What is wrong with current redclaw crayfish stocking practices?

Known Inefficiencies with Current Stocking Practices

  • Stocking numbers are dependent on the numbers of berried females, which makes it nearly impossible to predict stocking numbers.
  • Current stocking practices are not conducive to control of genetics, which leads to inbreeding issues.
  • There’s neither control nor accurate information on stocking density, size variations or survival rates, which respectively and cumulatively lead to unpredictable production outcomes.
  • Stocking and harvesting are labour intensive and season dependent—because berried females are required to stock new ponds, not to mention that spawning is season dependent.
  • Stocking and harvesting of ponds are linked—ponds must be harvested to stock new ponds, making stocking quite complicated an exercise.
  • Production outcomes are unpredictable—as accurate stocking density is unknown.
Current stocking practices are not conducive to control of genetics, which leads to inbreeding issues.
Read further to learn the many benefits of ACH’s ‘Batch in, Batch out’ (BiBo) stocking solution.
Measuring craylings length for best stocking practices

ACH Batch in/Batch out (BiBo) Solution

  • ACH offer a simplified method of stocking and harvesting ponds by providing a “batch-in, batch-out’ method.
  • Farmers simply add a specific number of same age ACH craylings to new ponds without the need for harvesting a pond and sorting harvested animals.
  • That also means that there is no need for additional ponds to hold juveniles or broodstock, which in turns allows farmers to utilise all ponds for production.

Further Benefits of Using ACH's BiBo Solution

By using ACH craylings and the ‘batch-in, batch-out’ method, you will: 

  • avoid inbreeding and as a result you'll be getting stronger, faster growing animals.
  • Reduced size variation at harvest, reducing labour costs and time.
  • Stocking and harvesting of ponds are not linked and can be undertaken at any time.
  • Farmers can accurately predict and monitor production outcomes increasing productivity and profitability.
  • Low labour requirement—Batch-in, batch-out method. No need to sort animals into groups for re-stocking.
  • ACH produces healthy, specific pathogen and antibiotics-free craylings from selectively bred broodstock, that eliminate inbreeding issues altogether.

Summary of ACH Solutions

Current Practices

Traditionally, production in Australia has relied on stocking clay ponds with large crayfish breeders for harvest of  5-15 g juveniles that are stocked in growout ponds and reared 9 months to commercial size (70 g). This presents a number of problems:
  • Lack of control of reproduction.
  • Increase of diseases affecting egg and juvenile survival.
  • High levels of juvenile loss due to cannibalism and predation during the extended rearing time.
  • Variable age of harvested juveniles, where mixed cohorts in the pond may affect commercial harvest distribution spread, female size and biomass composition.
  • Unreliable supply of uniform commercial size crayfish to the market.
  • Although there are significant innovations, this production strategy has remained largely unchanged in commercial farms.

ACH Novel Solutions

Among the knowledge-based technology advances, we now:
  • Produce significant numbers of high-quality anti-biotic free, specific pathogen free (SPF) juveniles in ponds or hatcheries.
  • Apply molecular marker assisted genetic selection programs to improve growth rate, disease resistance and juvenile production.
  • Obtain feed conversion rates of around 1 – 1.4: 1.
  • Eliminate water exchange and discharges of wastes to the environment.
  • Harvest 5-6 tonnes per hectare /140-day cycle, of 60-90 g monosex individuals.
  • Deliver consistent product sizes (60-90 g) to the market year-round.
  • Significantly increase production through growout modules that are economically viable, environmentally sustainable and socially responsible.

Learn more about how ACH implements best stocking practices and presents opportunities for investment in redclaw crayfish growout farming

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