Effective, but I'm afraid it's only a short-term solution. A comprehensive neutering program should be considered.
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I am proud to report that a successful rescue took place at ginnie (to my knowledge a first). A river crayfish was rescued from ginnie. There was a bit of panic as I was repeatedly pinched on exit but once a shore all was calm and the crayfish graciously allowed a photo shoot prior to his release back into the daylight river environment (pictures to follow when they are ready).
On another note observed a large dead catfish in the white room today and he had attracted a ton of the indigenous sante fe river crayfish who were feeding away. The river water is not in the white room as of today but the big dome at double domes is still full of it.