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Register a new userFirst record of parasitic copepoda on free – living fish in Lake of 16 Tishreen Dam
أول تسجيل لمجذافيات الأرجل الطفيلية parasitic copepoda على الأسماك الحرة في بحيرة سد 16 تشرين
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Damascus University ورقة بحثية
Publication date
2013
fields
Biology
and research's language is
العربية
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Shamra Editor
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شملت الدراسة 132 عينة سمكية تعيش حرة في بحيرة سد 16 تشرين. جمعت تلك الأسماك عشوائياً خلال المدة الممتدة من 22/11/2011 حتى نهاية 22 /10/ 2012 م، بمعدل جولة/ الشهر، للكشف عن الإصابة بمجذافيات الأرجل الطفيلية parasitic copepoda, و تحديد معدل انتشارها، و تأثيرها في الإنتاجية السمكية.
The study included 132 Free – living fish in Lake of 16 Tishreen Dam, collected randomly during the period from 22/11/2011 until 22/10/2012, on average once a month, for detecting the infection of parasitic copepoda, and determine the distribution rate, and their effect on the fish productivity.
References used
Beckman, W. C. The freshwater fishes of Syria and their general biology and management. FAO FISH. BIOL. Tech .Pap, (8): 1962, 297p
Demaree; R. S. Jr. 1967. Ecology and external morphology of Lernaea Cyprinacea. L. ,Amer. Mid. Nat, 76:416-427
Duijn, C. V. 1973. Diseases of fishes, Academic pressinc, (LONDON) LTD, 372P
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The study included 144 Free – living fish from the Lake of 16 Tishreen Dam, collected randomly during the period from 12/2011 until 11/2012, on monthly basis to detect the infection with Epistylis sp. and determine its distribution rate.
Fish sam
ples were: Cyprinus carpio L., Varicorhinus damascinus, Garra rufus, Tilapia zilli, and Liza abu. Tilapia zilli was the most prevalent in the lake of 16 Tishreen Dam.
The study revealed fish infection with Epistylis sp. on free – living fish in the Lake, with a total infection rate 22.22 % , mainly on Tilapia zillii (29.70 %) and then on mullet (2%);No infection with Epistylis sp. Was recorded on the other fish species. The infection with this ecto Epistylis sp. was recorded for the first time in Syria in our study.
The infection with Epistylis sp. was located on the skin, fins and gills. The highest infection rate was on the fins ( 42.34 %) , followed by skin (37.46 %) , and then by gills (1.87 %) .
The infection with Epistylis sp. had the highest rate in summer ; i.e. during high temperature , low concentration of dissolved oxygen , and slightly high value of BOD.
The study showed that, the water of 16 Tishreen Dam is relatively clean.
The research aims to determine the water Quality Index for the Lake of 16 Tishreen Dam. To achieve
this aim, we have carried out different periodical physic-chemical and bacterial measurements on the lake
water. The samples were taken at five sites
along the lake for a period of one complete year. The indicators
that have been measured are: Temperature, Turbidity, PH, EC, DO, BOD5, NO3, NO2, NH4 ,PO4, F.C.
Measurement results were represented diagrammatically, and compared with the Syrian Specification
Standards for portable Water. The lake was classed according to these Indices: Malays quality index,
Canadian Indices (NSFWQI), (NEWWQI). The Lake was Classed according to these indices as following:
from third grade at all locations (Malays Index), from second grade at the middle lake and from a third grade
to all other locations (NSFWQI), and from second grade at all locations (NEWWQI). According to this
indices the water is not good for drinking and needs treatment. The Productivity of the lake was determined.
The Lake is Eutrophic according to TN,TP in the middle but Hypertrophic according to TN,TP in all other
locations.
Copepoda has a great importance in the environement because of the
important place it has in the food chain, and because it determines the
nutritional situation of the lakes and filtration of Phytoplankton, deteruratus
and bacteria.
The research aims to determine a water Quality Index for the Lake of 16 Tishreen
Dam. To achieve this aim we have carried out a different periodical physicchemical and bacterial measurements on the water of the lake. The Samples were
taken at five
sites along the lake for a period of complete year. The indicators that
، NO2، NO3، BOD5، DO، EC، PH، Turbidity،have been measured are: Temperature
and ، F.C. Measurement results were represented diagrammatically،PO4،NH4
compared with the Syrian Specification Standards for portable Water. The lake was
Canadian Indices ، classed according to these Indices: Malays quality index
(NEWWQI). The Lake was Classed according to these indices as ،(NSFWQI)
from second grade at ،following:from third grade at all locations (Malays Index)
and from ،the middle lake and from a third grade to all other locations (NSFWQI)
second grade at all locations (NEWWQI). According to this indices the water is
not good for drinking and needs treatment. The Productivity of the lake was
determined. The Lake is Eutrophic according to TN-TP in the middle but
Hypertrophic accordingtoTN-TP in all other location
This study aimed at determining the fish fauna composition in 16th of Tishreen Lake
(Alkabeer Alshimali River). A total of 730 individual fishes were collected between April
2012 and March 2013 from five different sites along the lake /Alsafkoon, W
ata-Alsheer,
Alkerassat, Mazraet Alsheikh Deeb, and Alaqfaas area/.
Our results showed the presence of only six main fish species belonging to three
families (Tillapia zillii, Cyprinus carpio, Liza abu,Varicorhinus damascinus, Garra rufa
and Garra lamta). The results also showed that Tilapia zillii was the most caught fish, and
Wata-Alsheer was the richest site in the lake. These results showed a decrease in the
number of fish species and their quantities compared to that in previous studies on the lake.
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