American Journal of Applied Science and Technology
26
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VOLUME
Vol.05 Issue 04 2025
PAGE NO.
26-27
10.37547/ajast/Volume05Issue04-06
Parasitofauna Of Productive Fish: Lower Area of The
Amudarya River
Sultanov Esbosyn Kosymbetovich
Senior Lecturer of the Department of Zoology, Human Morphophysiology and Teaching Methods, Nukus State Pedagogical Institute
named after Ajiniyaz, Uzbekistan
Received:
23 February 2025;
Accepted:
19 March 2025;
Published:
22 April 2025
Abstract:
We analyzed this article based on our research on the parasitofauna of productive fish in the lower
reaches of the Amu Darya. In this article, we have followed the practical and theoretical views of scholars such as
V. Dogel, Y.N. Perevezentseva, S.O. Osmanov, and K. Ubaydullayev.
Keywords:
Parasites, trichodina meridionalis, gyrodactylus sp. lech rhipidocotyle illense, carp jchthyhda necatrix,
sanguinicola inermis, posthodiplostomum brevicaudatus, Dactylogyrus vastator, Dactylogyrus sp.
Introduction:
Fish are especially sensitive to the influence of various
environmental factors in the early stages of their life
cycle. It is during this period that, under the conditions
of natural reservoirs, they perish and are destroyed in
an unaccounted-for quantity, which ultimately affects
their numbers and the fish productivity of the reservoir.
Therefore, studying young parasites during the first
months of postembryonic development is of great
scientific and practical interest.
METHODS
In the Aral Sea basin, the parasites are young
commercial fish from. The Syr Darya region was first
studied (under the guidance of V.A. Dogel) by Y.N.
Perevezentseva (1945), young mustachers in the Amu
Darya and Aral Sea by S.O.Osmanov (1961). The
parasites and diseases of young carp in the Tashkent
region of the Republic of Uzbekistan were studied by
S.O.Osmanov (1963, 1965), in the ponds of the
Republic of Karakalpakstan by A.Urazbayev (1966,
1973). K. Ubaydullayev (1966, 1969) discovered 22
species of lesh and 31 species of carp in the young carp
of the Akkala lake system and the freshwater Abbas
bay. According to our unpublished data, the
parasitofauna of young roaches from the Amu Darya
delta is supplemented by species: Trichodina
meridionalis, Gyrodactylus sp. Lech Rhipidocotyle
illense, carp Jchthyhda necatrix, Sanguinicola inermis,
Posthodiplostomum brevicaudatus. We studied the
young parasites of commercial fish such as catfish,
bream, and carp in 1996 and 2003. 248 young fish
caught in the coastal zone of the reservoir were
studied. (larvae 141, fry 32, yearlings 60, head 15). The
first infection was observed in larvae with a div length
of 7-9 mm (approximately 6-10 days). They have Para
trichodina inciscalis and Dactylogyrus nanus. In 10-12
mm long larvae, the 10-15 day list of parasites was
supplemented
by
Dactylogyrus
crucifer
and
B.acheilognathi. In 13-20 mm large, but 16-30 day old
larvae, the parasitofauna of merlin larvae already
included 8 species. Among the newly emerged
monogenea (Dactylogyrus rarissimus, D.suecicus,
Paradiplozoon homoion) are cestodes (larvae
(Gryporhynchus pusillum), whose infection is
associated with the consumption of planktonic
crustaceans. The infection of larvae with infusoria,
dactylogyrids, and botriocephalus has significantly
increased.
RESULTS AND DISCUSSION
The list of fry parasites (22-24 mm) includes 21 species.
Among them are Caryophyllarus laticeps, whose
invasion occurs during the transition (fully or partially)
to benthosal nutrition. In this case, the fish, along with
other bottom invertebrates, eat the oligochetes of the
intermediate hosts of carnations, swallowing the
spores of myxosporidia (Myxidium rhodei, Myxidium
pfeifferi, Myxobolus pseudodispar) that have settled to
the bottom of the reservoir.
The parasitofauna of the females, compared to the
American Journal of Applied Science and Technology
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American Journal of Applied Science and Technology (ISSN: 2771-2745)
parasitofauna of the fry, has undergone qualitative
changes. However, certain quantitative studies have
been observed in their infection with certain types of
parasites. This is due to the increase in fish size, the
increase in the amount of food consumed, as well as
the influence of environmental factors.
