Gammarus, Scuds

4.00 out of 5 based on 1 customer rating
(1 customer review)


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Product Description

Gammarus, also known as Scuds, is a shrimp-like crustacean. It is an easy to culture live food that is an excellent size for many larger tropical fish. Even adult guppies can eat scuds. Cichlids and many killifish love them. This crustacean reaches about 1cm (0.4 in.).  This shrimp-like, freshwater crustacean lives on decaying plants and detritus also eating algae and other microorganisms. It is gray to green in color. There are various species in North America, Europe and Asia.

This live food species is an excellent live food for most large tropical fish. It has the advantage of surviving aquarium conditions indefinitely so that it can be fed in abundance without fear of water fouling (do not, however, feed too many without adequate aeration since this organism will compete with fish for oxygen) .hTis species survives happily in aquarium quality water. It can tolerate temperatures as low as 0°C (32°F) and high as 35°C (95°F) but prefers temperatures ranging from 20-30°C (68-86°F). pH is not important. Culture containers (the author prefers 32 gallon plastic trash cans, preferably yellow or white colored) should be aerated and provided a good food source, such as plant cuttings or tree leaves.

Culturing scuds is simple in any container that can hold water. The author uses plastic garbage cans. Culture instructions follow:

1) Fill a plastic garbage can or an aquarium with aged water. Place about 5cm (2 inches) of dried leaves. Most tree leaves are good, but you should avoid oak leaves. Dried mulberry leaves are excellent. Place the container is a sunlit location. Aerate the water lightly. Scuds can survive winters outside in most of North America, but reproduce best at 20-30°C (68-86°F).

2) Add a starter culture of Gammarus; a few dozen will be enough.

3) Scuds feed on rotting leaves and microorganisms take grow on any surface. Provide adequate surface area to increase the population size by placing rolled up plastic screening in the culture container. The author uses plastic coated water cooling pads.

4) Within four weeks there will be enough scuds to harvest. Harvest by netting them with a fish net or by picking up the plastic screening or cooling pads and shaking over a bucket.

5) Feed the culture with additional leaves as they are consumed or decompose. Periodic, partial water changes are beneficial.

6) Cultures are long-lasting and sub-culturing is necessary only when production declines. Nevertheless, it is wise to maintain a replicate culture in case of a disaster (the author has lost outside cultures to neighbor’s herbicide poisoning).

Our starter culture is approximately 1000 Gammarus.



1 review for Gammarus, Scuds

  1. 4 out of 5

    (verified owner):

    I have been ordering/growing Scuds for sometime now and every once in a while i add a new batch to the mixture to freshen things up, but prices are ridiculous.

    This, by far, is one the cheapest people i have ever met and i was very worried ‘You get what you pay for’ would bite me in the butt, so here is my review:

    I ordered 2000 Scuds for $60 + shipping and easily got more then that, the issue i had is you can tell they just scoop whatever is in their pond into the bag, and hiding in the layer of soil on the bottom was pond snails, panaria and mosquito larva, plus whatever hasn’t come out of hiding so far. For me this inst an issue since i have a Scud tank and i dont care if it gets over run by pests and since none of those are harmful to my fish they just add to the value, more things to reproduce!

    Also. i ordered some some Naja grass for my scud tank for $15. What i recieved was extremly above my expectations of how much i would get, it was a crazy amount and i dont know what to do with it, but, once again we had a lot of carry ons including a CRS (Crystal Red Shrimp) and a dead guppy.

    Overall I’m happy with the product and will order from the company again, just wish they put more of a heads up about the extra passengers!

    • :

      Our scuds are raised indoor in vats in our recirculating system, which is an ecosystem. We place “gunk” from the bottom of the vat in the bag along with some hornwort to provide food and cover for the scuds because they seem to ship better that way. Planaria, which can’t survive in fish vats because they are eaten, are unavoidable in rich vats. Pond snails? Probably. Like I said it’s an ecosystem. Mosquito larvae I’m surprised about since the vats are aerated and have water flowing in continuously causing lots of water movement. Mosquitos don’t like to lay egg rafts in moving water.

      The guppy was a mistake. The vat I took the Najas from also houses Red Cherry Shrimp. I didn’t bother to purge them except by a quick shake.

      I’m glad that you are happy overall. In order to keep costs, and therefore prices, low, we can’t exclude some “extra passengers.”

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