Abundance of juvenile Atlantic cod (Gadus morhua) in the shallow rocky subtidal and the relationship to winter seawater temperature

Abstract

Two inshore rocky subtidal sites on the west coast of Scotland (Saulmore Point, Firth of Lorn, 056°27′N 005°24′W and Davy's Rock, Firth of Clyde, 055°46′N 004°53′W) were surveyed for the presence of juvenile (0+) Atlantic cod, Gadus morhua between September 1995 and November 2001. A total of 951 juveniles were recorded at Saulmore Point and 34 at Davy's Rock. At Saulmore Point the abundance was highly seasonal, being observed between June and December only. Juveniles were present in only three out of six survey years, with a maximum abundance of 0·89 individuals m⁻² recorded in 1996. Maximum abundance of juveniles at Saulmore Point was negatively correlated with winter seawater temperature, indicating that winter temperatures may be a useful indicator of subsequent juvenile abundance levels in inshore habitats.