19
8.3.2. Hatching of the salt water prawn
To hatch the prawn it is essential to first have
a saline solution suited to the prawn‘s needs.
Fill half a litre of rain- or fresh-water in a
container. Let it stand for about thirty hours.
As water evaporates over time it‘s a good idea
to have a second container of such water left
standing for thirty-six hours. Once it‘s stood
for this length of time pour half of the sea
salt supplied into one of the containers (Fig
2, 25c) and stir until it has dissolved. Then
pour some of it into the prawn breeding plant
(Fig 2, 23). Add a few eggs and close the lid.
Put it somewhere with plenty of light but not
in the direct sun. The temperature should be
approximately 25° C. The prawns will hatch in
two or three days at this temperature. Should
any water evaporate during this time replace it
from the second container.
8.3.3. The saltwater prawn under
the microscope
What comes out of the egg is known as
a nauplius larva. Use the pipette (Fig 2,
22a) to put some of them on a slide for
examination. They will move in the solution
using their hair like limbs. Remove a few daily
from the container for examination under
the microscope. If you do so and save the
pictures made with the MicrOcular you will
then have a seamless record of the prawn‘s
lifecycle. You can remove the upper lid of
the prawn bleeding plant and put the whole
thing under the microscope. The larvae will
mature in six to ten weeks depending on
ambient temperature. You will soon have bred
an entire generation of saltwater prawns that
constantly reproduce.
8.3.4. Feeding your saltwater prawns
To keep them alive saltwater prawns must be
fed occasionally. This must be done carefully as
overfeeding causes the water to stagnate and
poison the prawns. Feeding is best down with
dry powdered yeast (Fig 2, 25a). Give them
a little every other day. If the water darkens
this signifies it is stagnating. If so remove the
prawns and put them in a fresh saline solution.
9. MicrOcular setup
nOTe:
The MicrOcular only works
without the Barlow lens sup-
plied. Magnification setting is
changed by using the MicrO-
cular and must be reset by
focussing anew.
Remove the Barlow lens (Fig 6, 3) and
eyepiece currently in use from the eyepiece
holder (Fig 6, 5) and replace them with
the MicrOcular (PC-Ocular) (Fig 7, 4) as in
illustration 7 in the holders (Fig 7, 5)
nOTe:
Please do not yet connect
MicrOcular and PC. Please
go through the items below in
sequence.
10. Installation and usage of the software
10.1. Installing the software
You find the capturing software for Win 7
/ 8.1 / 10 on the CD. Double click on the
exe file and follow the instructions in the
installation manager. It is not necessary
to install a specific driver. The camera will
be recognized automatically from suitable
Windows operating systems.
10.2. Capturing images
Connect the camera with your PC. Start
the software „CamLabLite“ and activate
the MikrOkularHD in the camera list of the
software. Switch on the microscope and
place a sample with good contrast on the
microscope stage. Look through the eyepiece
and use the lowest magnification to focus
on the sample. Now insert the camera as
described above. Normally only slight re-
focussing is needed to see a sharp image
of your sample in the software preview. The
software preview will always show the full
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