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Human Health Risk Assessment of Mercury in Fish March 2007
$ L0 w$ l! y% X2 a' [and Health Benefits of Fish Consumption2 \0 \+ B- W$ d# [0 W/ F8 a9 m
With respect to the types of mercury found in fish, both inorganic and organic mercury may be t1 N5 R0 n4 B8 ?) r% s
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
( x8 ?7 Q+ q ?& ?properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
Q% W) C" N. Bproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
4 v9 g& t: d' {! |, @! t' Alevel increasing with age of the fish. In turn, bio magnification along the food chain leads to/ M' o: d8 \0 {( s8 e6 K. `
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
+ ]- E4 p4 }( x9 |/ Zorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far5 Z9 J |- t# b( G# U8 S& G0 I' e
lesser extent than methyl mercury. T0 L m: ?' D
APPENDIX I
; f4 s$ k+ \5 ySummary data for those samples of fish that were found by the Canadian Food Inspection Agency' U/ H l3 Z0 t5 \/ k7 |
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury. S, ]( v1 O3 \1 o
Samples were collected at the importers= or at domestic processing plants during the periods April 1,8 Q9 o: Q5 p! n ^1 i6 v J
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A& k0 m; n: @) v2 X) H, B
concentration of zero indicates that mercury was not detected above the analytical detection limit.5 \. c7 }: F/ l4 l
Total Mercury Concentration
# h3 z+ {2 y# ~; D B/ s(ppm)
+ d( w9 C9 x- ~! M. e) MSpecies6 U) n. a! R2 n. F1 L2 S
No. of
3 w" ?/ B5 y3 k5 M) W( Tsamples, A/ N! V6 Z3 c Q1 u& f; k
(N) Mean Median Min Max/ m4 O7 z) \% @- M1 ?3 k
Amberjacks 3 0.17 0.14 0.11 0.271 G; T7 z: V W7 d, k
Barracouta 1 0.06 0.06 0.06 0.06& `0 ?/ d+ S' f4 V+ a+ Z. \
Basa 5 0.02 0.02 0.02 0.02
' Z0 F2 f: C) KBullhead, Brown 2 0.09 0.09 0.07 0.1( B" U* e1 a; P! H
Capelin 4 0.02 0.02 0 0.05
+ C. y% `" j0 h) f6 \) gCarp 1 0.1 0.1 0.1 0.1% w( `; c: b3 \; r2 w. f3 t
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
5 j% M$ r* z% V) nChar, Arctic 5 0.09 0.10 0.05 0.05( w) q+ ^9 h" {5 F
Clam (various species) 40 0.03 0.01 0 0.088 i/ U/ F* @# \/ {+ x9 ^' g- H; e
Cockle, Greenland 1 0.05 0.05 0.05 0.05
/ `" u" Y" d5 T ?' L. jCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.280 C S# j a; ^' K& @6 e1 W
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.378 O# l( y- k) b; A/ u
Crawfish 1 0.1 0.1 0.1 0.1
# ]; x( C" u5 J' ADrum, Freshwater 2 0.22 0.22 0.03 0.40 y, Y0 @' S& C* u( ]3 G
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76) {7 f6 `- i c# q& ?3 m
Eel (species not specified) 107 0.24 0.16 0.01 1.70
* G8 V. O0 ?4 o0 b$ }4 x) @Flounder (various species) 22 0.06 0.06 0.03 0.12 m7 g* ]$ p" C# k0 x- `
Haddock 3 0.05 0.05 0.03 0.07 |
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