المؤلفون: Tate, RB¹, Husted, A¹

المصدر: African Journal of Aquatic Science. Jun2014, Vol. 39 Issue 2, p199-202. 4p.

مصطلحات موضوعية: *TILAPIA zillii, *BIOACCUMULATION in fishes, *DAMS, *COPPER in the body, *CADMIUM in the body

مستخلص: Given the importance of fish as a source of protein and the potential for exposure of humans to metal elements, metal bioaccumulation concentrations inTilapia zilliifrom four sites in the Badeni Dam on the Badeni River, Côte d'Ivoire, were analysed in March 2013. There were no significant differences between sites and therefore mean values for the impoundment as a whole were used to compare data with those from the literature. Comparative analysis showed elevated levels of manganese, iron, zinc, copper and cadmium from fish in this study. Due to the absence of human influence in the catchment area, these elevated levels are attributed to the unique geological characteristics of the catchment, compounded by the impoundment conditions. Further studies on fish condition to ascertain the effects of the elevated metal concentrations are recommended. [ABSTRACT FROM AUTHOR]

العنوان البديل: PARAZITOFAUNA PET SLATKOVODNIH RIBA U NIGERIJSKOM SLATKOVODNOM EKOSUSTAVU.

المؤلفون: Ejere, Vincent Chikwendu¹, Aguzie, Oscar Ifeanyi¹, Ivoke, Njoku¹, Ekeh, Felicia Nkechi¹, Ezenwaji, Ngozi Evelyn¹, Onoja, Uwakwe Simon², Eyo, Joseph Effiong¹ joseph.eyo@unn.edu.ng

المصدر: Croatian Journal of Fisheries. 2014, Vol. 72 Issue 1, p17-24. 8p.

مصطلحات موضوعية: *FRESHWATER fishes, *TILAPIA zillii, *FISH parasites, *PARASITOLOGY, *METAZOA

مصطلحات جغرافية: DELTA State (Nigeria)

الملخص (بالإنجليزية): The parasitic fauna of freshwater fishes of the Warri River, Delta State, Nigeria, with reference to their prevalence, intensity and differences in metazoan parasites between fish sexes, was investigated. A total of 85 fish samples comprising of 21 Tilapia zillii (Cichlidae: Perciformes), 23 Synodontis clarias (Mochokidae: Siluriformes), 23 Chrysichthys nigrodigitatus (Claroteidae: Siluriformes), 16 Hepsetus odoe (Hepsetidae: Characiformes) and 2 Clarias anguillaris (Clariidae: Siluriformes) collected from the Warri River, Delta State, Nigeria, were subjected to parasitological examination. The overall metazoan parasite prevalence was 32.9%. The metazoan parasites recovered were mainly the acanthocephalans: Neoechinorhynchus prolixum, Pomphorhynchus spp., Acanthocephalus spp. and unidentified acanthocephalan, and nematodes: Camallanus polypteri, Capillaria pterophylli, C. cichlasomae, Procamallanus laeviconchus, Philometroides africanus and Railletnema synodontis. Although the acanthocephalans constituted 75.6% and nematodes 22.2% of the parasites recovered, the nematodes had the highest prevalence (23.5%) compared to the acanthocephalans (9.4%). Similarly, variable prevalences were observed for the other metazoan parasite taxa recovered, namely trematoda; Clinostomum complanatum (1.2%), Leech; Pisciola geometra (2.4%) and Crustaceans (1.2%). The highest parasite prevalence (39.1%) was observed in S. clarias, while the least (23.8%) was observed in T. zillii. Generally, the prevalence of parasites was higher in female (35.7%) than in the males (31.6%), although statistically no significant difference was observed in the prevalence by sex (X2 = 0.145, P = 0.807). The relatively high overall parasite prevalence in fishes inhabiting the Warri River may be attributed to the relatively high level of pollution. [ABSTRACT FROM AUTHOR]

