334
CHESTER JONES, CHAN, HENDERSON, AND BALL
and has been used extensively for the study of the role of the adrenal
cortical secretions in osmoregulation. Some of these results will be summarized below. How far one can make generalizations from the study of
one species to cover the highly diversified Actinopterygii remains to be
determined.
In the eel, Anguilla anguilla, the changes resulting from adrenalectomy vary according to whether the fish are living in freshwater or seawater. In freshwater eels, after adrenalectomy there was a substantial
water retention, amounting to 1% body weight per day (D. I(. 0. Chan
et aZ., 196713; Fig. 2). There was a marked hemodilution which was reflected in the decline in plasma sodium, calcium, magnesium, and chloride
concentrations (Table 11) and a marked rise in muscle water content.
20
IS
I0
L
d
ae
0
- 5
- I0
FRESHWTER EELS:
SEAWATER EELS'
-0AhndOmnnd
-0l3dmkbwed
-*- SIwnmctomzed
-0stamiecmzed
---*- SlUn-apaoted
-+.-T
/ f -
i
-
0
5
1 0
15
20
Doys after opemtii
Fig. 2. Changes in body weight in freshwater or seawater eels following adrenalectomy or removal of corpuscles of Stannius. Modified from D. K. 0. Chan et al.
(196%).
CHESTER JONES, CHAN, HENDERSON, AND BALL
and has been used extensively for the study of the role of the adrenal
cortical secretions in osmoregulation. Some of these results will be summarized below. How far one can make generalizations from the study of
one species to cover the highly diversified Actinopterygii remains to be
determined.
In the eel, Anguilla anguilla, the changes resulting from adrenalectomy vary according to whether the fish are living in freshwater or seawater. In freshwater eels, after adrenalectomy there was a substantial
water retention, amounting to 1% body weight per day (D. I(. 0. Chan
et aZ., 196713; Fig. 2). There was a marked hemodilution which was reflected in the decline in plasma sodium, calcium, magnesium, and chloride
concentrations (Table 11) and a marked rise in muscle water content.
20
IS
I0
L
d
ae
0
- 5
- I0
FRESHWTER EELS:
SEAWATER EELS'
-0AhndOmnnd
-0l3dmkbwed
-*- SIwnmctomzed
-0stamiecmzed
---*- SlUn-apaoted
-+.-T
/ f -
i
-
0
5
1 0
15
20
Doys after opemtii
Fig. 2. Changes in body weight in freshwater or seawater eels following adrenalectomy or removal of corpuscles of Stannius. Modified from D. K. 0. Chan et al.
(196%).