We have started a feed trial with Jade Perch. The idea behind the 12-month trial is to see just how well the Jade Parch will grow being fed anything they will eat that can come off the land rather than use fish feed pellets that contain ocean derived fish meal.
With a view toward long-term sustainability, I feel we need to discover and refine feeding methods that are not dependent on ocean fish stocks. Seems elementary, but I really want to see just how well it will or will not work.
Expectations: I believe we will get the fish through to the 12-month point in a healthy state, after all, Jade Perch in the wild eat plant material and algae etc. I imagine that we will see slower growth in the plant fed fish but I believe they will be very healthy.
Time will tell.
In my INDY 23 system I have 2 x IBC tanks that are all part of the same system. Same water same pump system etc. I feel it is an ideal setup to test two identical batches of fish that share the same conditions except fo the feed they get.
There are 65 Jades in each tank. The fish are supplied by Ausyfish at Childers.
They have been in the tanks for one month. The trial feeding started 1st March.
Weigh in on 1st April.
The batch of 130 fish were evenly divided as to size as near as we could. Very difficult when they are so small approx 10g each fish; so we started with 650g of fish density in each tank.
Tank "A" is been getting up to 50g of 2mm pellets per day.
The pellets are as below
Protein Min 35 %
Fat Max 10 %
Moisture Max 10%
Ash Max 11%
Chilean Fishmeal, Wheatflour, Soybean Meal, Shrimp meal, Squid, Aquamix,
Tank "B" is getting a diet of lettuce, cooked carrot, cooked pumpkin, Kang kong leaves, honeydew melon, eggplant, cucumber. It is difficult to know just how much to give tank "B" every day but we are getting better at keeping the feed up to them.
First weigh in on 1st April.
Sample of 20 randomly caught fish from each tank gave the following results.
The fish were weighed as a batch.
Group "A" = 30g
Group "B" = 23g
Group "B" have not put on much weight at all; 3g over 20 fish. So we need to up their feed somewhat.