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Human Health Risk Assessment of Mercury in Fish March 2007
' k. n5 I0 T$ |4 S; p0 A3 b4 W0 Hand Health Benefits of Fish Consumption
" [! k, O: Z @8 Z3 mWith respect to the types of mercury found in fish, both inorganic and organic mercury may be) B( y9 O7 B. ~4 x
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical% o& n$ a5 g5 y- F- Z7 l- x: o
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
$ F. X5 V& g+ R* Q$ ?1 pproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
/ z8 j( A7 q$ S0 q3 C; glevel increasing with age of the fish. In turn, bio magnification along the food chain leads to0 t- [1 z* C3 |
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other. k/ d$ w$ H( Q2 k* {4 I& }
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far1 c7 u1 q) J3 O+ t; ?0 O& h3 |
lesser extent than methyl mercury., I# H7 y! o9 B% y6 R; m. n
APPENDIX I0 l: T. C& h8 c3 A' v/ A/ P7 Q
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
' y! C3 o' o7 U7 X6 G4 v- b(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
+ b w: b6 G ?3 j* K5 S: B" Q; H% z- f; ySamples were collected at the importers= or at domestic processing plants during the periods April 1,8 }3 d( U3 D' P7 g$ U; |
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A+ ` R% @+ t+ G$ u( J: r$ ~6 S
concentration of zero indicates that mercury was not detected above the analytical detection limit.2 h' u% k- L6 T: G% L
Total Mercury Concentration( K! z( s' D5 N
(ppm)
8 ^) y! G6 f2 N- q8 m, USpecies. q4 P% j- [ M4 H+ u( z1 ?4 k
No. of+ @/ q) L! J* g. U
samples
7 r$ V* [) E0 z7 S6 ?(N) Mean Median Min Max
& q$ v3 Z" @1 \: F$ S3 Y/ HAmberjacks 3 0.17 0.14 0.11 0.27
9 E' a! C- i# NBarracouta 1 0.06 0.06 0.06 0.06
6 K2 {! U1 C$ F8 ?Basa 5 0.02 0.02 0.02 0.02
, C: c- U; v5 @$ ]9 s' zBullhead, Brown 2 0.09 0.09 0.07 0.1. T5 ]; m8 O/ }& n
Capelin 4 0.02 0.02 0 0.05
" b& L' w8 ~7 e! N$ OCarp 1 0.1 0.1 0.1 0.1- G3 M+ Z: ^" u( a
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37' d$ B) f9 L7 c
Char, Arctic 5 0.09 0.10 0.05 0.05
; U, {$ B3 `% l0 _& i8 EClam (various species) 40 0.03 0.01 0 0.085 }( |3 z6 f. h! Y' `
Cockle, Greenland 1 0.05 0.05 0.05 0.054 p- _" L- L1 ~( g
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
0 E# y' v2 m$ ?3 BCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37) [$ R' W* E0 C* m
Crawfish 1 0.1 0.1 0.1 0.1
' u U9 \4 c4 Q; |Drum, Freshwater 2 0.22 0.22 0.03 0.4
3 ~+ ?4 k* {5 U" w' M( hEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.768 j* B: |$ p1 I# L" R- p# t
Eel (species not specified) 107 0.24 0.16 0.01 1.70. }) Z4 u( U$ y. j
Flounder (various species) 22 0.06 0.06 0.03 0.12" K$ k, g+ u- R! K" k+ }* z4 @
Haddock 3 0.05 0.05 0.03 0.07 |
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