7114 ‎(2)‎

• UCREFRP Catalog Number: 7114
• Author: Shentyakova, L. F., et al.
• Title: Effect of an Alternating Electric Current on Fishes and Aquatic Invertebrates
• USFW Year: 1970
• USFW - Doc Type: Journal of Ichthyology
• Copyright Material: YES

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Table 1

Data on the effect of a uniform ac electric field on breeding fi shes
on May 13, 1968 (electric conductivity of the water 1.77' 10-4 II
lohm. cm at HOC)

Species Where placed for
spawning
Experiment
Blue bream !j! 28. 29, 28 5 0.100 17.7 2.8-2.9 Spawnin8 pond No. I
. d 26.27, 27. 5.8 0.1\6 20.5 3.0-31 . .
27, 27
. d 26, 26, 27 4.8 0.096 17.0 3.0-3.1
Roach !j! 25, 28 30 0.600 106 15.0-16.8
. d 21, 16, 18, 21 5.8 0.116 20.5 1.85-2.42
Control
Roach !j! n 29, 28 I - I I I I Spawning pond No. 2
. d 4 20.19,16, t9 - . .
Blue bream !j! 3 29, 28, 27 - . .
. d 8 26,26,27,27. . .
26,28,29,27
E.xperimeJlt
Perch !j! I ~ I 30. 32 I 9.810.1961 35 5.9-6.3 I T"';" No.6
! d 20, 25. 22 9 0.180 32 3.6-4.5
Control
Perch !j! Tanl< No. 5
. d .

remained in puddles among the vegetation.
The size of the underyearlings waS as follows:
from pond No. 1 blue bream 2.9 cm, roach
2,3 em; from pond No. 2 blue bream 2.7 em,
roach 2.7 cm.

~'::::--

The daJa. obtained show that the blue bream
and the roach spawned in the experimental and
cimtrol ponds, There was hardly any differ-
ence between the under yearling J:>lue bream and
roach from the experimental ana control ponds
in terms of growth rate.

In 1968 bream 6+ years old reared by us
from eggs on the experimental farm spawned
in ponds No.6 and 7 (growth ponds). These
breeding fishes were 4 times in a state of
electronarcosis in the period 1966-1968 under
the influence of alternating current. On the
last occasion they were subjected to the effect
o[ the current immediately before spawning
(Table 21. In the fall the progeny of the bream
6+ years DId were caught in the ponds and.
samples "'ere preserved. No deviations were
dise:overed in the external appearance of these
W1deryearlings.

It may be concluded from the experiments
carried oot that the ac tion of alternating cur-
rent of commercial frequency on breeding
fishes (producing a state of shock in tbe
course of 5 sec) had no effect on their capacity
[or spawning and on the growth o[ the'young.

In order to study the survival of young
fishes after they had been in a state of shock
[or 5 see under the influence of a uniform ac

electric field we carried out a series of experi-
ments with underyearling roach, blue bream,
bream and white bream, with yearling roach,
blue bream and white bream, with 4-year-old
blue bream and with 4, 5 and 6-year-old bream.
All the experimental fishes had been reared
from eggs on the experimental farm.

The bream 4, 5 and 6 years old and the four-
year-old blue bream were subjected 4 times
before these experiments to the effect of an
alternating electric current producing a state
of shock (1966-1967) and the yearling blue
bream were subjected twice (spring and fall
1967).

After the draining and fi shing out of the
winter ponds on May 31, 1968 the fishes used
in the experiments were placed in plastic
aquaria in which a state of shock was induced
in them by the effect of an alternating current
for 5 sec. These fishes were then placed in
growth ponds. The same number of fishes
which had not been affected by a current were
placed in a neighboring pond (control of the
experiment). On October 4 the ponds were
drained and all fishes remaining alive (in the
experiment and in the control) were counted
and measured. The results of these experi-
ments show that the different age groups in the
control and experimental ponds had practically
the same survival rate and growth rate (Table
2).

In order to study the effect of alternating
current on the development of fertilized fish
eggs and on the survival of larvae series of

366

Table 2

Survival of fishes after the effect on them of alternating current
producing a state of electronarcosis in 5 sec, %

