ICES OBI Conference

1
DAtabase TRAwl Survey (DATRAS)
2
introduction

• data
• how are data collected?
• what are data used for?
• what problems should users care about?
• output from database
• data files
• the web page
• data access

3
data collection
HL,1,DEN,DAN2,GOV,001,2004,N,8791030402,059,2 HL,1
,DEN,DAN2,GOV,001,2004,N,8791031301,023,6 HL,1,DEN
,DAN2,GOV,001,2004,N,8791031301,034,2 HL,1,DEN,DAN
2,GOV,001,2004,N,8791031301,038,4 HL,1,DEN,DAN2,GO
V,001,2004,N,8791031301,039,2 HL,1,DEN,DAN2,GOV,00
1,2004,N,8791031801,011,2 HL,1,DEN,DAN2,GOV,001,20
04,N,8791031801,014,2 HL,1,DEN,DAN2,GOV,001,2004,N
,8791031801,015,2 HL,1,DEN,DAN2,GOV,001,2004,N,879
1031801,017,6 HL,1,DEN,DAN2,GOV,001,2004,N,8791031
801,019,2 HL,1,DEN,DAN2,GOV,001,2004,N,8791031801,
021,2
catch by length
sub sample
ALK
4
why data collection

• provide ICES assessment WG with indices
• describe species distribution
• biodiversity studies

5
data
IBTS North Sea (1965) BTS (1994)
IBTS Northern (1985)
BITS (1991)
IBTS Western (2001)
6
IBTS-North Sea
IBTS
30 min
all fish species
GOV
whole NS
IBTS hauls 1. q, 2004
7
data flow in DATRAS
8
standard output tables
Whiting 1. q
NS-IBTS,2004,1,1,44F0,164712,Gadus
morhua,0.02,20.62,5.24,5.63,4.27,2.20
NS-IBTS,2004,1,1,44F1,164712,Gadus
morhua,1.39,27.10,3.31,2.14,0.63,0.40
NS-IBTS,2004,1,1,45F0,164712,Gadus
morhua,0.66,7.65,3.36,4.13,0.51,0
NS-IBTS,2004,1,1,45F1,164712,Gadus
morhua,0.35,22.32,10.99,15.19,3.10,2.01
9
access to data

• www.ices.dk