Semi-intensive commercial yabby farming produces quantities of yabbies at far higher densities than occurs naturally in the wild. Ponds are built to specifications that suit the yabbies, shelter is added and food is supplied. All this is inducive to growing large numbers of yabbies quickly.
Now the yabby Cherax destructor is one of the few species on this planet that is increasing its area of domination. I know you can google it and the International Union for the Conservation of Nature Red List shows the species as vulnerable but that’s not the case. Yabbies are a robust species with an instinct to wander and distribute. They are a migrating species and can migrate on mass. It’s extremely easy and common at night when you get a bit of rain to have yabbies leave the pond they are in and go a wondering. They can travel long distances overland and survive for days in wet grass. The larger the yabbies and the higher the density of yabbies in your pond, the greater the chances of wondering occurring.
Perimeter fencing of your ponds is essential for semi intensive production of yabbies. There are a number of choices for perimeter fencing (you can see more options in The Commercial Yabby Farmer book) but this article is on the most expensive, but also the most permanent option.
Metal fencing is one of the most expensive options, but one of the easiest to erect and lasts the longest with the least maintenance over the years. This article is based on fencing I’m installing at “Yabby Dabba Doo” Yabby Farm, Port Stephens, NSW. http://www.yabbydabbadoo.com/
This property adjoins the state forest that is subject to bushfire so the metal fencing has the added benefit being fire proof compared to say “silt stop barrier” fences.
0.48mm Trimdek or equivalent roofing sheets
40 mm x 0.55 mm Top Hat Battens
Hex head Screws
Full 6 metre sheet of trimdeck are purchased and just cut in half down the middle with a hand grinder. This gives you two sheets roughly 400 mm wide. Top hat battens are cut at 750 mm lengths.