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Human Health Risk Assessment of Mercury in Fish March 2007
- s2 Q+ f" w7 T$ B( J$ V7 land Health Benefits of Fish Consumption a% I7 q9 j/ T2 J6 C& U& P; N
With respect to the types of mercury found in fish, both inorganic and organic mercury may be$ f) [7 m' b1 k+ [2 O; @
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical; _. ^$ d- Q) T7 _, u& I4 K, \# E
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
+ o( N8 a" F7 q5 Sproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
. H$ M% t2 q/ Z( f( Flevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
) q6 Z. |3 G# }( b3 H1 N6 Xhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
- w% b( f+ n& dorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
7 | Q) k1 |0 g/ _: f0 K) _! ^$ ^lesser extent than methyl mercury.
* m* A0 P* W; S5 |0 _APPENDIX I4 G" n7 ^, A7 i+ n( a! m
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
+ Y y |- r9 C7 R5 c(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.0 x& F) ^6 b% R: F! P/ x: S j
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
3 S v- j' L5 v8 O; ], ?! `" x2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A* j9 b3 O$ S: ~% f( b6 f4 T
concentration of zero indicates that mercury was not detected above the analytical detection limit.
1 u7 Q9 }5 q7 Y9 FTotal Mercury Concentration+ v7 Z2 X/ ~' G1 s2 O; }
(ppm)
' D, t5 y2 X2 |Species
( D. @( [7 P5 k" F$ w0 i" yNo. of
5 T' H, s" `8 Qsamples$ N9 A( Z N! g, y. i) a" X
(N) Mean Median Min Max
8 k' h2 s' E, ^! Y3 B" {: U6 e9 XAmberjacks 3 0.17 0.14 0.11 0.27
% q1 g# w) H1 |$ |Barracouta 1 0.06 0.06 0.06 0.06) r7 A6 e/ [* t2 _/ N
Basa 5 0.02 0.02 0.02 0.023 G' T8 }2 B& f; m( x
Bullhead, Brown 2 0.09 0.09 0.07 0.1
C& W4 x6 Z# j4 K3 o! y7 XCapelin 4 0.02 0.02 0 0.05# Q8 W, Z) O1 Z% B6 |
Carp 1 0.1 0.1 0.1 0.1
# `- [' t7 z0 G2 N& vCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37& [9 w; b- b8 a' T5 O- N3 s
Char, Arctic 5 0.09 0.10 0.05 0.05
9 p# [1 A [! [/ Z2 m0 c* w$ JClam (various species) 40 0.03 0.01 0 0.08
% ?5 K( F& F2 F) ]' ?( DCockle, Greenland 1 0.05 0.05 0.05 0.051 L# \! u3 K6 }! V. n+ G* c4 u
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28. b2 E! L1 T5 {/ C8 f6 t
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37. u5 G* n, T5 T
Crawfish 1 0.1 0.1 0.1 0.1
( W, K! `* B6 n1 b2 E3 K6 Q; yDrum, Freshwater 2 0.22 0.22 0.03 0.4& }% u4 G, f% x
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
) r% H" Y, p9 h1 p1 M: }Eel (species not specified) 107 0.24 0.16 0.01 1.70; \; ~& T' m+ S' S
Flounder (various species) 22 0.06 0.06 0.03 0.12
, h. l6 b; A; D1 F9 P2 Z; {: wHaddock 3 0.05 0.05 0.03 0.07 |
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