These data were recorded by a Spanish survey, as part of a multi-country survey of the abundance of mackerel eggs off the coast of north-western Europe, in 1992.
The variables are:
Density | egg density |
smack.lat | latitude of sampling position |
smack.long | longitude of sampling position |
smack.depth | bottom depth |
Temperature | surface temperature |
D200 | distance from the 200m depth contour line |
Background to the survey and the data are provided by Watson et al. (1992), Priede and Watson (1993) and Priede et al (1995). Borchers et al (1997) describe an analysis of the data.