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

in what is referred to as "schooling" water,
neh was obtained when groups of fingerlings
were kept In it (Table 8).

consumption of a single fingerling in "schooling"
water was little more than half as great as In
ordinary water. The parti al oxygen pressure in
the "schooling" water could not have had an in-
hibiting effect on the respiratory rate of the
fingerlings, since oxygen content was practically
the same in all the experiments and never fell
below the norm.

Table 8

Rate of oxygen consumption
by bream fingerlings,
mg/ghr

In evaluating the research results it may be
considered as established that it is mainly
through the chemical analyzers that the bream
is aware of an accompanying fish in a group.
The organs of vision are not the dominant ana-
lyzers in this species in effecting links between
Individuals in a group. On the basis of the data
obtained by uS and information In the literature
it may be assumed that the extent of the partici-
pation of the different receptor systems in ef-
fecting contact between fish is determined by
the Importance of these systems in the activity
of a given fish species.

M.... One fingerling in experlmenu
weight, ordinary "schooling"
g water water
0.503 I. 284 0.649
0.480 1.316 0.7t1
Mean 1.300 0.680

Water temperature in the experiments was
17.3'C. When an isolated fingerling was
placed in the "schooling"water the group
effect was well-expressed. The oxygen

Submitted April 21, 1969

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effect" in some Black Sea fishes. Voprosy Ikhtiologii, 3, No.4.
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i retseptsii ryb (Fish behavior and reception). Nauka, Moscow.
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Karel'sk. ped. in-ta, 5. -1967. The effect of schooling behavior on the gas exchange of
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cephalon in manifestation of the "group effect" in fishes. Fiziol. zh. SSSR, 46, No.9.
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362

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The Effect of an Alternating Electric Current on
Fishes and Aquatic Invertebrates

L. F. Shentyakova, V. A. Shentyakov, V. S. Stepanov, N. F. Smirnova. V. V. Kuz'II'ina,
O. F. Baronkin, G. D. Bayeva and K. N. Zaytsev

Institute of the Biology of Inland Waters, USSR Academy of Sciences,
Borok, Yaroslavl Province

The paper contains an account of the results of observations ina reservoir on the condi-
tion of fishes and invertebrates behind a trawl electrified by alternating current, and also
of the results of the authors' research on the effect of alternating current on fishes and on
their food resources at the same electric field strength as the strength used in the electri-
fied trawl and at higher strengths.

With the introduction of electrified trawling
for fish in inland bodies of water the question
has arisen of whether it is harmless to the fish
fauna and to aquatic invertebrates. A brief
account of the effect of an electric current on
fishes is to be found in a review paper by L. M.
Nusenbaum and T. I. Faleyeva (1961). These
authors describe the after-effects of the action
of an electric. current (direct, pulsating and
alternating) on different fish species. Accord-
ing to the data of Halsband (1959), an alternat-
ing current has the strongest physiological
effect on fishes. V. A. Shentyakov (1964) con-
sidered the consequences of the action of
alternating current on fishes and on their food
resources. The action of alternating and
pulsating currents on hydrobionts has been in-
vestigated by Riedel (1955). The action of
alternating current electric fields on aquatic
invertebrates has been studi ed by M. Va.
Kirpichenko, V. P. Mikheyevand Ye. P. Shtern
(1963). It has been established by this re-
search that at the electric field strength used
in electrical fishing the electric current does
not have a harmful effect on fishes and on
aquatic Invertebrates.

At the Belgrade Symposium on electrical
fishing held by the European Inland Fisheries
Advisory COmJIlission of FAO, Vibert (1967)
regarded it as proven in his review paper on
electrical fi shing In Inland waters that the elec-
tric current used In practical fishing does not
kill fishes or fish eggs and does not prevent the
growth and evelopment of the fish, In the same
paper Vibert recommended that a thorough
study should be made of the risk of possihle
damage to fishes in electrical fishing.

\

t;

Research has been carried out at the Institute
of the Biology of Inland Waters, USSR Academy
of Sciences. to clarify the effect of an alternating
current on fishes and on their food resource~:nt
electrical field strengths equal to and exceeding
the strength used in an electrified trawl.

Observations in the Reservoir

Observations on the State of Zooplankton
and Benthos Behind an Electric Trawl

The experimental fisheries electric trawl-
Ing vessel (PETS) ~ made an ordinary

363