meh: Data from 2010 horse mackerel and mackerel egg survey
In gamair: Data for 'GAMs: An Introduction with R'

Description Usage Format Details Source Examples

The data relate to the distribution of horse mackerel (meh, Trachurus trachurus) eggs and mackerel (med, Scomber scombrus) eggs and were collected as part of the 2010 mackerel survey aimed at assessing the mackerel spawning stock biomass using the daily egg production method.

1 2	data(med) data(meh)

A data frame with the following columns. Each row corresponds to one sample of eggs.

count: The number of stage I eggs in this sample.
la: sample station latitude
lo: sample station longitude
vol: volume of water sampled
T.surf: surface temperature in centigrade
T.x: temperature at x metres depth.
T1.x: Second temperature measurements.
Sal20: Salinity at 20m depth
b.depth: seabed depth in metres for med only.
lon: The longitude of the sample station in degrees east.
lat: The latitude of the sample station in degrees north.
time: The time of day (in hours) at which the sample was taken.
salinity: The salinity (saltiness) of the water at the sampling location.
period: sampling period
country: Country responsible for sample
ship: Vessel ID
DT: sample data and time
ID: Sample ID
gear: type of sampling gear used

The remaining fields are undocumented.

The original data files do not always exactly match the file documentation, so these data should not be treated as definitive.

ICES Eggs and Larvae Dataset 2012, ICES, Copenhagen

http://www.ices.dk/

http://eggsandlarvae.ices.dk/Download.aspx

require(gamair)
par(mfrow=c(1,2))
data(meh);data(med);data(coast)
# plot the egg counts against location
plot(meh$lo,meh$la,cex=0.2+meh$count^.5/10,col="grey",
     pch=19,xlab="lo",ylab="la",main="horse mackerel")
ind <- meh$count==0
points(meh$lo[ind],meh$la[ind],cex=0.1,pch=19)
lines(coast)

# same for med
plot(med$lo,med$la,cex=0.2+med$count^.5/10,col="grey",
     pch=19,xlab="lo",ylab="la",main="mackerel")
ind <- med$count==0
points(med$lo[ind],med$la[ind],cex=0.1,pch=19)
lines(coast)