Tanks may be expensive, but are common where space is limited, or where earthen ponds are impractical because of unfavorable topography. Tanks with a surface area less than 50 m2 and a depth of 1 m are manageable, but commercial producers may prefer tanks of 100 m2 surface area or larger. Tanks may be constructed from a variety of materials and in different shapes and sizes. Tank Placement Tanks may be located in enclosed buildings, outside or under partial cover.
Temperature is a major factor affecting tank location.
Tanks built outside may only be useable during the warm season in temperate climates. Energy used to heat water will increase costs and may make fry production unprofitable. Overheating is seldom a constraint for tilapia fry production, but where daily temperature becomes very high, partial shelters may be built over tanks. A roof is often built over tanks to provide laborers with a comfortable working environment. Expensive materials such as plywood, fiberglass or metal sheets may be used, but inexpensive palm branches or woven grass roofs are also functional.