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Opossum shrimp

A small , up to 1 cm shrimp. Mysis Relicta is a freshwater species,
imported from the USA. In the Netherlands its found in brakkish water.
Mysis mixta can be found in the Baltic Golf.
Although called a shrimp it's in fact a more primitive relative of the
nowaday shrimp found in the sea's and oceans, like the common shrimp.
Mysis feed mostly on algae, like diaptoms, and in May this is the
most important source of food. But they also feed on bloodworms
and other creatures that live on the bottom of the ditch.
At night they can be found near the surface. at daytime they
live near the bottom.

Mysis relicta

Some mysis relicta together, these photo are made by
Jaap Cost Budde, have a look at: Flickr

Mysis, with even more details.

Mysis as a living food

Mysis can be used as a living food source for saltwaterfish
(especially seahorse and Pipefish
and lower saltwater animals, like anaemonen, shrimp, fishes
and insects that live in brakkish water. In freshwater they
are also hunted by salamander and fish.
. In aquaria, mysis is mostly used as frozen food. Seahorses
typicaly eat 6 of them a day
Mysis is very good food for saltwaterfish as:
- its high in fat, and contains different kinds of fat
- its low in phosfate (or has a high N:P ratio), so can be
used to reduce the phosfate level, important if youre
aquarium is suffering from blue algae.
This can occur when the N:P ratio in the aquarium is lower
then the Redfield Ratio.
-its low in salt, so fish don't have to uses much energy to pour salt out
of theire body.

Mysis in brakkish water

Mysis form groups in the brakkish water aquarium . They have unique
feeding habits that differs between day and night:
At day time they stay near the bottum eating mostly
detrusis and algae. At night they get to the surface
hunting on plancton, rotifers, daphnia, so largely
as a filter-feeder.
One can feed them with koikarper fish-pallets, but almost
everything will do the job: Artemia , bloodworms, daphnia can be given.

Mysis lives together with the Atlantic shrimp that can
be found in the mud of the ditch, and they are both hunted by
Ten-spined Stickelback and Three-spined Stickelback

Mysis is een groepsdier
Mysis lives in groups.

mysis,samengesteld oog
Mysis, the eye,
200x, living.

Mysis, a dime-size crustacean,
here seen in live seize


    Originally they used to live in the northern parts of Europe and
    America. But are introduced in the Usa and middle Europe.
    In holland they now live in the brakkish water between the harbour of
    Amsterdam and the sea (het Noordzee kanaal).

    Mysis contains the highest amount of protein in living found
    and also a large amount of fat.

    Mysis gracilis, anatomie

    Vertical migrations of mysis

    Mysis Relicta, Mysis Mixta and Neomysis Integer are all living in the Baltic Golf
    They all do have an vertical migrations: at daytime they feed on the bottom
    feeding on detrusis and nematodes and avoiding fish, at night they transfer to upper
    layers, hunting for zooplancton. Mysis is different of this zooplancton: it lives longer,
    about two year, zooplancton lives for some months. And its bigger ,1cm normally.
    (as described by Ilmar and Jonne Kotta, 2001).

    Mysis lives in groups


    Breeding mysis is not very difficult, and I have a large amount of
    these lovely creatures swimming around. Some rule-of-thumbs are:
    - salanity or amount of salt , keep this between 1003-1010 =light brakkish
    and use (of course} seasalt.
    Use oxygenbubble blocks wich produces large bubbles, as mysis, as all the
    shrimp can stick on small bubbles. Keep the water moving!


    Mysis is fun to look at under a microscope

    mysis ,kop
    mysis ,head and antennae, 60x, alive

    Vestibulair organ

    Mysis has a little organ under its telson (tail) called a statocyst
    ,a little stone in a space filled with fluid.
    In this way the mysis knows what's up and down.
    Mysis gracilis, anatomy

    How to catch mysis

    Mysis can be catched using a net in canals with brakkish water
    near the sea. Mysis can be found near the surface at night,
    during the day they sink deeper, but always near the border
    of the canal. They canm be given as living food directly ,but
    mostly froozen and stored.,br> visitors Dutch Dutch | | © copyright waterwereld 2002-2025 | home | links

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