International Journal of Marine Science, 2017, Vol.7, No.9, 76-87
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(i) Fe (Iron): The highest mean concentration of Fe (623±103 µg/g dry wt.) was determined in liver during spring
(2007-2008) and the lowest mean concentration in liver (344±105 µg/g dry wt.) was determined in autumn
(2006-2007). Highest mean level of muscles (46±17 µg/g dry wt.) was found in summer 2008-2009) and the
lowest mean level of muscles (16±6 µg/g dry wt.) was detected in winter (2010-2011). The highest mean value of
kidney (47±16 µg/g dry wt.) was found in autumn (2009-2010) and lowest mean concentration of kidney (16±6
µg/g dry wt.) was detected in autumn (2006-2007). In winter (2010-2011), the highest mean concentration of gills
(46±24 µg/g dry wt.) was recorded; and the lowest mean concentration of gills (15±12 µg/g dry wt.) was recorded
in autumn (2006-2007). Finally, the highest mean concentration of gonads (53±20 µg/g dry wt.) was determined
in summer (2009-2010) and the lowest mean concentration of gonads (7±4 µg/g dry wt.) was recorded in winter
(2006-2007) (Table 2).
(ii) Mn (Manganese): The highest mean concentration of Mn (49±13 µg/g dry wt.) was obtained in liver during
autumn (2010-2011) and the lowest mean concentration in liver (28±12 µg/g dry wt.) was determined in winter
(2010-2011). In spring, maximum mean value of muscles (6±2 µg/g dry wt.) was obtained (2007-2008) and the
lowest mean concentration of muscles (2±1 µg/g dry wt.) was obtained in winter (2006-2007). Maximum mean
concentration of kidney (9±2 µg/g dry wt.) was recorded in summer (2008-2009 and 2010-2011) and the lowest
mean concentration of kidney (5±1 µg/g dry wt.) was recorded in winter, spring and summer (2006-2007). The
highest mean concentration of gills (18±4 µg/g dry wt.) was detected in spring (2009-2010) and the lowest mean
concentration of gills (11±4 µg/g dry wt.) was determined in summer (2006-2007). In spring, maximum mean
level of gonads (7±2 µg/g dry wt.) was obtained (2007-2008) and the minimum mean level of gonads was 3±2
µg/g dry wt. (2006-2007) (Table 3).
Table 3 Mean Mn concentrations (µg/g dry wt.) in selected organs of
K. pelamis
from the Karachi coast
Years
Seasons
n
Muscles (X±SD) Liver (X±SD)
Kidney (X±SD) Gills (X±SD)
Gonads (X±SD)
2006-2007
autumn
16
4±2
29±10
6±2
14±4
5±3
winter
14
2±1
32±10
5±1
15±3
4±1
spring
16
3±2
36±8
5±1
13±3
3±2
summer
20
3±2
42±7
5±1
11±4
4±2
2007-2008
autumn
14
5±2
38±11
6±1
14±3
4±1
winter
16
5±2
40±12
5±2
17±5
5±2
spring
12
6±2
39±19
6±2
13±3
7±2
summer
18
5±1
38±16
6±2
13±3
6±1
2008-2009
autumn
16
3±2
35±18
5±2
14±2
5±2
winter
18
5±2
47±15
5±2
13±3
5±1
spring
14
4±1
38±15
5±2
15±2
5±2
summer
23
4±1
38 ±12
9±2
13±2
6±1
2009-2010
autumn
12
6±1
44±12
7±1
16±3
4±1
winter
18
5±2
41±17
7±1
13±3
5±1
spring
16
4±2
32±15
8±3
18±4
6±1
summer
18
5±2
42±11
8±1
16±4
4±1
2010-2011
autumn
14
5±2
49±13
7±2
17±5
4±1
winter
18
5±2
28±12
8±1
16±4
6±2
spring
12
6±1
29±7
7±1
15±5
5±2
summer
20
5±1
42±14
9±2
14±3
6±1
(iii) Cu (Copper):
The highest mean level of Cu (67±17 µg/g dry wt.) was obtained in liver during summer
(2007-2008) and the lowest mean level in liver (36±13 µg/g dry wt.) was determined in summer (2008-2009). In
winter, highest mean level of edible tissues (7±2 µg/g dry wt.) was recorded (2010-2011). The maximum mean
level of kidney (6±2 µg/g dry wt.) was obtained in autumn (2007-2008) and second maximum mean level (6±1
µg/g dry wt.) was also found in summer (2007-2008). Minimum avarege concentration of kidney (2±1 µg/g dry
wt.) was found in spring (2006-2007) and second minimum avarage value (3±1 µg/g dry wt.) was found in spring
