These high densities fish culture system have distinct disadvantages including:  More rapid disease spread, less reaction time when problems occur, and large volumes of effluent with dilute fish wastes.In general, water cannot be economically pumped through raceways it must flow through them by gravity. 
The disadvantages of raceways are primarily related to their need for large constant flows  of consistent, high-quality water. Also, the viability of the project often requires that the water gravity flows through a series of raceways before it is released. This adds a requirement for an elevation of the water source and suitable topography for the gravity flow between raceways and so it can be said that the site selection is not in the farmer's hand. 

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