A fish holding tank is a device or installation designed to keep fish alive after they are caught, while waiting for transport, sale, or processing.

Main Characteristics:

1. Structure:

   • Made of concrete, reinforced plastic, stainless steel, or fiberglass.

   • Various shapes: rectangular, cylindrical, in-ground, or above ground.

   • Capacity ranges from small tanks (hundreds of liters) to large basins (several cubic meters).

2. Integrated Systems:

   • Oxygenation system (aerators or air/oxygen diffusers) to maintain dissolved oxygen levels.

   • Water filtration (mechanical and biological) to remove waste and toxic substances.

   • Temperature control, when needed, using chillers or heaters.

   • Water renewal system (pumps or continuous supply of clean water, sometimes seawater).

3. Uses:

   • In ports to store fish after capture.

   • In aquaculture for sorting, weighing, or transport.

   • In fish markets or stores to keep fish fresh before sale.

Advantages:

• Maintains fish quality and freshness.

• Reduces post-capture losses.

• Allows stock management based on demand.