818
RADIONUCLIDES IN MARINE PROTEIN CONCENTRATES
Table 3. Trace element concentrations in fish protein concentrates
Sample
Menhaden
(Breveortia
iyrannits)
Menhaden
(Brevoortia
hrannus)
Menhaden
(Brevoortia
lyrannus)
Menhaden
(Bretvoortia
tyrannus)
Ocean Pout
( Afacra zoarces
americanus)
Alewife
(Alasa pseudo
harengus)
Gulf Menhaden
(Bretoortia
patronus)
Anchovy
(Engrautis
mordax)
Atlantic herring
(Clupea harengus
harengits)
Location
also
ratios
measured
Trace element concentrations (ug/g dry wt. ppm)
——
———
Pb
Ag
Cd
Gu
Co
Fe
Yn
Mn
Chesapeake
Bay
june, 69
0.8
1.3
1.0
54
4.6
346
124
Chesapeake
Bay
June, 69
1.0
1.3
1.0
66
16
492
128
33
Chesapeake
jay
June, 69
1.0
10
0.8
5.6
1.1
614
131
64
Chesapeake
June, 69
1.0
1]
0.8
7.5
1.5
403
126
53
Mass.
Coast
Jan., 69
0.3
1.9
Ll
6.5
63
254
93
9
Lake
Michigan
April, 69
0.7
1.0
1.0
66
1.7
123
170
2)
Miss.
Coast
May, 69
2.3
1.5
1.0
53
1.6
860
142
64
South
California
Coast
Mass.
Coast
Jan., 69
8.2
1500
2.30
11.7
1.1
373
143
12
Nov., 68
0.5
0.9
0.6
8.4
1.2
116-110
10
Bay
are in fam agreement with this ratio.
has
Catch
date
the 7!8Po/?©Pb
in zooplankton,
Shannon
activity
and reports a mcan
value of 12. ‘Lhe pooled stomach contents
of our anchovy specimens had a mean 7!°Po/
“0P}) activity ratio of approximately 12, again
in good agreement with Shannon’s findings, if
we assume the stomach contents of the anchovy
represent zooplankton residues.
The same high #Po/719Pb ratio was obscrved
lor the internal organs of the saury, ‘The stomach contents, however, showed a marked in-
crease in this ratio, as a result of higher “Po
concentrations. Unfortunately, identification
of their stomach contents was not possible and
we therefore cannot assign this higher rauo to a
parucular marine entity.
‘he data in ‘Pable 2 suggests that, at least in
the case of Pb, "Pb and 728Po, evisccration of
the fish prior to processing would aid in reducing
the concentrations of these entitics in the final
4]
product. It is not possible to assign an absolute
value for the anticipated reduction, for the
weight fraction which each organ contributes
to the total fish weight is only poorly known for
different fish specics.4)
TRACE ELEMENT CONCENTRATIONS
Table 3 lists the concentrations of trace elements which were measured in these FPC
products. The numberof trace clements which
are included is not exhaustive, and clearly there
are linportant clements missing, lor example,
Se and As concentrations would have been
informative, as would the concentrations of
Mo, ‘Ti, Si, B and Ni. We chose the trace
clements shown in ‘Vable 3 because several are
considered toxic in moderate amounts (Pb,
Ag, Cd, Cu) while others, in small amounts, arc
essenual to good nutrition (Co, Fe, Zn, Mn)."”?
The high concentration of Pb in the anchovy
¥PC is consistent with the findings shown in
pop REC"
coe