Larval rearing units



Aquabiolab designs and manufactures high quality fully recirculating life support systems designed for research with small-bodied marine life in a totally controlled environment.

An outstanding versatile tank for  hatching & feeding fish larvae
and for rearing fingerlings in a small footprint

These versatile tanks are currently used to hatch nauplius larvae of Balanus, smelt, cod, walleye, lobster, etc., and for rearing fingerlings in a compact, convenient manner.

Their design is based upon the well known Krescel–type tanks for the early rearing of larval species. Four refinements make these new KRESCEL PLUS™ larval rearing basins better hatching & first feeding larval tanks.

CCAC Guideline

Guideline 21

The shape, colour, depth, and volume of tanks should be appropriate for the species and life stage being held.

Section 5.2 Tank/enclosure design, p. 28

Guideline 9

In designing and constructing aquatic facilities, assistance should be sought from people with experience in this field.

p. 22

Two Operating Modes: 
Larval rearing and Fish Rearing Modes

Four refinements !

1. Surface Spray

A surface spray is added above the water to free surface from lipid film and to help larvae fill their gas bladder;

     

2. Dual inflow for higher larva survival

  • A dual inflow (bottom and surface) is created for homogeneous and complete water circulation and better dispersion of larvae within water column;

 

 

 

 

 

 

 

 

 

 

 

  • Water is introduced through obliquely-oriented slits along a semi-spherical bottom and a surface spray;
  • Larval dispersion is more uniform in absence of temperature and oxygen stratification:  the dual inflow of the Krescel tank prevents the formation of the water quality gradient that normally occurs at high air/water thermal differential and low flow rates;
  • For more flexibility, a valve allows you to adjust the water flow between the surface and bottom inlets;

 

3. A triple stand pipe for greater flexibility

  • The overflow standpipe located in the center of the tank through which water exits is now surrounded by two perforated pipes covered with a nylon screen (NYTEX);
  • With this pattern, it is at last possible to remove one pipe for cleaning, without the risk of losing fish;

4. It becomes a convenient self-cleaning, all-purpose rearing tank!

  • Once fish swim actively, the Krescel Plus™ tank is easily converted into a compact self-cleaning rearing basin;

 

  • The sediment trap that is already located at the bottom of the tank only needs to be turned into working position. Solids that concentrate around the bottom will be flushed out as the sediment purge valve is turned to the open position.   A sediment flushing is recommended once or twice a day.
  • A circular current is created by replacing the surface spray by our curved tangential injector (included). You virtually have two tanks into one!  A sediment flushing is recommended twice a day

 

 

 

 

 

It becomes a convenient self-cleaning all-purpose rearing tank!

 

Advantages and Benefits

Flexibility

  • Once fish swim actively, the Krescel Plus™ tank is easily converted into a compact self-cleaning rearing basin;
  • The bottom injector is simply replaced by a curved tangential injector lined with a row of fine holes that creates an adjustable circular current within the tank;
  • These modifications are easily done with no disturbance to the fish in the tank;

Save time, and money with a low maintenance system

  • Self-cleaning tanks, the sediment trap already located at the bottom of the tank only needs to be turned open;
  • When opened, the system will flush the sediments that concentrate around the bottom as the purge valve is opened.

Higher larval survival rate!

  • Larval dispersion is more uniform in absence of temperature and oxygen stratification.
  • The dual inflow of the Krescel tank prevents the formation of the water quality gradient that normally occurs at high air/water thermal differential and low flow rates.

Requires very little space!

  • Compact, the system only requires 2 ft x 3 ft x 3 ft high (61 x 92 x 92 cm high), and can be staked.
  • Leg height is adjustable.

High quality and very robust!

  • Tanks are made of fiberglass with the inside coated with food-approved dark grey gelcoat;
  • All systems are mounted on a high-strength fiberglass and plastic stands with built-in MicrobanŽ antimicrobial protection;

Learn more about Microban technology

Interesting option!

  • Krescel Plus™ tanks can also be associated with our REBF (water REcycling with BioFiltration) Modules for complete control over rearing conditions. 

                                                                                    Closed-circuit Larval Rearing Unit with 170-L Tanks

Aquabiolab's equipment comes with an equivalent highly professional service. Customer oriented, our sales team is dedicated to walk you through each step into designing the right system for your needs.

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