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Human Health Risk Assessment of Mercury in Fish March 2007' M) y* a9 `( M
and Health Benefits of Fish Consumption- j, R- {, M7 S. n4 R4 u
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
2 S9 U4 _, w7 Z3 Opresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical. s7 _' i) H+ } B' Q# T& Q
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
g/ X) A3 m V: `7 n' Vproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury3 K7 p2 [0 I+ B6 ^: {+ K
level increasing with age of the fish. In turn, bio magnification along the food chain leads to, N* i$ @ {2 Z7 B- j2 s
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
8 `& o( L; e4 T5 n, b7 M3 O! Horganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
0 Z% Y* ~& O/ G) c) m7 `& m( T. _lesser extent than methyl mercury.
9 \+ x4 F% ]* VAPPENDIX I
9 Y" P @3 u- U9 Q, D+ _0 KSummary data for those samples of fish that were found by the Canadian Food Inspection Agency/ Y2 e5 N6 t6 X; ?5 @ p
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
3 g/ j' l B: @) f, ]Samples were collected at the importers= or at domestic processing plants during the periods April 1,
0 m9 C1 B* j# u: z. F f+ A2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A6 u% A! F- w. J) K# `
concentration of zero indicates that mercury was not detected above the analytical detection limit.1 w4 X. F7 R. a
Total Mercury Concentration) f& y3 P$ ^; G# f0 D3 @' g
(ppm)
' j6 e3 L* s- tSpecies* S: Q2 v& k" n
No. of! l. A, V o2 E, ?) d* n4 A
samples# Y' p. P+ {1 W a. s$ K2 E" t+ ^/ z
(N) Mean Median Min Max
# k: `- I3 h) }/ l' lAmberjacks 3 0.17 0.14 0.11 0.27
9 D4 R4 f' |' ^8 K; s3 Y! s7 wBarracouta 1 0.06 0.06 0.06 0.06
, x1 C4 |& [: I+ i1 X; y8 tBasa 5 0.02 0.02 0.02 0.02
/ N3 W$ r( V$ }* v) F& l. u# OBullhead, Brown 2 0.09 0.09 0.07 0.1
1 v7 W9 c( N; s8 x0 W YCapelin 4 0.02 0.02 0 0.05% }# V6 t4 N! U. e
Carp 1 0.1 0.1 0.1 0.10 `2 g9 i2 |& z0 T+ o
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37! e/ ^8 ?6 L8 d, R9 W# ]
Char, Arctic 5 0.09 0.10 0.05 0.05
" y6 {8 T. }0 r% [& I" j7 JClam (various species) 40 0.03 0.01 0 0.08( ]8 Z- u' T8 I' _: Q7 v5 O
Cockle, Greenland 1 0.05 0.05 0.05 0.05
! k5 ]) U3 E# W, m$ q4 UCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28# V C# w5 D6 m2 v! G
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
/ m: O5 d/ a% H) ?# ~$ n# qCrawfish 1 0.1 0.1 0.1 0.1# @5 M9 @$ P9 k) j/ H
Drum, Freshwater 2 0.22 0.22 0.03 0.4
7 _: |5 s. T6 {2 @4 A' qEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
+ V7 x: a- F7 j$ J* t* sEel (species not specified) 107 0.24 0.16 0.01 1.70
" O1 Z: X( ]0 ?2 [! AFlounder (various species) 22 0.06 0.06 0.03 0.12* G# l$ k# R: T+ Y7 t% ~
Haddock 3 0.05 0.05 0.03 0.07 |
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