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Human Health Risk Assessment of Mercury in Fish March 2007# j1 G7 ~% n# O7 r
and Health Benefits of Fish Consumption, C$ {! Q& y. y$ R, X. V
With respect to the types of mercury found in fish, both inorganic and organic mercury may be/ V# x! G. M' X' P! {) ?
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical) ~; Z* } F" J* D% K) c
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the7 J+ ?8 \1 q3 {, C- c% W% [% f
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury; H, l# y f. l \
level increasing with age of the fish. In turn, bio magnification along the food chain leads to/ G7 Q6 w+ a$ W- Q. c
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
! Y* E0 i: H- S0 ]- `) ~organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far! }5 W6 A8 _9 |: }; Z; _1 R
lesser extent than methyl mercury.
; L$ C+ R5 Y3 c5 \APPENDIX I
" C& X! T5 s$ `; U5 ~( kSummary data for those samples of fish that were found by the Canadian Food Inspection Agency8 F3 ^4 J% W3 P( g Z
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.' x7 O( V3 ^9 U/ \; U3 C
Samples were collected at the importers= or at domestic processing plants during the periods April 1,; h8 s" A0 t6 c, ~$ r: }0 H. L$ s
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
( j" K5 y. ~- j6 }& a9 x4 gconcentration of zero indicates that mercury was not detected above the analytical detection limit.
3 \7 L8 N/ O7 w! g8 Y. ]Total Mercury Concentration
0 v) u+ [/ h( m8 z9 I9 f) h2 |: \6 g(ppm)
7 N1 \ r( N3 I' E0 u! y/ HSpecies
N$ \& H9 L. ]2 C) d; J/ W8 O2 mNo. of: {5 \+ X2 V- `; ^
samples
1 E# S8 e& `9 F/ H(N) Mean Median Min Max
" Z, d# `; V) ?8 U/ J @$ IAmberjacks 3 0.17 0.14 0.11 0.27
4 R/ C) s; N3 d2 O$ ~8 uBarracouta 1 0.06 0.06 0.06 0.06% T1 y' E$ l6 {" x5 b
Basa 5 0.02 0.02 0.02 0.02
, P" y3 w0 D% S" }3 B, RBullhead, Brown 2 0.09 0.09 0.07 0.1
1 x) A4 \# ~; B m! E# `4 rCapelin 4 0.02 0.02 0 0.058 I6 \" M8 E3 K8 ]4 k) h8 Y
Carp 1 0.1 0.1 0.1 0.1
4 z! m8 g& \- |' x8 N! h yCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
" n N$ @! ]3 e9 f! J& y* lChar, Arctic 5 0.09 0.10 0.05 0.054 V. a8 ^, Q! U3 ]3 D6 U# t8 O/ ^
Clam (various species) 40 0.03 0.01 0 0.08) j& p6 M2 H3 g5 W7 |
Cockle, Greenland 1 0.05 0.05 0.05 0.05
) n+ [# g, X/ Q: r. d1 z( ^Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
% B. S7 P, g0 z0 z2 ]Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
/ Z# J3 L6 ?. |" i" o1 {Crawfish 1 0.1 0.1 0.1 0.13 Z* h! f- `. T
Drum, Freshwater 2 0.22 0.22 0.03 0.41 i6 l4 [ L; o9 u7 [
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
: a3 p- f9 C3 xEel (species not specified) 107 0.24 0.16 0.01 1.70
$ m$ T% p, ~/ J6 p9 ~' k' SFlounder (various species) 22 0.06 0.06 0.03 0.12
1 J# y: ~! f( U/ w/ S) g! B# Z7 j; `Haddock 3 0.05 0.05 0.03 0.07 |
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