A scientific name for a Salmon is called "Salmonidae".
The scientific or taxonomic name would be Salmo salar.
The scientific or taxonomic name would be Oncorhynchus nerka.
The scientific or taxonomic name would be Oncorhynchus masou.
The scientific or taxonomic name would be Oncorhynchus gorbuscha.
The scientific or taxonomic name would be Oncorhynchus tshawytscha.
The scientific or taxonomic name would be Oncorhynchus spp.
The scientific or taxonomic name would be Oncorhynchus rhodurus.
The scientific or taxonomic name would be Oncorhynchus masou.
The scientific or taxonomic name would be Oncorhynchus nerka.
The 'standard' pacific salmon are from the family Salmonidae and the genus Onchorhynchus and its called Oncorhynchus tshawytscha
Although typically we refer to it as a scientific name, chemical name is wholly appropriate. The name is Salmo salar.