7123 ‎(3)‎

• UCREFRP Catalog Number: 7123
• Author: Klima, E. F.
• Title: Voltage and pulse rates for inducing electrotaxis in twelve coastal pelagic and bottom fishes
• USFW Year: 1972
• USFW - Doc Type: Journal of the Fisheries Research Board of Canada
• Copyright Material: YES

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JOURNAL FISHERIES RESEARCH BOARD OF CANADA, VOL. 29, NO. 11, 1972
SCALED SARDINE 1.5 Volts
I
1C
11
11 !5 Laps
r- t , //
I 1
/ 1
1 ,
1 t
' t 1
0~ I 1
1 1
1 t
1 1
1 1
t ~ 1
1
0 1 I t 16
1 \I 1
1 I s / 1~Averege Number of Laps
~ ~ h
/ ~
1
~ I It 1 12
t i ~
I 1 ~ ,
1 1/ ~ ~ 9
Ir ~
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~~
0 ! 4
~2 Lopa
0 0
5 15 25 35 45 56
SCALED SARDINE 3.0 Valle ~ BUMPER 1.5 Vohs
II
, 1 12
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t
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~ 0

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\ ~ r ••~
~'~'••• `ILOp ~•

SPANISH SARDIN~F ~ 1.5 VOID
~
SPANISH SARDINE 3.0 Volts ~•
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5 15 25 35 45 55 5 15 25 35 45 55
PULSES /SEC
N
a
J
O
K
W
m
5
Z
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a
D
F1G. 5. Times to swim two and five laps and average numbers of laps swum for scaled sardine, Spanish sardine, and
bumper at various pulse rates and voltages. Each plotted value is for an initial lot of 6-22 fish.
the applied voltage,
E=FD=15 x 20=300 v; (4)
and the current,
1 = E _ 300 = 35,294 amp. (5)
R 0.426
The disadvantages of this system are: (1) the
electrical field is not confined, making the effects of
fringing on the electrical field and its interference
with a vessel or platform more pronounced; (2)
the system requires relatively high voltage causing a
safety hazard to operating personnel; and (3) the
fish are directed to a relatively large area making
capture diflicult.
These data show that the parallel plate can pro-
vide an effective electrode configuration from the
standpoint of power requirements and an approxi-
mate uniform electrical field. Smaller size electrodes
are suggested to eliminate the problem of capturing
fish from a large anode (i.e. 10 X 10 plate). Rather
than one anode and one cathode, two cathodes
(rectangular plates or grids) can be positioned about
lO m to the front and back faces of the anode. The
anode consists of two rectangular grids with an
open space between where a suction pump for ex-
tracting fish can be placed. The sides and bottom
of the anodes can be fitted with material to prevent
fish from escaping, or a small secondary electrical
field can be used in conjunction with the pump,
similar to 1Crcutzer's electrical fish pump system
(1Creutzer 1964).
The uniform field between the cathode and anode
fords the fish to swim into the anode grid. Since the
primary field between the anodes does not exist, the
fish should be able to stay within this area until
either the current is turned off or they are captured
by the secondary field and its pump. Fish are pre-
vented from swimming out of the area between the
anodes by the primary electrical field. The space
between the anodes may be increased or decreased
without electrical power changes.
Tn the above system, assuming for each cathode
a surface area of 50 m2 generating a uniform field
of 15 v/m requires a potential of 300 v and a current
pulse of 17,647. amp. A peak power pulse of 5,294
kw is generated. Using a 15 pulse/sec repetition rate,
at a pulse duration of 1.0 msec, the average power