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Yeah, it's unfortunate fishmosy isn't active anymore. He has a lot of knowledge that would have been useful. However, I would suggest you give it a go. Build a tank specifically for the shrimp you manage to catch. When you do succeed in catching some, make a note of the location and date. If you are ever successful enough to release any, you have a record of the location. Also bring your test kit to check on the water parameters where the shrimps were caught. Test pH, temperature, GH, KH, TDS. Those are the key ones. Make sure your tank parameters match this water exactly, as wild caught shrimps will adapt better if the parameters match. Start collecting rain water in plastic rain water tanks. You're going to need it for water changes. Don't even consider using tap water.

Tell us what is wrong with your shrimp and give us as much details about your water parameters as possible.