17
EN
The Incubation of the Brine Shrimp
In order to incubate the shrimp, you first need
to create a salt solution that corresponds to the
living conditions of the shrimp. For this, put a
half liter of rain or tap water in a container. Let
the water sit for approx. 30 hours. Since the wa-
ter evaporates over time, it is advisable to fill a
second container with water and let it sit for 36
hours. After the water has sat stagnant for this
period of time, add half of the included sea salt to
the container and stir it until all of the salt is dis-
solved. Now, put a few eggs in the container and
cover it with a dish. Place the glass container in a
bright location, but don’t put it in direct sunlight.
Since you have a hatchery, you cal also add the
salt solution along with a few eggs to each of the
four compartments of the tank. The temperature
should be around 25º. At this temperature, the
shrimps will hatch in about 2-3 days. If the water
in the glass evaporates, add some water from the
second container.
The Brine Shrimp under the Microscope
The animal that hatches from the egg is known
by the name “nauplius larva.” With the help of a
pipette, you can place a few of these larvae on
a glass slide and observe them.
The larvae will move around in the salt water by
using their hair-like appendages.
Take a few larvae from the container each day
and observe them under the microscope. In
case you’ve hatched the larvae in a hatchery,
simply take off the cover of the tank and place
the tank on the stage.
Depending on the room temperature, the larvae
will be mature in 6-10 weeks. Soon, you will
have had raised a whole generation of brine
shrimp, which will constantly grow in numbers.
Feeding your Brine Shrimp
In order to keep the brine shrimp alive, they
must be fed from time to time, of course. This
must be done carefully, since overfeeding can
make the water become foul and poison our
shrimp population. The feeding is done with dry
yeast in powdered form. A little bit of this yeast
every second day is enough. If the water in the
compartments of the hatchery or your contain-
er turns dark, that is a sign that it is gone bad.
Take the shrimp out of the water right away and
place them in a fresh salt solution.
Warning!
The shrimp eggs and the shrimp are
not meant to be eaten!
Textile fibres
Objects and accessories:
1. Threads of different textiles: Cotton, linen,
wool, silk, Celanese, nylon and any others
you can find.
2. Two needles:
Put each thread on a glass slide and fray each
with the help of the two needles. Put a drop
of water over each thread with the pipette and
cover each with a cover glass. Adjust the mi-
croscope to a low magnification. Cotton fibres
are of plant origin and look, under the micro-
scope, like a flat, twisted band. The fibres are
thicker and rounder at the edges than in the
centre. Cotton fibres consist primarily of long,
collapsed tubes. Linen fibres are also of plant
origin; they are round and run in straight lines.
The fibres shine like silk and exhibit numer
-
ous swellings along the shaft of the fibre. Silk
is of animal origin and consists of solid fibres
of smaller diameter than the hollow vegetable
fibres. Each silk fibre is smooth and even and
has the appearance of a small glass rod. Wool
fibres are also of animal origin; the surface
consists of overlapping scales, which appear
broken and wavy. If possible, compare wool
fibres from different weaving mills, and note
