Table 2.

Overview of different method groups for the investigation of plastic ingestion by polar cod (Boreogadus saida)

Protocol group	Expedition	Number of samples	Stomach content extracted previously	Diet studied previously	Umbrella above sieve	Fibre control
A	PS80	19	Yes	Yes	No	No
B	PS80	13	Yes	No	No	No
C	PS80	17	Yes	No	Yes	No
D	PS92	9	No	No	No	Yes
E	HE 451.1	14	No	No	Yes	Yes