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Human Health Risk Assessment of Mercury in Fish March 2007
) a* ?; S4 _; S. f; _+ {& ~% B: R( `# @and Health Benefits of Fish Consumption# W% G0 Z+ Y# j* Z& U
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
8 u8 Y) a( ?7 E' Z; z2 @2 Kpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical% w* U- S/ O- x0 d! Y6 m4 a
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the$ ^: J5 y/ k7 o& e' e- T' \# o
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury' G# ?5 p* H" j) r* c& ^- d. C
level increasing with age of the fish. In turn, bio magnification along the food chain leads to) D4 u5 h6 v, x: q6 [
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
5 _4 M4 v. l4 P0 c5 Y! l! @0 v$ sorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
. a- J+ {3 z# ulesser extent than methyl mercury.
" P4 v4 ^, z. n. h7 X; _APPENDIX I
# a! ?# ?/ q; u( Y. @* ?* n# PSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
7 ^+ v& L. p6 F& `(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
6 c5 S$ r$ q. nSamples were collected at the importers= or at domestic processing plants during the periods April 1,, ~# ^9 q& p3 h# R" _% _
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A( T* {, [6 p; C6 Z- C8 A5 }) U9 r$ g
concentration of zero indicates that mercury was not detected above the analytical detection limit.
. Y) f2 {; i0 B( b& G8 {Total Mercury Concentration
4 B; R- Z3 T( } ^/ Q: o: c( U(ppm)
: o, U6 f7 A! S k2 R* q/ mSpecies, G8 U/ w" m0 T+ }' }* w# y5 q! |
No. of: W" H( d1 o* ]0 q1 z
samples9 u" R5 L$ x# n, t5 J, @
(N) Mean Median Min Max3 o+ [# V/ V. B5 j
Amberjacks 3 0.17 0.14 0.11 0.27 w' I+ w& M2 }, a) S
Barracouta 1 0.06 0.06 0.06 0.06
" M, G& }2 h/ Y0 G# ~, KBasa 5 0.02 0.02 0.02 0.02) O% U# b1 q! n" H# B# i
Bullhead, Brown 2 0.09 0.09 0.07 0.1
0 L. w7 ]& [: a" j/ A8 BCapelin 4 0.02 0.02 0 0.05. F! w7 V+ w1 e: O( b% H( }
Carp 1 0.1 0.1 0.1 0.1
/ m. H8 S F1 E2 U$ O4 I+ kCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
+ T- i2 t9 x4 e F' ~0 ~$ H, u( mChar, Arctic 5 0.09 0.10 0.05 0.05
; c* U! t7 S8 W2 XClam (various species) 40 0.03 0.01 0 0.08
( V9 ~$ j) }$ y( n& z' }Cockle, Greenland 1 0.05 0.05 0.05 0.05; g! ~+ J2 Q& x$ w! F' g
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
6 ?9 ?) U0 d/ L: o- {Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37( T; G: O7 @# {+ A
Crawfish 1 0.1 0.1 0.1 0.1/ V( d# I; e) O. p" T
Drum, Freshwater 2 0.22 0.22 0.03 0.4# j8 R8 Q# }/ o- S& Q" l( w6 L4 K: Z
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76/ @- D/ ~, J4 ^0 p) f
Eel (species not specified) 107 0.24 0.16 0.01 1.70# d6 H8 x' H& b" @
Flounder (various species) 22 0.06 0.06 0.03 0.12
- n! K- q2 Y: bHaddock 3 0.05 0.05 0.03 0.07 |
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