I doubt taking them out alive will be very effective.
When you give up on the kinder-gentler approach...
The Conibear 110 traps, as mentioned, will be what you are looking for to get the job done. I highly recommend using the Stabilizer brackets with them for proper placement and best results (see below).
https://www.amazon.com/Deep-Water-B...071V94QR4/ref=psdc_3413451_t2_B071KX7FB5This time of year, the water level should be low enough to expose the runways and entryways into the banks. Just place the Trap/bracket directly in their way.