Abstract (Croatian): Ovo istraživanje bavi se proučavanjem parazitofaune slatkovodnih riba iz rijeke Warri u državi Delti u Nigeriji s obzirom na zastupljenost, intenzitet pojave i razlike u višestaničnim parazitima kod različitih spolova. Parazitološkom pregledu podvrgnuto je ukupno 85 jedinki ribe iz rijeke Warri u državi Delti u Nigeriji: 21 Tilapia zillii (Cichlidae: Perciformes), 23 Synodontis clarias (Mochokidae: Siluriformes), 23 Chrysichthys nigrodigitatus (Claroteidae: Siluriformes), 16 Hepsetus odoe (Hepsetidae: Characiformes) i dvije Clarias anguillaris (Clariidae: Siluriformes). Ukupna zastupljenost višestaničnih parazita bila je 32,9%. Otkriveni višestanični paraziti uglavnom su bili akantocefali, Neoechinorhynchus prolixum, Pomphorhynchus spp., Acanthocephalus spp., a isto tako i neidentificirani akantocefali i nematode, Camallanus polypteri, Capillaria pterophylli, C. cichlasomae, Procamallanus laeviconchus, Philometroides africanus i Railletnema synodontis. Među otkrivenim parazitima akantocefala je bilo 75,6%, a nematoda 22,2%, no usprkos manjem postotku, nematode su imale veću zastupljenost (23,5%) u usporedbi s akantocefalima (9,4%). Isto tako, praćena je i zastupljenost drugog višestaničnog parazitatrematoda (metilja): Clinostomum complanatum (1,2%), zatim pijavica (Leech); Pisciola geometra (2,4%) i račića (Crustaceans) (1,2%). Najveća zastupljenost parazita zabilježena je kod S. Clarias, a najmanja (23,8%) kod T. zillii. Sveukupno gledajući, zastupljenost parazita bila je veća kod ženki (35,7%) nego kod mužjaka (31,6%), iako statistički nema velike razlike u zastupljenosti parazita po spolu (X2 = 0,145, P = 0,807). Relativno visoka ukupna zastupljenost parazita kod riba može se pripisati relativno visokoj razini onečišćenja. [ABSTRACT FROM AUTHOR]

المؤلفون: Saleh, Jassim H.¹, Hamadany, Qusay H. Al¹, Matlak, Falah M.¹

المصدر: Basrah Journal of Agricultural Sciences. 2014, Vol. 27 Issue 1, p12-20. 9p.

مصطلحات موضوعية: *TILAPIA zillii, *BODY composition of fish, *TILAPIA, *PROTEINS, *FISH anatomy

مستخلص: This study explains the chemical composition and yield of edible part of Tilapia zilli which is in come to Iraqi water and were fished from Al-Dabab in south of Al- Hammar marsh. Fishes are divided to four parts as head, skin and bones, viscera and meat. The meat constituted high weighty ratio from another parts (49.60%). Chemical composition was counted for Tilapia zilli, protein (18.43%), fat (11.17%), moisture (66.54%) and ash (3.47%). Chemical composition was counted for every parts (head, skin and bones, viscera and meat) for Tilapia zilli. [ABSTRACT FROM AUTHOR]

المؤلفون: S. Fawzia, M. Magdy, M.A. Rashed, M.A. Essa, R.A. Ali, E.A. Badawy

المصدر: Egyptian Journal of Aquatic Research, Vol 42, Iss 3, Pp 313-318 (2016)

مصطلحات موضوعية: Tilapia zillii, F-DD, Cold stress, Fish adaptation, Molecular ecology, Aquaculture. Fisheries. Angling, SH1-691, Environmental sciences, GE1-350