Plover yearlings, studied in a total of 15 specimens,
were infested with 15 species of parasites. Thus, 18
species of parasites have been identified in young
ground squirrels under one year of age. With age, a
qualitative and quantitative enrichment of the
parasitofauna occurs. Young catfish in the Akchakul
lake were studied in the amount of 155 specimens. 15
species of parasites were recorded in the fry and
females, of which 12 species (Ichthyophthirius
multifiliis up to 26.6%, Dactylogyrus auriculatus 40.0,
D.wunderi 46.6, D.falcatus 33.3, Diplozoon paradoxum
26.6, Rhipidocotyle illense 40.0%, Diplostomum
spathaceum-20.0%,
(Ergasilus
sieboldi)
actively
infected them.
The larvae of Gryporhynchus pusillum enter the div
when they eat the intermediate hosts, the paddle-
footed crustaceans. Many species of fescue fescue
parasites are poorly infected. This can be explained by
the conditions of contact between the host and the
parasite, the small number of the latter in the area
where the young are caught. (Osmanov, Yusupov,
1977).
Dactylogyrus wunderi species (46.6%, infestation
intensity 1-24 specimens) are more prone to parasitic
infection. The increase in the percentage of infection
with Diplozoon paradoxum (55.0%), Dactylogyrus
auriculatus (60.0 infection intensity 2-72 specimens,
average 17.6), D.falcatus (50 infection intensity 1-38
specimens, average 93) indicates increased contact
with older fish. D. underi infection was weak (30.0%).
Ichthyophthyrus was also frequently encountered in
yearlings (45.0%, invasion intensity 1-11 specimens).
Сarp. The carp larvae (103 specimens studied) were
infested with 9 species of parasites. In individuals with
a div length of 10-12 mm, infusoria (Jch.
Thyophthirius, Trichodinella epizootica) monogens
(Dactylogyrus vastator, Dactylogyrus sp.), actively
infecting fish.In larvae with a div length of 13-17 mm,
among the newly mated, along with actively infecting
choline species (Dactylogyrus anchoratus (100%),
D.extensus 16.6-35.7%, there were also those that
were infected by eating paddle-footed shrimp (larvae
of Gryporhynchus pusillum), echchysts (Eimeria
carpelli).
Simultaneously,
infection
intensified
(Trichodinella epiootica (42.8%), D.actylogyrus vastator
(infection activity 1-21 specimens. Bothriocephalus
opsariichthydis (32.1%).The parasitofauna of carp fry is
represented by 13 species. Myxobolus dispar,
Gyrodactylus medius, Eudiplozoon nipponicum,
Diplostomum spathaclum. Eimeria carpelli (51.7%),
D.actylogyrus anchoratus (up to 82.7%), D.vastator
(100% invasion intensity 1-40 specimens. Average
15.1), B.othriocephalus 51.7%). In females, the number
of parasite species increased to 15 (Table 1 of the
appendix). In the territory of Lake Akchakul, Ctynaea
cyprinid, Myxobolus dispar, Dactylogyrus anchoratus,
and Zernaea elegans were recorded for the first time in
young carp. The intensity of infection by Eimeria
carpelli
(80.0%),
D.anchoratus
(92.0%),
B.opsariichthydis up to 17 (115 specimens) increased.
The strong infection of young animals of different ages
with
Trichodinella
epizootica
(20.0-60.0%),
Schthyophthyrius multifilis (8.8-48.0%), monogenia of
D.anchoratus,
D.vastator
(35.5-100%),
B.opsariichthydis (10.0-92.0%). Explain the favorable
contact conditions in the corded section of the lakes. It
can be said that the formation of the young
parasitofauna of the studied fish follows previously
established patterns (Dogel, 1933, 1958, Polyansky and
Shulman, 1956).
CONCLUSION
1. The first to appear in the young are parasites with
direct development (infuzories, monogenea). Among
the species that develop with the change of hosts,
Diplostomum and others are among the first to actively
penetrate the fish's div.
2. Later, when transitioning to a zooplankton diet,
young fish exhibit B.opsarichthydis Gryporhynchus
pusillum, whose intermediate hosts are paddle-footed
crustaceans. The transition to benthosal nutrition
causes the infection of helminth species by
intermediate hosts of these invertebrates. In this type
of feeding, the fish also swallow the oocysts of spore-
bearing organisms and the spores of knidosporidia.
3. In young commercial fish of the Akchakul lake (pelt,
catfish, carp), the invasion intensifies with age and
becomes more diverse. Changes in the species and
quantitative composition of young parasitofauna are
closely related to the growth, development, and
qualitative changes in their ecology.
REFERENCES
Быховская
-
Павловская. Паразити рыб (руководство
по изучению). Л.,1983, с.48.
Османов
С.О.
Паразиты
рыб
Узбекистана.
Ташкент,1971,с.269
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Султанов
Е.К.
Юсупов
О.Ю.
Особенности
паразитофауны промысловых рыб озера Акчакуль,
Вестник ККО АН РУз, 2000,№3,с.8
-11.
