So, let’s look further into the measures to take for a profitable Yabbyponics production of juveniles.
As you may already know this is the first year for My Rivendell Aquaponics Farm that we’re carrying out the reproduction of Yabbies.
Moreover, exactly as it occurred with our crops, because of the exceptional low temperatures experienced in May, we witnessed a delay in the reproductive activities of Yabbies reared since September 2018 in our indoor mating tanks. Beside their young age, that is mostly correlated with the maturity of females.
In fact, as I explained and pointed out in the second section of this series on Yabbyponics, the main factors that affect the productiveness of a stock are:
- the age (1-2 years old for females)
- the water temperature (20-25°C [68-77°F])
- the photoperiod ( ≥ 14 hours)
Therefore, now that the temperature is constant on the 25°C (77°F), we are looking after the next broods. Indeed, some South Australian studies suggest that this temperature guarantees the fastest growth of the common Yabby (Cherax destructor).
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1000 juveniles a year per female
Anyway, in warmer regions, farmed Yabbies have shown to undertake multiple broods throughout the all year. While, commonly they reproduce just three times a year, producing around 1,000 juveniles per female. Of course, the number of eggs a female can spawn depends on her size and age. Bigger she is, more eggs she spawns.
So, this is the first trick for getting an high production of juveniles.
But, remember that the volume of your yearly Yabbyponics production doesn’t exclusively rely on the success of the reproduction phase. Because, after the release of the juveniles, you must prevent the substantial losses due to their increased aggressiveness and fights for food.
In other words, you must take some measures for reducing the high morality rate usually registered at this stage.
Furthermore, you must provide the ideal conditions for them to grow out faster. In such a way to make them reach a marketable size in few months, if you want to sell young specimen for aquariums or juvenile stocks for other farms. Whereas, if your Yabbyponics production is addressed to the food supply chain, they may reach 15 cm in 12 months under optimal farming conditions.
Such as the green water or floating aquatic plants (i.e duckweed) for inducing them to feed more frequently, even in daylight. (Otherwise, they’d feed only at night when they feel safe.)
As well as a high concentration of dissolved calcium. That means a water hard enough to maintain strength in the shell during the moult.
So much as high levels of dissolved oxygen. Especially when the water temperature rise above 25°C. In fact, despite the adults are tolerant to poor oxygen water – being able to breathe atmospheric air- the juveniles show to be highly sensitive to such conditions. Therefore for preventing any loss caused by them, I suggest you to use two aerators inside the tanks during the hottest months.
I tested the water parameters respectively inside the small-size nursery tanks and in one of our self-cleaning aquariums, since in all the 3 I’m keeping the Yabby juveniles. Moreover, in the latter I’ve juvenile guppies, Neocaridina davidi and freshwater snails, as well. And despite such a crowd the levels of nitrites and nitrates are really low. Then, comparing the pH levels in these three farming scenarios, the nitrifying activies that are going on in the self-cleaning aquarium are obvious.
We’ll talk through the most complete diet for Yabbies and the feeding frequency according to the growth stage they are in.
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