الوصف: Fish can adapt to a wide range of temperature changes, however, the molecular mechanisms that underlie these adaptations are not fully understood. In this study, fluorescently labeled differential display (FDD) technique was used to detect mRNAs that are differentially expressed in hepatic tissues of Tilapia zillii fish subjected to a temperature reduction regime that combined both accelerated and stationary cold stresses. The two arbitrary primers (DD1 and DD2) with the Oligo d(T)23-C generated a total of 18 and 37 unknown messenger RNA (UMR) bands, respectively. Both DD1 & DD2 arbitrary primers with oligo d(T)23-C scored four stress-related unidentified fragments after refining. Using the two arbitrary primers with the Oligo d(T)23-G, a total of 371 and 372 UmRs were yielded, respectively. Both arbitrary primers scored nine stress-related unidentified fragments after refining. All UmR were tested for its correlation to time and temperature factors scaled for the current experiment, only four were found to be correlated for both factors. Thus, T. zillii responded to temperature reduction by adjusting the expression of a set number of genes that may be required for their adaptation and tolerance to low environmental temperature.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S1687428516300334Test; https://doaj.org/toc/1687-4285Test

الوصول الحر: https://doaj.org/article/2d5622dfd5864dd0bafe8375b189715cTest

المؤلفون: Mohamed M El-Shazly*

المساهمون: Peertechz Publications Pvt. Ltd.

المصدر: Global Journal of Ecology 4(1) 001-007

مصطلحات موضوعية: Nile river, Delta lagoons, Traces metals, Wetland degradation, Tilapia zillii, Phragmites austra-lis, Lake management

الوصف: The River Nile delta shallow lakes namely, Edku, Burullus and Manzala are natural wetland ecosystems, connected to fresh water sources at the south and to the open sea at the north. Throughout their relatively short geological and hydrological history, the lakes received unpolluted fresh water from the river Nile. Egyptians have begun practicing some form of water management for agriculture and transportation since about 5,000 years ago. As a result of agricultural and industrial development over the last century, the lagoons have been the end points of the last Egyptian use of the Nile water before flowing to the Mediterranean Sea; currently, the lakes receive fresh water from polluted drains inflow. In the present investigation, we studied some common characters of the lakes; including the accumulation of Cu, Zn, Cd, Pb, Mn, Fe, and Al in water, surface sediments, Tilapia zillii fish, and the common reed, Phragmites austrlis. Sampling was undertaken in May 2017. Six to 9 water samples were withdrawn from locations close to drains - lake and lake-sea connections for each of the three lakes. Surface sediments, tilapia fishes and P. australis specimens were sampled from three different localities along the southern edge of each of the studied lakes, where most of the anthropogenic activities occur. Analysis of variance (ANOVA) was carried out to compare the chemical properties of the water among the three lagoons. The lowest concentrations of all the tested metals were found in water, while the highest concentrations of the tested metals (except Zn) were detected in surface sediments. The highest concentration of Zn was found in tilapia fish muscles. However, the magnitudes of heavy metal concentrations in the living components of the lagoons (tilapia fish and the common reed) didn’t follow the same pattern as in the nonliving components (water and sediments). In situ measurements demonstrated pH values in the alkaline side. The horizontal salinity gradient between northern and southern edges of the lakes is ...

العلاقة: https://zenodo.org/record/2594799Test; https://doi.org/10.17352/gje.000008Test; oai:zenodo.org:2594799

الإتاحة: https://doi.org/10.17352/gje.000008Test
https://zenodo.org/record/2594799Test

المؤلفون: Coward, Kevin

مصطلحات موضوعية: 590, Tilapia, T. zillii, fecundity, spawning periodicity, ovarian, Fishes Reproduction, Tilapia zillii Spawning

