Commercial Seafood System

Commercial Seafood, Crab, Lobster System Capabilities

  • Wood, stainless steel welding, plastics (ABS, acrylic, polycarbonate, PVC)Chiller condensing units (EPA 608 certification)
  • HVLP spray painting
  • CAD/SketchUp interpretation
  • Design drawings using 3d modeling in SketchUp

Tank Components

  • Hard plumbing via Pvc pipeIf flexible fittings are used, barbed nipple fittings are utilized
  • Schedule 80 bulkheads; thicker gaskets for long term leak prevention
  • Volumes are calculated for application Typically the water is re-circulated through the system at 6-8x an hour. External pumps for applications in excess of 1000 gph
  • Drop in submersible pumps for applications under 1000 gph
Chiller/Refrigeration Selection:
  • Temperature parameters of species being kept will also decide condenser unit size. Freshwater species require less heat removal, 55-65*F 40-45 degrees F for saltwater. Saltwater species such as Atlantic lobster and dungeness crab will last longer at colder temperatures, this reduces their metabolism and stress levels. They will fight less. Volume of system: Volume of water and local climate will decide the size of the condenser unit. The removal of tank water heat at the highest temperature will be calculated in order to reduce temperatures.
  • Condenser Unit: Indoor condenser units will dispense heat and noise near the display tank, but be less labor intensive and easier to install. Outdoor condenser units are placed remotely such as on the roof in order to dispense heat and noise. These systems take more time during installation and also require remote power.
  • Heat Exchanger Style: Heat exchanger coils (evaporator) can be placed inside or externally in the tank system. Drop in coils are easier to prevent from freeze up, where an ice cube forms around the coil and restricts water flow. Heat exchanger tubes can be placed externally and hidden from view, they can sometimes build up ice and require an automatic or manual defrost cycle.

Custom Sump Capability

  • Built in ReservoirSock Holders
  • Probe Holders
  • Bubble Traps
  • Weir
  • Overflow Tank Capacity
  • ATO Auto Top Off


  • High stocking levels require more dissolved oxygen.Size of system will decide the type of aeration machine.
  • Listed by smaller to larger tank systems and by noise level.
  • diaphragm air pump (quiet)
  • linear air pump (moderate noise)
  • regenerative blower. (very noisy, must be placed remotely)
  • Reference:

Filtration/ Tank Seasoning

Ammonia is produced by live animals and is dealt with using filtering bacteria via the nitrogen cycle. These bacteria must be seeded and grown in the system in order to provide good water quality. Overstocking of new tank systems is not possible without a supporting population of bacteria. It takes a good 6 weeks to grow enough bacteria to maintain many live animals. A new system takes time to mature, a quarter of full stocking capacity must be placed in a new system.

  • Biological Filter Media
    • A high surface area where filtering bacteria live must be provided.
    • We typically use oyster shell and or biological beads.
    • This media is only removed and added in portions in order to prevent clogging
    • This media is a natural filter, it is left in the running tank even if there are no live animals.
    • The media itself is alive over time.

    Seafood Tank at the Gum Sun Market, San Francisco China Town