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Human Health Risk Assessment of Mercury in Fish March 20074 o h* l& e; Z( Q6 B, m
and Health Benefits of Fish Consumption
1 I2 e. F' [+ r4 }8 I7 fWith respect to the types of mercury found in fish, both inorganic and organic mercury may be8 z3 W: W6 N! P9 x3 r6 [ @* w: k
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical7 M- E U* Q& q/ [0 `) K
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
8 W) N, J0 @. ~proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury; Q$ {/ E0 o7 m0 j
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
5 x; M3 J0 C# ]" u1 }/ }& U) Zhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other# j% i' W, K! J$ q1 Q) C/ c: ?& P
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
* C4 U$ M/ W, J3 Y' Rlesser extent than methyl mercury.: {( B, G8 I C$ a
APPENDIX I# G8 B: ?" H- C# b( s) f
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency: U# x7 w% m! `2 @* a5 Z% T V
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.; r: X/ R$ ]8 ^$ `" b3 a
Samples were collected at the importers= or at domestic processing plants during the periods April 1,
; |' u% @; i% f6 X" E9 U2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
, h- |! J; V/ x- S% v2 Cconcentration of zero indicates that mercury was not detected above the analytical detection limit.3 U" c$ ` |. i, F1 L, u7 _
Total Mercury Concentration0 f. c6 d2 f7 d" `* n
(ppm)6 F- {5 |: d1 U- K* q
Species. g7 O. m! o+ |: C
No. of
+ a/ c5 ~, g4 w; {samples% j9 [6 C8 u' Z' c3 h3 |
(N) Mean Median Min Max" G8 o- d- b' _$ b# W" N+ j1 W o
Amberjacks 3 0.17 0.14 0.11 0.27
0 j3 W9 t9 Z8 }4 @4 P& aBarracouta 1 0.06 0.06 0.06 0.06" h9 b r4 D( | A1 G5 [2 }
Basa 5 0.02 0.02 0.02 0.02# a, }0 x$ @) m1 @
Bullhead, Brown 2 0.09 0.09 0.07 0.1
5 y. T+ K% s' {, uCapelin 4 0.02 0.02 0 0.05. H* z* y* A! g* A$ s' O& b5 ~
Carp 1 0.1 0.1 0.1 0.1
* C6 R2 x. l C0 a, ]Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
6 R& \; d/ L2 S( _Char, Arctic 5 0.09 0.10 0.05 0.05
E! Y6 I* P6 A6 D: `Clam (various species) 40 0.03 0.01 0 0.08
# g9 s, ~4 R# sCockle, Greenland 1 0.05 0.05 0.05 0.053 p+ }% t2 s7 o& ~3 L" R4 q5 L
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.282 W' a: G; @( ?" Z$ `
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
0 F) M+ N4 Y( d7 gCrawfish 1 0.1 0.1 0.1 0.1
- l# Y$ z* Z S! ~" d# j" sDrum, Freshwater 2 0.22 0.22 0.03 0.40 V( n9 Y1 D6 M% J- N/ c& A
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
( @% w, s4 _2 U) e8 MEel (species not specified) 107 0.24 0.16 0.01 1.704 ~( u4 Y0 Y# n& K. n6 X6 I# \; `
Flounder (various species) 22 0.06 0.06 0.03 0.124 c/ a% s2 Q$ Z2 Z8 l; k. F
Haddock 3 0.05 0.05 0.03 0.07 |
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