الوصف: This study investigated several, previously little-known, aspects of reproductive physiology and endocrinology in the substrate-spawning cÌchlid Tilapia zillii; a tilapia that is becoming increasingly popular in world aquaculture. Studies were undertaken in controlled laboratory aquaria, thereby reducing the potential influence of environmental variation evident in many previous field studies of this species. Analysis involved two strains of T. zillii: strain 'A' (T. zillii) and strain 'B' (formerly known as Tilapia tholloni). Spawning periodicity and total fecundity generally increased with fish size. Egg size varied within a narrow window and did not generally increase with fish size though fish weighing 100 - 200g tended to produce the largest eggs. The best estimate of spawning periodicity was considered to be 'mean days elapsed/spawn' as this figure was based upon both spawning and non-spawning fish in an experimental group. Mean days elapsed/spawn increased with increasing fish size and averaged 61.4 days and 37.5 days in strains 'A' and 'B' respectively. The shortest reproductive cycles observed were just 7 days and 6 days for strains 'A' and 'B' respectively. Total fecundity ranged from 461 - 11640 eggs/clutch. Mean total fecundity was 3606+/-280 in strain 'A' and 3560+/-243 in strain 'B'. Mean egg diameter was 1.5+/-0.04mm and 1.4+/-0.08mm in strains 'A' and 'B' respectively. Fecundity and egg size also varied over successive spawns in serial-spawning females but these variations did not appear to be related to spawning periodicity. Regression analysis revealed strong relationships between fish size (weight and length) and total fecundity, relative fecundity and total egg volume. Relationships between fish size and egg size were generally much weaker. Fecundity and egg size were related to the length of the preceding inter-spawn-interval (ISI) in fish of certain weight categories but not others, providing limited evidence that length of ISI may in par, control fecundity and egg size in this species. Ovarian recrudescence was classified into ten distinct developmental stages based upon oocyte size, biochemical properties and structure. This classification scheme was comparable to classification schemes developed for other teleosts but represents the first detailed description of oocyte growth in a substrate-spawning tilapia. Radioimmunoassay and stereological analysis provided valuable and novel data concerning the dynamics of ovarian development in this species. Levels of 17ßoestradiol (E2) and testosterone (T) peaked within 6 days of spawning, suggesting that vitellogenesis began as early as day 2 or 3 post-spawning. By day 8, ovaries were dominated by large late-vitellogenic/maturing oocytes (stages 6 & 7) occupying 60 - 70% of the ovary. Gonadosomatic index (GSI) reached maximal levels by day 14. Since the proportion of stage 6/7 oocytes exhibited little change from day 8 onwards, it is suggested that pre-vitellogenic oocytes are recruited into vitellogenic growth immediately after spawning and complete vitellogenesis as early as day 8 postspawning. Analysis of serial-spawning fish found that initial post-spawn E2 and T peaks (on days 2 - 6) were much lower after the second spawning. Sex steroid levels were also found to be suppressed in confined T. zillii (i.e. where stocking densities were > lOkg/m3). Confined females failed to spawn but displayed a marked tendency to do so after transfer to individual aquaria. Serum E2 and T were suppressed during confinement but increased rapidly following transfer to individual aquaria (coincident with resumed spawning activity). It is suggested that levels of E2 and T under confinement are not sufficient to allow completion of vitellogenic growth and are most probably suppressed via a pheromonal mechanism. Finally, the present study investigated the effect of prolonged food restriction on various aspects of reproduction. T. zillii were rationed from first feeding and throughout the following 17 months. Despite very large differences in fish size, no significant differences were detected in total fecundity, egg diameter nor total egg volume once data had been adjusted for differences in fish size. These data suggest that despite very large differences in food availability throughout the periods of sexual differentiation and on-growing, investment in reproduction remained relatively consistent. It appeared that during food restriction, T. zillii sacrificed body weight and growth so as to maintain reproductive investment. In summary, this study provides valuable and novel information regarding the reproductive physiology and endocrinology of female T. zillii and suggests that this species may be a suitable 'model' species for future work on fecundity and ovarian development.

الوصول الحر: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244644Test

المؤلفون: Hadi, A. A.¹, Alwan, S. F.² alwan_sami2005@yahoo.com

المصدر: International Journal of Pharmacy & Life Sciences. Nov2012, Vol. 3 Issue 11, p2071-2081. 11p.

