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Human Health Risk Assessment of Mercury in Fish March 2007
5 c0 z9 @8 J9 ]$ o. [and Health Benefits of Fish Consumption" G; I$ ]; g7 F& o; a. L9 |
With respect to the types of mercury found in fish, both inorganic and organic mercury may be3 {, w% y% p# b) x
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
3 \" R+ `# C/ s; \. w& x4 Jproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the3 ~2 Y* c7 g! ?; M# L+ l. i
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
& K- \! i8 r7 l& qlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
2 X5 L. V4 x4 J8 }4 U9 i- h9 Ahigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
1 V% `# p' c" dorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
% r$ j7 j- T& Y5 [* b/ l, ylesser extent than methyl mercury.' S' d, ]5 {7 A0 u! h
APPENDIX I, O2 t8 O" C: a4 e1 A, \+ P3 B. C
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency$ w; c) E; F' ^
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
8 ^9 S T$ r7 p& aSamples were collected at the importers= or at domestic processing plants during the periods April 1,
# }0 w4 H/ w# m' h: F5 _* q. I0 U2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A. S4 J8 u8 R4 w. R4 P4 c+ G' l% q
concentration of zero indicates that mercury was not detected above the analytical detection limit.
4 |. u6 l1 ] s8 rTotal Mercury Concentration% F) A& Y9 `0 C6 z/ N' `7 P7 G
(ppm)
0 D3 `+ T7 ]! Z0 F+ @Species
: R- l0 D' g' z1 iNo. of
. W# Z7 ^9 f$ g& Psamples
5 C, c, C4 A. H2 u, d(N) Mean Median Min Max5 f1 C% ^& U" G8 x; z/ V$ c/ Q5 L) o
Amberjacks 3 0.17 0.14 0.11 0.27
! d; e1 \' }7 S t) I+ Z) kBarracouta 1 0.06 0.06 0.06 0.06
# |+ z) o, m3 Z6 wBasa 5 0.02 0.02 0.02 0.02/ X% r v' d8 t9 \
Bullhead, Brown 2 0.09 0.09 0.07 0.1: ?5 q0 h# [2 T Z" e, I/ u
Capelin 4 0.02 0.02 0 0.05( R% [% M3 x9 A$ X
Carp 1 0.1 0.1 0.1 0.12 R% o% l3 W+ M% b0 T4 ~
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37; n2 I9 J6 S' p) U% U9 s: _+ j
Char, Arctic 5 0.09 0.10 0.05 0.05
3 s2 E" ?, U+ n" H' V- Z/ J6 Z# xClam (various species) 40 0.03 0.01 0 0.08: M$ l( L6 K6 U& Y4 t: d% o3 N
Cockle, Greenland 1 0.05 0.05 0.05 0.056 B3 R7 z% M! X: ?4 Z
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.282 b2 Q3 G# J& E8 h7 o5 \
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37! K1 P9 c3 H: r) x Y. w
Crawfish 1 0.1 0.1 0.1 0.1
0 h3 S; _# S G! y k) d4 gDrum, Freshwater 2 0.22 0.22 0.03 0.40 r- ^( M+ T! X# P
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.767 l# ?( e' c) U) P0 K
Eel (species not specified) 107 0.24 0.16 0.01 1.70, ^' e- j4 Y2 t! Y7 O' a. L2 l
Flounder (various species) 22 0.06 0.06 0.03 0.12
* K6 ]/ V% B5 [8 _ b. B" }Haddock 3 0.05 0.05 0.03 0.07 |
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