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of iron metabolism that have been studied to date but it is worthwhile to
provide an example of changes in blood parameters that might account
for the redistribution. Table 2 summarizes the results of a study where
measurements were made of serum iron concentrations (µg/100 ml),
haemoglobin concentrations (g/100 ml) and erythrocyte numbers (10 6
cells/mm 3 ) during the seven stages of metamorphosis of P. marinus for
comparison with these parameters in larva and adults (Youson et al . ,
Table 2. Erythrocyte numbers and haemoglobin and serum iron concentrations of lampreys,
Petromyzon marinus , at various intervals of the life cycle. From Youson et al ., 1987.
Interval
N *
Erythrocyte number
(10 6 cells/mm 3 )
N
Haemoglobin
(g/100ml)
N
Serum iron
(µg/100ml)
Ammocoete
18*
0.830 ± 0.099†
(0.360-1.210)‡
18
8.16 ± 0.54†
(6.32-10.50)‡
37
5118.9 ± 1398.2†
(681-15365)‡
Metamorphosing
stage
1
9
5103.4 ± 2232.8
(1495-12518)
2
9
0.747 ± 0.122
(0.504-1.050)
10
6.79 ± 0.54
(5.33-8.13)
7
3029.8 ± 1389.6
(1096-6175)
3
7
1.022 ± 0.139
(0.688-1.200)
6
7.36 ± 0.37
(6.88-8.13)
17
8123.7 ± 1910.8
(1420-16733)
4
10
0.922 ± 0.148
(0.650-1.250)
9
7.12 ± 0.84
(4.80-9.00)
12
4487.7 ± 1110
(1759-7465)
5
10
2739.0 ± 1067.8
(1392-7078)
6
10
0.625 ± 0.057
(0.510-0.725)
10
5.2 ± 0.57
(4.30-7.40)
8
1966.3 ± 1014
(308-4667)
7
9
881 ± 624
(243-3294)
Juvenile adult
12
0.720 ± 0.126
(0.200-0.954)
12
4.58 ± 0.79
(2.66-6.99)
32
3769 ± 545.8
(1095-8159)
Upstream migrant
(F)§
18
0.888 ± 0.120
(0.54-1.350)
19
10.22 ± 0.59
(8.00-12.50)
49
3288.1 ± 921
(94.8-14164)
Upstream migrant
(M)§
26
0.893 ± 0.099
(0.380-1.500)
26
11.04 ± 0.90
(6.00-15.00)
51
1962.3 ± 537
(298-8587)
* Number of animals.
† Mean ± 2 SE.
‡ Range.
§F = female, M = male.
1987a). The highest number of erythrocytes was seen at stages 3 and 4 but
by stage 6 the number had dropped signifi cantly to the lowest level seen
in the entire life cycle. Erythrocyte numbers in larval P. marinus are lower
than several other species (Youson et al . , 1987a), but this may be correlated
to their lower haematocrit (Beamish and Potter, 1972; Potter and Beamish,
1978). The increase in erythrocyte numbers in stages 3 and 4 may be related
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