مصطلحات موضوعية: *TILAPIA zillii, *HISTOPATHOLOGY, *GILLS, *ALUMINUM, *CONTROL groups

مستخلص: The present study was carried out to study gills, liver and kidney histopathology in the freshwater fish, Tilapia zillii which exposed to three levels of aluminum (25, 50, and 100 μg/L) for 96 hour in acidic soft water (pH 6.0). Several histopathological changes were observed in fish organs would serve useful purpose in evaluating the toxic effects of aluminum. Histopathological changes in gills, Liver and kidneys observed microscopically showed increasing degrees of damage in the tissues in correlation with the concentration of aluminum, while gills, liver and kidneys of control groups exhibited a normal architecture. [ABSTRACT FROM AUTHOR]

العنوان البديل: التخصص والتداخل الغذائي بين نوعين دخيلين (Carrasius auratus and Tilapia zilli) وسمكة الحمري المحلية (Barbus luteus) في هور شرق الحمار، جنوب العراق

المؤلفون: Al-Lamy, Jinan Hassan¹, Resen, Amjed Kadhum¹, Taher, Majid Makky¹, Muhammed, Sadiq Jawad²

المصدر: Journal of King Abdulaziz University: Marine Sciences. 2012, Vol. 23 Issue 2, p25-37. 13p.

مصطلحات موضوعية: *TILAPIA zillii, *INTRODUCED species, *BARBUS, *DIET

مصطلحات جغرافية: IRAQ

الملخص (بالإنجليزية): Total number of 74 Barbu luteus, 96 Carassius auratus, and 108 Tilapia zilli were fished from East Hammar Marsh during October 2010 to July 2011. Ten food items found in the diet of B. luteus, the most important item was filament algae (75.2%) followed by higher plants (15.6%) and then by diatom (5.7%). Seven food items found in the diet of C. auratus, the most important item was filament algae (90%) followed by higher plants (5.77%) and then by diatom (1.97%). Six food items found in the diet of T. zilli, the most important item was higher plants (67.3%) followed by filament algae (18.9%) and then by eggs (12.8%). It was found that studied species are herbivorous fed mainly on plant materials that consist 96%, 98% and 87% of all food items for B. luteus, C. auratus and T. zilli respectively. It was found that B. luteus and C. auratus are high specialized feeders (0.17, 0.11 respectively), while T. zilli is low specialized feeder (0.31). Medium feeding overlap (0.69) was found between B. luteus and C. auratus, while low feeding overlap were found between T. zilli and both species, B. luteus (0.25) and C. auratus (0.21). [ABSTRACT FROM AUTHOR]

الملخص (بالعربية): تم اصطياد ٧٤ سمكة حمري (Barbu luteus) و٩٦ سمكة كارب بروسي (Carassius auratus) و١٠٨ سمكة بلطي زيلي (Tilapia zilli) من هور شرق الحمار خلال الفترة الممتدة من شهر تشرين الأول ٢٠١٠م إلى شهر تموز ٢٠١١م. تبين من فحص الغذاء وجود عشرة أنواع من الأحياء في أسماك الحمري ولكن أكثرها أهمية الطحالب الخيطية (٧٥.٢%) ومن ثم النباتات العليا (١٥?) والدايتومات (٥.٧٥%)، بينما وجدت سبعة أنواع في غذاء الكارب البروسي وأكثرها أهمية الطحالب الخيطية (٩٠%) ثم النباتات العليا (٥.٧٧%) والدياتومات (١.٩٧%)، في حين وجدت ستة أنواع في غذاء أسماك البلطي الزيلي وأكثرها أهمية النباتات العليا (٦٧.٣%) يليها الطحالب الخيطية (١٨.٩%) والبيض (١٢.٨%). أثبتت الدراسة الحالية أن الأسماك المدروسة هي نباتية التغذية تتغذى بشكل رئيسي على المواد الغذائية نباتية الأصل والتي تشكل ٩٦% و٩٨% و٨٧% من غذاء أسماك الحمري والكارب البروسي والبلطي الزيلي بالتعاقب. تبين أيضًا من النتائج أن سمكتي الحمري والكارب البروسي ذاتا تخصص غذائي عالي (٠.١٧ و٠.١١ بالتعاقب)، بينما سمكة البلطي النيلي ذات تخصص غذائي واطئ (٠.٣١). أثبتت الدراسة الحالية أن معدل التداخل الغذائي كان متوسطًا (٠.٦٩) بين أسماك الحمري والكارب البروسي، بينما كان التداخل منخفضًا بين البلطي الزيلي وكل من الحمري (٠.٢٥) والكارب البروسي (٠.٢١). [ABSTRACT FROM AUTHOR]

