MISCELLANEOUS

In addition to its ponds and its water distribution systems a freshwater prawn farm has the following equipment and facility requirements:

power;

roads and access paths;

accommodation: every farm should have accommodation for some of its workers to live on site;

fencing: a perimeter fence and, on larger farms, lighting, to deter poachers (human predation);

storage facilities: dry storage is needed for feeds (or ingredients), chemicals, nets, etc.;

feed distribution and monitoring equipment;

nets;

water quality monitoring equipment;

predator protection; and
transport: larger farms will need trucks for prawn distribution and feed collection.

TABLE 15 Oxygen transfer efficiencies of basic types of aerator

TYPE OF AERATOR  AVERAGE OXYGEN TRANSFER EFFICIENCY (kg O2/kWhr)
Paddlewheels            2.13
Propeller-aspirator pumps 1.58
Vertical pumps          1.28
Pump sprayers          1.28
Diffused air systems  0.97

FIGURE 59

Pond outlets need to be screened to prevent the loss of your prawns; this type of structure can be designed to hold screens and to control the flow rate

SOURCE: EMANUELA D’ANTONI

FIGURE 59 cont.

SOURCE: EMANUELA D’ANTONI