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Human Health Risk Assessment of Mercury in Fish March 20071 o# R1 K6 I. X$ l# y
and Health Benefits of Fish Consumption4 F! J" d" V) c; \$ d/ @ M6 S$ B
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
- m7 D: A( R1 \) Fpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
* V z% T, Z }; x5 A% L% g& jproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the" G) q4 S/ Z5 S. z9 ]1 z1 y
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury" L& N# a/ |% i% w% g9 H$ K
level increasing with age of the fish. In turn, bio magnification along the food chain leads to4 ]% ? p) h* D% d" ^
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
3 B+ q/ j0 Y i. eorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
* S' g, O" p6 p4 n, i, i8 a- _lesser extent than methyl mercury.
6 P6 M8 y( c |$ ?& RAPPENDIX I
/ R8 J0 f! Q$ [Summary data for those samples of fish that were found by the Canadian Food Inspection Agency4 v" f2 c) k5 Y& N8 x
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
# f) ~% j3 U; |/ c2 m% o K, F. ySamples were collected at the importers= or at domestic processing plants during the periods April 1,8 h+ ?0 H$ l1 X6 l- O+ N1 \$ n
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A0 C6 }" Q5 B$ m
concentration of zero indicates that mercury was not detected above the analytical detection limit.! n) P8 E$ z( x1 z. h
Total Mercury Concentration2 H: r9 A5 P4 x2 ]7 V# L2 v
(ppm)3 U( [8 t! }9 m# G( ?2 h7 Q) `* i
Species
' R1 Z' t% M; c; G& k. y# c' oNo. of% b+ @7 Q+ F- V, I* J* R7 i
samples
2 g3 ^9 N V H6 g" m(N) Mean Median Min Max, q1 j8 D! |8 R' P* x( g2 I
Amberjacks 3 0.17 0.14 0.11 0.27/ L9 N2 M$ d H" ^$ j5 _
Barracouta 1 0.06 0.06 0.06 0.060 e4 R- R! F- }
Basa 5 0.02 0.02 0.02 0.02 u4 V H; d4 m9 P! J
Bullhead, Brown 2 0.09 0.09 0.07 0.1
- v6 S0 h9 j% Q/ GCapelin 4 0.02 0.02 0 0.05
3 j2 S6 f Y+ x* r# ^* tCarp 1 0.1 0.1 0.1 0.1
0 j* [: L0 G5 H- zCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
4 d5 s7 Y% p, F" t6 a; aChar, Arctic 5 0.09 0.10 0.05 0.05; u: e: |" R$ R) ]2 b9 X) I
Clam (various species) 40 0.03 0.01 0 0.08( b7 t$ l9 z7 d3 Q: |; s6 b
Cockle, Greenland 1 0.05 0.05 0.05 0.05
& a) e5 F# `5 V9 [0 E; L; JCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
% m% [* P- U* z' \ dCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37; T; N2 T d2 a% y) s
Crawfish 1 0.1 0.1 0.1 0.1
' @4 r, }; k; C' U5 i4 MDrum, Freshwater 2 0.22 0.22 0.03 0.43 ]/ O+ \& K% \ k& S$ r
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
" L! [$ o: \- r% j& O7 LEel (species not specified) 107 0.24 0.16 0.01 1.70
" d( n' s+ z* _- O+ Y- v. BFlounder (various species) 22 0.06 0.06 0.03 0.12
, ^4 e( B {5 u3 pHaddock 3 0.05 0.05 0.03 0.07 |
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