المؤلفون: Pan, Bing-Qing¹, Su, Wen-Jin¹, Cao, Min-Jie¹, Cai, Qiu-Feng¹, Weng, Wu-Yin¹, Liu, Guang-Ming gmliu@jmu.edu.cn

المصدر: Food Chemistry. Jan2012, Vol. 130 Issue 1, p127-133. 7p.

مصطلحات موضوعية: *TILAPIA zillii, *IMMUNOGLOBULIN E, *COLLAGEN, *ALLERGENS, *PRECIPITATION (Chemistry), *EXTRACTION (Chemistry), *ENZYME-linked immunosorbent assay, *IMMUNOBLOTTING

مستخلص: Abstract: Acid-soluble collagen (ASC) was isolated from the skin of tilapia (Tilapia zillii) via acetic acid (HAc) extraction and NaCl precipitation. ASC from tilapia consists of α chains (α1 and α2), β chains and γ chains and is classified as type I collagen. A comparison of the properties of tilapia collagen and silver carp parvalbumin showed that tilapia collagen was less stable under heat treatment and more resistant to pepsin digestion. Both tilapia collagen and silver carp parvalbumin were degraded at pH 2.0 but stable at pH 3.0–11.0. Subunits α1 and α2 were further purified from tilapia collagen by carboxymethyl (CM) cellulose column chromatography with linear gradient elution and stepwise elution, respectively. Enzyme-linked immunosorbent assay (ELISA) and immunoblotting results demonstrated the specific IgE activity of different fish-allergenic patients’ sera towards the α1 and α2 chains of tilapia collagen. It can be inferred that tilapia collagen and its subunits are all potential allergens. [Copyright &y& Elsevier]

المؤلفون: Szitenberg, Amir, Goren, Menachem, Huchon, Doroth�¹ huchond@post.tau.ac.il

المصدر: BMC Research Notes. 2012, Vol. 5 Issue 1, p172-179. 8p. 3 Diagrams, 4 Charts.

مصطلحات موضوعية: *TILAPIA zillii, *MITOCHONDRIA, *PONDS, *FISHERIES, *HABITATS

مصطلحات جغرافية: ISRAEL

مستخلص: Background: Tilapia zillii is widespread in the East Levant inland aquatic systems as well as in artificial water reservoirs. In this study we explore the genetic and morphological variation of this widespread species, using mitochondrial control region sequences and meristic characters. We examine the hypothesis that T. zillii's population structure corresponds to the four Israeli aquatic systems. Results: Out of seven natural water bodies, only two were found to possess genetically divergent populations of T. zillii. In addition to its presence in fish farms, the species was found in two artificial recreational ponds which were supposed to have been stocked only with other fish species. In these two artificial habitats, the haplotype frequencies diverged significantly from those of natural populations. Finally, fish from the Dead Sea springs of Ne'ot HaKikar appear to differ both genetically and morphologically from fish of the same aquatic system but not from fish of other water systems. Conclusions: Our results show that the population structure of T. zillii does not match the geography of the Israeli water-basins, with the exception of the Dead Sea and Kishon River, when considering natural populations only. The absence of a significant divergence between basins is discussed. Our results and observations suggest that the Ne'ot HaKikar Dead Sea population and those of artificial ponds could have originated from the "hitchhiking" of T. zillii, at the expense of some other cultivated tilapiine species [ABSTRACT FROM AUTHOR]