CUITent ~il .:.5 .a . .
stimulus ~ge 'Oi
Age of '"
~il; ~o"D.NE "'u NO . ~5 Pond used .
fishes ~i 's" ~ 'at .
"'~ t .e u 05." 1l~1; .~
Ld~~ "~. II 00 ~u o ~ ~~e ~
p",,,,,,, z._ ~L:.g ZU
~
Blue bream 0' 0.90 208 60 28.5 59 63.0 pawnlngpondNo. I (exper.) 98.3
Roach 0' 0.94 217 1O0 22.5 80 62.7 80.0
VVhite bream 0+ 1.90 357 100 20.5 73 4~.5 . 73.0
Blue bream 0+ - - 60 28.5 52 66.5 pawning pcndNo. 2 (cont.) 86.6
Roach 0+ - - 100 22.5 85 65.6 85.Q
White bream 0+ - - 100 20.5 79 42.6 . 79.0
Blue bream I' 0.26 44 55 85.5 55 100.0 pa~ngpondNo. 3fexper.) 100.0
Blue bream j+ - - 55 85.5 55 \0\.0 pawnmgpoodNo. 6 cont.) 100.0
Bream 4' 0.22 41 40 125.5 40 138.0 Growth pond of No . 6 (exper.) 100.0
5' 0.20 37 45 168.5 45 170.3 100.0
6' 0.18 33 7 205.0 7 208.0 . 100.0
Blue bream 4' 0.16 30 9 164.0 9 175.0 . 100.0
1+ 0.30 49.5 70 63.0 47 109.0 . 67.1
White bream 1 ~ 0.32 52.5 100 42.0 96 86.Q p~pondNo. 7 (cont.) 96.0
Bream 4' - - 40 \25.5 36 1.\.2 90.0
5' - - 45 \68.5 45 171.5 100.0
6' - - 7 205.0 7 206.0 . 100.0
Blue bream 4' - - 9 164.0 9 176.0 >> 100.0
\. - - 70 63.0 5\ 113.5 . 73.0
\\'bite brean. l-t - - 100 42.0 66 66.0 " 66.0

Note. Underyeading blue bream and roach were introduced on June 26 from spaWD-
ing pond No.2. Underyearling whJte bream were introduced on June 26 from spawn-
ing pond No.2. UndeI)learling white bream were introduced on July 2 from spawn-
Ing pond No.5. Roach (I "l were introduced on July 29 born spawning pond No 6
where they had been from M4y 31, after the draining of the winter pond. The older b.re~
and blue bream were introduced on May 31.

Table 3

Survival of perch eggs after their exposure.to alternating current
for 5 sec, %

'01$ No. of Dectric Survival
eggs parameters
. ~ Development I;
8 e 1
]I stage of eggs ~ I; . Ii . e on 11th day on 15th day
o .
~f!< '(O~ ";; ~~~ '8- ~.~ 5
~r::5 ~] "'.... "Ii]
Q~ '"
-'" .s~g ~ b5 .5ug
on ~ .5~e .E~E _u
1 Embryo with mo- 2.0 22 26 0.5 0.062.' 9.4 9.1 i9.2 0 0
bile tail 2.0 26 26 5.0 0.625 94 3.8 0 0 0
2.0 26 26 15.0 A:~t 280 0 B.a " 7.7
2 Formation of 2.0 25 25 0.5 9.4 40.0 12.0 25.0 4.0
embryo 2.0 24 24 1.0 O.t25 18.8 41.6 29.1 3;\.3 23.0
2.0 24 24 2.0 0.250 37.5 0 Q 0 (1
2.0 26 25 5.0 0.625 94 30.7 0 7.7 0
2.0 25 25 10.0 I. 250 188 28.0 i2.0 8.0 8.0
2.0 25 2S 15.0 1.870 280 16.0 32.0 8.0 24.0
3 FonnatioD of em- 2.3 25 25 0.5 0.0625 9.4 8.0 4.Q 4.0 Q
b%yO, eyes not 2.3 2.5 25 5.0 0.625 9. 0 0 0 0
pigm ented 2.3 25 25 IS.O L870 280 160 8.0 4.0 4.0
4 Fonnationofem_ 2.0 22 25 0.5 0.0625 9.4 401 20.Q 27.2 i~.O
bIVe, eyes Dot 2.0 25 25 1.0 0.125 18.8 12.(1 16.0 Q 0
pigmented 2.0 25 25 2.(1 0.2..~0 37.5 24.0 36.0 Jll.O 24.0
2.0 25 25 5.0 0.625 94 48.0 12.0 28.0 4.0
2.0 25 25 10.0 I. 250 18H 36.0 20.Q 32.0 0
2.0 25 25 15.0 \. 870 2HO 12.0 0 " 0
5 Before hlilotching 2.0 25 25 20.0 2.50 375 32.0 0 28.0 0
2.0 25 25 30.0 3.75 560 8.0 36.0 8.0 36.0
2.0 25 2H 50.0 6.25 937 0 16.0 0 1(1.0
2.0 30 28 90.0 11.25 t687 tB.7 46.0 13.3 20.0
6 Commencement 1.,9 24 25 \.0 0.125 18.8 6~.5 84.0 50.0 40.0
of gastrulation 1.9 2.; 23 5.0 0.625 94 88.0 72.(1 72.0 72_0
F (2-ud egg batch) 1.9 25 25 15.0 1.870 280 HS.O 88.0 8Q.0 &).0
7 ormation of em- 2.0 25 25 1.0 0.12.) 18.8 88.0 84.('1 76.0 2l).0
bryo, tail bot 2.0 25 25 5.0 0.625 94 6H.0 76.Q 4H.0 0
leparated 2.0 25 27 10.0 1.250 188 00.0 70.0 li4.(I -- -
;1;).,:)
2.0 2.j 25 13_0 I. 870 280 76.0 84.0 44.0 68.0

367