The species that is being offered in the email is Gammarus Lacustris an Amphipod, not a true Freshwater Shrimp, as is stated.
As their supplier I find it difficult to see them offered south of the southern MO border. I have stressed that this is not a viable forage for southern climates to all that I sell to but it seems profit is more important to some. While some may survive it would be a waste of money to by these as more than immediate fish food.
They are harvested under the ice here in MN and will not long survive the acclimation into warm water.
As the inventor of the harvest equipment and having handled quite literally billions of these invertebrates for over 14 years I don't recommend purchasing these as a forage base for your ponds if you live south of the MO, AR border unless you understand they will not establish a population.
There are specific water chemistry questions that should be asked and answered before attempting to establish them as a forage.
I turn away requests each year for Gammarus due to water chemistry problems. (I don't believe in buyer beware)Profit is not an excuse to sell someone something they don't need or won't work.
Even here in MN there are ponds and lakes that will not support populations of Gammarus.
ph lower than 7.6
TA lower than 9.00
Ponds that recieve ag runoff or ponds contaminated with chemical residues that remain in the sediment are not good candidates for this invertebrate.
This is an EPA test organism and as such it is hyper-sensitive to any chemical residue.
I also recommend establishing good vegetation prior to stocking Gammarus; Pond weeds (Potamogeton spp.) or Ivy Leaved Duck Weed (Lemna Trisulca) are good choices and will not overtake your pond.
I am finishing a paper on the handling and stocking of Gammarus that should be ready for publication later this year that will be the accumulation of my 14 years of stocking and harvesting knowledge.
Until then I would be happy to answer all inquiries as to the establishing of populations as forage and I may be able to help you find a species present in your climate.
I am not saying this is not a good species to have in your ponds. I am saying there are other considerations before spending that much money.
Barry

What we have done for ourselves alone dies with us; What we have done for others and the world remains and is immortal.