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Register a new userAcclimation Trial of Liza aurata Fingerlings To Fresh Water and To a Low Water Salinity
أقلمة اصبعيات البوري دهبان (Liza aurata) للمياه العذبة و لدرجة ملوحة منخفضة
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كاترين منصور( باحث )
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تم إجراء البحث لدراسة مدى تأثير الأقلمة الفورية و المتدرجة للمياه العذبة و كذلك الأقلمة المتدرجة عند درجة ملوحة 3‰ على معاملات النمو عند اصبعيات البوري دهبان التي تم جمعها مباشرة من البحر و بعد استراحة قصيرة قمنا بتوزيع الاصبعيات الى أحواض زجاجية سعتها 100 ليتر و بمعدل 30 إصبعية لكل حوض. تم أقلمة اصبعيات الحوض الأول بشكل فوري مباشر للمياه العذبة, بينما أقلمت اصبعيات الحوض الثاني تدريجيا" للمياه العذبة, أما اصبعيات الحوض الثالث فتم أقلمتها بشكل تدريجي لدرجة ملوحة مختارة (3‰) و تركت اصبعيات الحوض الرابع كشاهد في مياه البحر. تم تغذية الاصبعيات بعليقه تحوي 35 % بروتين و 500 كح/100 غ عليقة بمعدل مرتين في اليوم حتى الشبع لمدة 75.يوما".
This study was conducted to investigate the effect of abrupt and gradual acclimation of Liza aurata fingerlings to fresh water and gradual acclimation to a selected salinity 3‰. L.aurata fingerlings were collected directly from the sea and duplicate groups of 30 fingerlings were distributed after rest to glass aquaria (100 liter capacity). The first group was acclimated abruptly to fresh water, the second gradually to fresh water, the third was acclimated gradually to 3‰ and the last group was left as control in sea water. The fingerlings were fed artificial diet (35% protein and 500 kcal GE/100g), twice a day to satiation for 75 days.
References used
Agiragac,G. and Kalma,M. A research on the growth rate on the mullet (Mugil auratus Risso, 1810) fingerlings fed different diets in cages (in Turkish). Tr.J. of veterinary and animal sciences, Vol.23, No.4, 1998, 751-755
Altun,T.D. Effect of testosterneundeconoate on growth of Golden Grey Mullet (Mugil aurata, Risso, 1810) in fresh water. The 7Th Balkan Conference on Operational Research, Constanta, May, 2005, Romania, 573
Atay,D. Sea fish and culture procedure (II. Press) (in Turkish). Publication number of fisheries department of Agricultural Faculty, University of Ankara, Vol.329, 1994, 316
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Acute toxicity of the pesticide Chlorpyrifos tests were conducted to determine the
Lethal concentration LC50 during 48 hours exposure on three species of fresh water
Zooplankton: Brachionus calyciflorus ( Rotifera), Mesocyclops leuskarti (Copepoda)
and
Daphnia magna ( Cladocera).
• It was found that the species Daphnia magna is the most sensitive to the pesticide
Chlorpyrifos as the value of 48h-LC50=1.28 μg/L, followed by the species Mesocyclops
leuskarti 48h-LC50=28 μg/L while it was observed severe lack of sensitivity of the species
Brachionus calyciflorus to the pesticide 48h-LC50=910 μg/L.
• Depending on the values of the units of toxicity TU has been shown that the
toxicity of the pesticide Chlorpyrifos is from the fourth level = highly toxic (TU = 78.30)
for Daphnia, and Level III = acute toxicity (TU = 3.57) for Mesocyclops, while it is the
first level = non toxic (TU = 0.11) for Brachionus.
• Each increase in the concentration of the pesticide 1.0μg/L lead to increase the
mortality rate in the species studied about: Daphnia magna ، % 68.79 Mesocyclops
leuskarti ، % 0.22 Brachionus calyciflorus % 0.0468
As a result, we can expect that the arrival of the pesticide to aquatic ecosystems will
affect the whole bio-community in these ecosystems and the inter their relationships,
which in turn could be the cause of the disruption of the ecological balance with vague
consequences that are difficult to understand its dimensions.
