Flowthrough system

This system is based on continuous water flow through the rearing tanks. It depends on close proximity to large supplies of suitable water. Sites should preferably be far from cities, harbours and industrial centres, or other activities which may pollute the water supply. The ideal site allows direct access to both freshwater and seawater. For this reason, coastal sites with sandy beaches and coral reefs are often preferred, but this is not a limiting factor. In Thailand, brine

UV unit

Biofilter

Fig. 5.1 Water flow through basic components of a dynamic closed system.

UV unit

Biofilter

Fig. 5.1 Water flow through basic components of a dynamic closed system.

or rock salt is transported for dilution in inland hatcheries operating in flow-through systems.

Valenti (1996) described various problems associated with flow-through systems. These include causing shock to larvae by adding make-up water, the peaking of ammonia levels (reaching ~2 mg/L immediately before water exchange), and increasing stress and cannibalism among larvae as density increases during water level reduction.

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