Table 7.7 Composition of the urine of fishes
Tubular
Sodium
Potassium
vol.
GFR
H20
°/0
cone.
total
cone.
total
osmolarity
(mlJkg hr)
reabsorption m-eq
/I
ueq /kg h
m- eq /]
ueq /kg h
m-o smol e/I
O steicht h yes
Protopterus aetb iopicust FW
4.9
14
69
5.5
27
-
-
17
(African lungfish)
Cara ssius auratu s 2
FW
13.7
2004
33
11.5
158
104
19
36
(Goldfish)
Esox lu cius 3
FW
0.6
3.1
77
<0.5
::::!
0.5
5.5
3.3
37
(Pike)
Opsanus tau'
SW
0.18
aglom .
-
73
13
9
16
356
(Toadfish)
Platichthy s {lesus 5
FW
1.8
4.2
57
30
43
1.2
2.2
90
(Flounder)
SW
0.6
204
75
60
36
2.5
1.5
275
Anguilla angu illa 6
FW
3.5
4.7
25
19
56
0.7
2.5
(Eel)
SW
0.6
1
40
6.5
4
2.1
1.3
Salmo gairdn eri' . 8, 9
FW
4.0
6.5
38
9.3
37
1.3
5.2
(Trout)
SW
0.Q3
004
93
220 (el)
Chond r icht h yes
Squalus acanthias-", 11
SW
0.18
3.0
94
339
61
2.0
0.4
780
(Spiny dogfish)
Prist is microdow?
FW
lOA
19
45
'T races'
54
(Freshwa ter sawfish)
- -
Agnatha
Lampetra {luviatilis 13
FW
13.7
21
34
15
106
2.7
37
(River lamprey)
Myxine glut inosa 14
SW
0.22
-
-
480
72
12.8
3.8
1000
N
(Atlantic hagfish)
- (Jl