• Caridina Japonica breeding

    Breeding Caridina multidentata / Caridina japonica

    by Dmitriy Migay (Ukraine), used by kind of permission for N. Gera

    Many shrimp keepers have already tried to capture breed Yamoto or Amano Shrimp larvae.
    However, I will share my experience on it. Here is what you need:

    1) 10 liter tank
    2) special marine salt
    3) hydrometer and/or refractometer
    4) drip kit
    5) 1 liter container or cap
    6) lighter
    7) heater (optionally)
    8) syringe 5 and 20
    9) flash-light (lantern)
    10) precise scales
    11) Amano shrimp: males + females
    12) shrimp food „Mosura Shrimpton”
    13) air pump

    When one day you see a female Amano shrimp berried with eggs for the first time – mark that date
    in your calendar. My Amano shrimp was berried 25-27 days at a temperature of 26-28° Celsius.

    Water treatment
    While the female Amano carries her eggs, we I prepare the water for the larvae tank. I have used
    SEACHEM AQUAVITRO SALINITY + RO Water for this. Heat the RO water up to 40°C, and
    the salt will mix easier. Target a salinity of 35 ppt. By adding RO water for the evaporated water,
    we can easily keep the salinity at 35 ppm on the long run. Each week, add 1/3 spoon of Mosura
    Shrimpton, this will make your water turn green, and algae grow.

    Eggs and larvae catching
    Look attentively at the eggs under the female’s belly – when they are almost ready, they are
    light and you might see the black dots of future eyes. Better put the berried Amano in the
    separate freshwater tank without fishes and install an air-driven sponge filter. After 15-17 days
    of pregnancy, I started to catch the first newborn larva, until the main larva swarm was born.
    Releasing all larvae can take 1-3 days.
    Put the female Amano shrimp back into your origin tank, when she released all eggs. When you
    first see the larvae, dim lights for 24 hours and remove the filter. Don’t start catching them at once.
    Follow this hint! They swim to the light, so you better wait for the night, take a flashlight, put the
    scoop into the water and wait till these 1.8 mm creatures get in. You can simply drop them into
    the prepared salt water, and will not suffer from rapid environment change. You have 6 days after
    hatching to catch the larva and transfer them to the salt water.

    Larva keeping
    Larvae swim heads down, and eat almost all the time. To say briefly, the hardest time to keep

    them alive is the first 12 days. For 12 days you must keep the water quality very good, and
    handle carefully. Feed them Mosura Shrimpton – this food showed good results until the final
    metamorphosis. You need to feed 5-6 times a day. I used 1/3 spoon per 2 ml of water and add it
    by syringe. I strongly do not recommend yeast as food! Another very important point is: You must
    shade the sides of the tank; so larvae can sit and feed from the sides of the tank in the daytime.
    Plankton food is very good for the little shrimp; alas don’t remove any natural green algae from
    your tank.

    Tank maintenance
    Keep the temperature 24°C!
    Use 6 liters of water for larvae within the first 12 days. Don’t do water changes during this period -
    after 12 days you can add some fresh salt water.
    Then do water changes with 2 liters every 4th day.
    Do not clean the tank sides. Do not siphon to clean the bottom.
    From the old water you remove, catch any larva with the flashlight method.
    During 12 days keep the salinity at 34-35 ppm, from day 13 it is also okay with 30-35 ppt.
    You should also make a chart with waterproof markers indicating units of 200 ml (200, 400, 600,
    800, and so on).
    Do not add RO water all at once, as it can decrease salinity. Please check the salinity first and
    make sure it never gets lower than 30 ppt. When you remove bacterial film from the water surface,
    use the flash-light from the bottom of the tank at the same time.

    I’ve seen my first “post-larva” shrimp after 22 days. They started losing their interest to light than,
    and swum quicker as before. They turned from transparent to brown and grew bigger (approx. 8
    mm). It is when they cannot tolerate salt water for a long time then. The metamorphosis process
    starts not simultaneously, and lasts 30 days.
    I have caught the post-larva when they were sitting on the sides of the tank near the light beam of
    the flash-light. My ‘weapon’ was kind of a scoop or the syringe (without the rod). Then I put them
    to the container with 300 ml of salt water. After the post-larva finished its transformation (it takes
    2-4 days), I started adding the freshwater from the main tank to lower the salinity down to 25 ppt.
    I didn’t feed them during the transformation. Catch the post-larva every second day and you will
    never mix the ready-developed and not-ready developed within one container.

    Transfer to freshwater
    When the post larvae change coloration to transparent, you can prepare the little shrimps for
    freshwater tank.

    (translated by Gera and Imke)
    This article was originally published in forum thread: Caridina Japonica breeding started by gera View original post