The present invention encompasses four full length nucleic acid and amino acid sequences for PolyValent Cation-Sensing Receptors (PVCR) in Atlantic Salmon. These PVCR have been named SalmoKCaR#1, SalmoKCaR#2, SalmoKCaR#3, and SalmoKCaR#4. The present invention includes homologs thereof, antibodies thereto, and methods for assessing SalmoKCaR nucleic acid molecules and polypeptides. The present invention further includes plasmids, vectors, host cells containing the nucleic acid sequences of SalmoKCaR #1,2 3 and/or 4.