I wonder if these 2 devices would likely work together.
sku: WRL-10153 Description: The RFM22B is a low-cost ISM FSK transceiver module which offers communication at 433/868/915MHz ISM bands and adjustable output power of up to +20 dBm.RFM22B-S2 SMD Wireless Transceiver
http://www.sparkfun.com/products/10153
This Wireless Sensor is Replacement part for 433 MHz wireless fish finder. The Operating Frequency is 125 kHz.
http://cgi.ebay.com/Replacement-Wireless-Sensor-Sonar-Fish-Finder-433MHz-C0-/230562547035