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Article
Effect of Ph on the Growth and Survival of Juvenile Common Carp (Cyprinus Carpio L.)

Authors: Noori Abdul-Nabi Nasir --- AbdulKareem Taher Yesser --- Qusay Hamid Al-Hamadany
Journal: Iraqi Journal of Science المجلة العراقية للعلوم ISSN: 00672904/23121637 Year: 2019 Volume: 60 Issue: 2 Pages: 234-238
Publisher: Baghdad University جامعة بغداد

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Abstract

Common carp ( Cyprinus carpio L.) juveniles averaging 7.68± 0.25 - 8.12± 1.14 g in weight were used for 6 weeks to investigate their survival and growth preferences. The experimented carp were stocked at 12 tanks formerly adjusted with different pH levels values as: 6.0, 7.0, 8.0 and 9.0. Growth and survival of common carp was assessed every Sunday of each week. Growth rates significantly (P < 0.05 ) increased at pH 7 and pH8 respectively. Therefore, the results suggest that the water with pH ranged from 7 to 8 was the best range for growth performance and survival rate of carp. Feed conversion ratio (FCR) improved at pH 6 and 9 respectively. In general, the results indicated that water pH 7- 8 could be more appropriate to juvenile carp culture for best growth performance and survival rate.


Article
DETERMINATION OF SOME TOXIC TRACE ELEMENTS OF FRESH, FROZEN AND CANNED FISH SPECIES
تقدير بعض العناصر النزرة السامة في عضلاث أنواع من الاسماك الطازجة والمجمدة والمعلبة

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Abstract

In this study, fresh fish (Otolithes ruber, Saurida tumbil, Pseudorhombus malayanus, Acanthopagrus latus, Hypophthalmichthys molitrix and Tenualosa ilisha), imported frozen fish (Megalaspis cordyla, Ctenopharyngodon idella, Labeo rohita and Acanthopagrus latus) and imported canned fish species (sardines, mackerel and tuna) were used to detect and determine some toxic trace elements. All fish samples contained trace elements. The total concentrations mean for Cu, Zn, Pb, Ni, Co, Cd and Mn were between (1.73-11.93), (8.75-25.80), (ND-3.19), (0.11-0.31), (0.10-0.35), (0.23-3.00) and (0.11-1.86) mg/kg dry weight respectively in muscles of fresh fish, and between (13.21-53.74), (6.61-43.93), (0.35-2.10), (0.37-2.30), (0.20-0.54), (1.50-3.53) and (0.13-4.50)mg/kg dry weight respectively in the muscles of frozen fish species, and between(21.75-56.30), (5.21-82.84), (0.25-1.51), (0.33-1.96), (0.20-0.47), (0.51-2.22) and (0.13-0.81) mg/kg dry weight respectively in canned fish . Concentrations average of some trace elements were exceeded the permitted legal limits that set by the Food and Agriculture Organization and the World Health Organization.


Article
The use of treated wastewater in Barbus xanthopterus and Ctenopharyngdon idella larvae culture
استخدام مياه الصرف الصحي المعالجة في تربية يرقات اسماك الكطان Luciobarbus xanthopterus والكارب العشبي Ctenopharyngdon idella

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Abstract

Larvae of Luciobarbus xanthopterus and Ctenopharyngdon idella were cultured in ponds with treated wastewater in marine science center by adding 20 larvae to each pond in a replicate to each species as well as the control ponds to the two species. Experiment was expend to six weeks depending on the natural food available in the pond. While standard artificial diet was add to the control ponds. Some biological measurements were done including length and weight rates, weight increase and daily weight increase, relative and specific growth rates and survival rates. Results showed a clear excellence of treated wastewater ponds in all biological measurements from the control ponds at the tow species. Larvae of L. xanthopterus showed a length and weight rates, weight increase and daily weight increase and survival rates higher than C. Idella which were (4.41 ± 0.04) cm, (0.35 ± 0.06) gm, (0.322 ± 0.005) gm, (0.008 ± 0.0002) gm/day and (91.67 ± 2.89) % respectively, while C. Idella showed relative and specific growth rates higher than L. xanthopterus larvae which were (3790.40 ± 877.88) % and (8.85 ± 0.56) %gm/day respectively. The study showed that the use of treated wastewater in L. xanthopterus and C. Idella larvae culture was excellent and rise the growth and survival rates of these larvae.

وضعت يرقات اسماك الكطان Luciobarbus xanthopterus ويرقات اسماك الكاربالعشبي Ctenopharyngdon idella في احواض ت ا ربية جيزت بمخمفات مياه الصرف الصحي المعالجة في مركز عموم البحار وبواقع 02 يرقة لكل حوض وبثلاث مكر ا رت لكل نوع اضافة الى حوضي السيطرة لنوعي الد ا رسة. استمرت التجربة لمدة ست اسابيع اعتمد فييا عمى الغذاء الطبيعي المتوفر في الحوض اما احواض لسيطرة فقد اضيفت ليا عميقة قياسية. أجريت بعض القياسات الحياتية عمى اليرقات اذ شممت معدلات الطول والوزن ومعدلات الزيادة الوزنية و الزيادة الوزنية اليومية والنمو النسبي والنمو النوعي ومعدلات البقاء للأسماك. اظيرت النتائج تفوقا واضحا لأحواض التربية في مياه الصرف الصحي المعالجة لكلا نوعي الاسماك في كل القياسات الحياتية عن احواض السيطرة , كما أظيرت يرقات اسماك الكطان معدلات اطوال وأو ا زن ومعدلات زيادة وزنية وزيادة وزنية يومية ومعدلات بقاء اعمى من يرقات اسماك الكارب العشبي اذ بمغت (4.41 ± 0.04) سم, (0.35 ± 0.06) غم, (0.322 ± 0.005) غم, (0.008 ± 0.0002) غم/يوم و (91.67 ± 2.89)% عمى التوالي, بينما امتمكت يرقات اسماك الكارب العشبي معدلات نمو نسبي ونوعي اعمى من يرقات اسماك الكطان وبمغت (3790.40 ± 877.88) % و (8.85 ± 0.56) %غم/يوم عمى التوالي. اوضحت الد ا رسة ان استخدام مياه الصرف الصحي في رعاية يرقات اسماك الكطان والكارب العشبي يرفع من معدلات النمو والبقاء لتمك اليرقات.

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