Yabbies that are kept in the same tank should always be about the same size as each other. yabbies can live for up to seven years and because they grow fast they need to regularly shed their outer skeleton or shell which makes them prone to being attacked by larger fish such as oscars.. Leave the old shell in the tank as the crayfish will often eat it (it�s a good source of calcium). crayfish prices ranges in cost from $9.95 to $21.95, depending on size and type. a start-up tank, suitable for two yabbies, will cost around $100 and includes a 12 litre tank, gravel, food, plastic weed and a filtration pump. recommended for. The new shell is very soft for a short time, and the yabby is then vulnerable to attack by other yabbies, fish and other predators. the clean, pink shell of the new moult contrasts vividly with the dirty, algae-coated shell of the pre-moult animal, especially in older animals..
Yes kroz i have shell grit in the system at all times, but i will stick with popeyes theory as he has observed their behavior in dams, yabbies eat their shedded shell for a calcium boost, i still think the risk compared to return isn't worth it, a couple of dead yabbies easily poisoned 6000lts of water, return for me out of 200 or so after them. Andrew that seems much to often for me, crabs do not grow quick enough to shed their shell that much. i always thought it was once a year at most, i hope it wasn't where i work that told you this.. Yabbies have a hard exoskeleton which limits their size, for them to grow they must moult the old shell and grow a new one. in good farm dam situations the majority of your population going from newborn to over 100mm (50 grams) in one year is normal..