According to the algae ability in photosynthesis and carbohydrate production with
high value in nutrition and industry, this research was carried out during 2015 to study the
qualitative and quantitative content of carbohydrates in Chlorella vulgar
is which was
isolated from southern Syrian fresh water, and to determine the effect of the growth
conditions; temperature (15, 25, 35 C), sodium nitrate concentration (0.1, 0.25, 0.4 g/l) and
pH (6, 7, 8) on that content. The results showed that the total content was in the range of
20% to 40%;with galactose and rhamnose dominating among the rest of sugars. The
temperature 15°C was the best to get the greatest total content with the highest value of
starch, cellulose, hemicellulose and pectin. In addition, the low nitrate concentration 0.1 g/l
was combined with the highest content of pectin and its compounds, while the glucose
content was not affected by the nitrogen concentration. Related to pH effect, the acidic
media was proved to be the best for the highest carbohydrate content. Moreover, cellulose,
starch, and pectin increased in the alkali medium over the rest of carbohydrates.
This research discuss the method followed to specify water transmissivity;
using the water balance data related to the natural model of aquifer; in order
to pinpoint this transmissivity values on vast areas and; therefore; drawing of
the regional
water transmissivity
This method is based on the steady relation between water transmissivity
and the amount of natural charging is case of constant motion that is reflected
on the piezometeric surface of the artesian water and the depth of water level
with regard to free aquatic.
Undoubtfuly, pinpointing transmissivity values and then drawing charts of
regional water transmissivity depending on this method have a great
significance practically, especially when complicated hydrogeological
conditions are modeled. All the places of hidden tectonic dislocations can be
clarified and scrutinized, bicides, there is then an ability to specify all charging
and discharging areas, and explain the transformation of rock characters.
Over, and above, all the results attained correspond with the geological,
structural, and lythological characteristics of studied area.
Natural changes in the level of ground water through time is gaining great
importance in evaluating the water system and to provide a lot of information about
groundwater movement , which allows the assessment of the water situation public water
l
ayer in the study area .
We adopted our measurements in groundwater levels frequencies on a private
network monitoring hydrogeological She is the author of 26 wells distributed over the
entire area of the region studied were carried out in some measurements for a period of six
years. The study found that groundwater system of climate type (water division line) is
directly linked to seep from rainfall and seepage from canals and irrigation water plays a
significant role in the pose, which is characterized by Baltkareh and periodic quarterly in
the annual changes of the levels, and the stability and balance in the conditions of these
elevations, and the general direction of movement of groundwater will be from the east and
north-east towards the west and southwest and Askew Hydraulic 0.005 a faddish
topographic situation and the general trend of the cracks and fissures in the area.
Groundwater Samples were collected from seven locations distributed in
Lattakiabasin during the winter and summer seasons of 2013.All samples were treated
chemically and calculated statistically to evaluate the quality of the studied water and its
chemical properties. The aim was to assess the suitability of the water to be potable and to
determine the predominant hydrogeology status.
It was noticed that the concentrations of the detected major elements were within
allowed limits cited for drinking and irrigation waters. Also, it was found that there were
no sharp changes either in salinity or in geochemical type of the water toward groundwater
movement. Furthermore, the groundwater in the studied locations was largely influenced
by lithological composition of aquatic holder. In general, these waters were found to be
uncontaminated with marine waters with exception of the location called " wall of Al
Mena Al Baida" that is located near the sea. This has been proven by calculation of some
of geochemical proportions. Also, this study proved that the aquatic flows in the different
water holders of Latakia basin have a hydrolytic relationship among them. Consequently,
these flows comprise a uniform aquatic flow with homogenous properties in most of its
parts. The direction movement of this uniform flow was identical to the general decline of
the zone mostly.
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