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Human Health Risk Assessment of Mercury in Fish March 2007
; c6 s! n" ~5 A1 A( }and Health Benefits of Fish Consumption
+ } `- u W/ G& K9 z% ZWith respect to the types of mercury found in fish, both inorganic and organic mercury may be' w6 k* V6 j/ u# }9 w" l
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical a4 m/ q4 d$ y1 |/ ?
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the! Z& H, ~* r7 W0 Q! Q
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury5 B! O" O2 v' |
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
8 b' W4 e3 D- `$ Q( ~) s$ Thigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other, K: [1 B" }+ |- F. n% a
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far& X# _6 K0 E! {1 k! p
lesser extent than methyl mercury.2 W. _& w; M, \0 n4 u# Z
APPENDIX I \8 W8 B, h( _" F! p' @
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
3 l3 v- B; T, Q% H! L3 I7 O(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.$ Y8 e8 {/ u- o
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
2 ~# L) L& p( }5 h @6 C, p; N c2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
) H4 n: ^. p6 Q0 |2 m! T* D& G% Econcentration of zero indicates that mercury was not detected above the analytical detection limit.1 j) E& ?3 a- I$ C5 l+ s
Total Mercury Concentration% O* R6 b* }. U2 e, @
(ppm)
" N; `1 B& j3 n# eSpecies
, v3 Z5 e0 p( e# i- ]: e CNo. of) ?" g D2 n( c5 q7 p
samples
; U; g, p% G$ k. _(N) Mean Median Min Max
' K9 q* Z) K: Z7 ?( H0 n% [Amberjacks 3 0.17 0.14 0.11 0.27# s, H$ g9 f" E
Barracouta 1 0.06 0.06 0.06 0.06
1 W5 [8 B2 U) t1 \Basa 5 0.02 0.02 0.02 0.02" i9 f- y* \( H& A0 L' I: i9 ~5 [; p
Bullhead, Brown 2 0.09 0.09 0.07 0.1
! ^$ b! Y/ X# I/ R6 l* {0 |" H2 ]$ oCapelin 4 0.02 0.02 0 0.05! i7 N+ z# [, b1 Q8 D+ F# Q# Z
Carp 1 0.1 0.1 0.1 0.1
- z: R9 T1 t- v9 \) a$ t) w# Y% DCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
1 e+ T0 n* ^3 m& C' L; f$ \Char, Arctic 5 0.09 0.10 0.05 0.059 r$ M# z7 M8 z4 K$ I2 G) B
Clam (various species) 40 0.03 0.01 0 0.08
2 i; d2 [. Z$ V5 TCockle, Greenland 1 0.05 0.05 0.05 0.05
" H& y; G* \7 D9 o8 e3 @ dCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
2 q! `4 u/ {; G5 ^& r' V# }Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.378 O6 ]$ Z4 ` B0 C
Crawfish 1 0.1 0.1 0.1 0.1( q( L" d, f+ S8 q, ~$ x7 W! P1 `7 S
Drum, Freshwater 2 0.22 0.22 0.03 0.4
9 g4 d4 r D G. k1 h5 O7 Y" zEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76* P' z" h( h( m6 F4 t
Eel (species not specified) 107 0.24 0.16 0.01 1.70: k& Y5 r2 c/ w* I M
Flounder (various species) 22 0.06 0.06 0.03 0.12
' E( u) w) E, m; kHaddock 3 0.05 0.05 0.03 0.07 |
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