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Human Health Risk Assessment of Mercury in Fish March 20070 D" H& c% O6 q; a: W
and Health Benefits of Fish Consumption$ W% J" ?; ~7 N8 D- C2 o* P& U
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
4 C1 `( y( K& Y6 Vpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical; A$ |& R3 ?6 n
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the7 } {! }+ u, d; d
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury. s# K" S+ p! |! G& r5 Y e
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
) H+ z9 Z( [; ^higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
8 Q+ r7 p1 A3 J4 } o3 T/ w$ @organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
# g; q4 l6 P( g# q' ylesser extent than methyl mercury.+ k, n; E% L8 a
APPENDIX I
$ @$ S7 D: M4 F; tSummary data for those samples of fish that were found by the Canadian Food Inspection Agency1 y2 k- n6 G% z2 m% _+ J
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury." j* I S7 ^, r9 A
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
5 O! ]6 y& V5 x2 A K* t2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A% e' j9 [4 @: n j7 [" G/ y
concentration of zero indicates that mercury was not detected above the analytical detection limit.
, }& p9 K( a- |6 n1 g' E! l6 X4 vTotal Mercury Concentration
+ `$ N0 {2 C1 s8 y3 J(ppm)( E& C8 U2 x- ^3 f
Species
0 I3 _) o5 H% V/ MNo. of3 `" N$ Q! W* {+ J7 M+ q
samples" E3 z5 z6 F1 r6 m3 M6 r) l9 Y
(N) Mean Median Min Max) g" P- t+ x! L l1 M) Y
Amberjacks 3 0.17 0.14 0.11 0.27
- @) b$ |, R* d, X* R4 w0 y8 M7 N4 nBarracouta 1 0.06 0.06 0.06 0.06 O+ B: X% Q9 q; z* {
Basa 5 0.02 0.02 0.02 0.02
Q8 @- e, l/ CBullhead, Brown 2 0.09 0.09 0.07 0.16 c9 |& ^2 h# X. ~
Capelin 4 0.02 0.02 0 0.05
8 @9 }, L# e6 u: yCarp 1 0.1 0.1 0.1 0.1 {, @+ }' e" z4 f
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
/ ?/ v7 k) M- a* V, {% W c4 K, N4 ] aChar, Arctic 5 0.09 0.10 0.05 0.059 r* Y3 F' T/ B6 T P
Clam (various species) 40 0.03 0.01 0 0.08) S9 K4 {3 G2 s
Cockle, Greenland 1 0.05 0.05 0.05 0.056 s- W h9 D- g3 U
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28. B1 F/ ?0 v, S. F X& K
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
& T3 o- M3 I8 R F3 y3 f, ^5 @Crawfish 1 0.1 0.1 0.1 0.11 |, w: L* ?& _$ ^6 [1 z
Drum, Freshwater 2 0.22 0.22 0.03 0.4! B* j5 T! @# q9 g5 J
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
# R( \# u% P2 B" nEel (species not specified) 107 0.24 0.16 0.01 1.70
* F( N7 n1 e3 Q' J! c! j7 B$ K# qFlounder (various species) 22 0.06 0.06 0.03 0.12
3 B2 |/ ^( |+ j3 i' tHaddock 3 0.05 0.05 0.03 0.07 |
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