Very interesting article on Atlantic salmon in April Smithsonian magazine. One thing I did not know before is that they spawn in fall, and eggs hatch in spring. When they are very small, they are called fry. A bit larger, they are called parr. When the parr turn silver they are called smolts.The smolts go to sea, which requires a change in their kidneys. After they have been in sea a year, they are called grilse.