites for Cage Culture

Water Depth
Protection from Wind
Good water quality

Factors to consider in cage culture

3 ppm

Dissolved oxygen concentration

20 – 30 C

Water temperature

7.0 – 9.0

Hydrogen ion concentration (pH)

Water current
Availability of Quality Fingerlings
Market for Cultured Fish
Availability of Labor and Inputs
Accessibility
Peace and Order

factors for site selection FOR FISH CAGE

Frame
Top Cover
Floats
Weight
Anchor
Net

common components in fish cage

floating single cage

common layout of fish cage

Fish cage

made of nets, bamboo, wood, plastic, and steel. It consists of a framework for supporting the weights of the net and

the fish crop, the workers, and workers’ quarter or shed for feeds. A

framework may support a single or multiple net cages.

rectangular
square
Circular

common shapes of fish cages

poor cage construction
stocking undersized
stocking too many fish per cage
stocking too few fish per cage
feeding poor quality feed
overfeeding

Cage Culture Problems

8m x 12m x 3m

10m x 15m x 6m

15m x 20m x 6m

Size of Fish Cages

Fine Mesh Net

Pen Net

A-Net and B-Net

B/R Nylon Net

Polyethylene Net

Type of Nets for Fish Cages

Bamboo Poles
Styrofoam Blocks
Plastic or Tin Drums

Floats Used for Fish Cages

Concrete blocks
Stones/boulders
Lead sinkers
Pipes

SINKERS USED FOR FISH CAGE

5 m or deeper

These are located in sheltered or protected freshwater sites

against winds and waves, with sufficient depths (____)

and moderate water current.

biofouling

growth of algae and bryozoans (soft bodied, jelly-like

animals) on the sides of the cage which restrict water flow through

the cage and cause water quality problems (LODOS)