المؤلفون: Abumandour, Mohamed M. A.

المصدر: Anatomia, Histologia, Embryologia: Journal of Veterinary Medicine Series C; Jan2019, Vol. 48 Issue 1, p12-21, 10p

مصطلحات موضوعية: GILLS, TASTE buds, NILE tilapia, TILAPIA zillii, CARP

مستخلص: The present investigation was designed to describe the surface ultrastructure of the gill system of tilapia Zilli. The gill system is formed from four gill arches and each gill arch carries a row of gill filaments on its convex border and two rows of the gill rakers on its concave border. The quadrilateral interbranchial septum has elevated part at the level of the third gill arch. By SEM observations, the gill arch was divided into three regions: rostral, middle and caudal region. The caudal region contained two characteristic structures: oval leaf‐like structure and rounded‐shaped structure. Each oval leaf‐like structure carried two lateral rows of the triangular pointed spines separated by a median groove. All surfaces of gill arches, rakers and filaments were covered with a mosaic of the polygonal pavement cells, in addition to the opening of chloride cells and mucous cells. The gill arch and gill raker had only one appearance of taste buds named type I. Meanwhile, the filaments contained two types of different appearance of the taste buds named: type I and type II. Type I was the main common and similar to that present in gill arch and raker and characterized by its blunt end, while type II had hair‐like structures that projected from the volcano‐shaped depression. The gill rakers were formed from central axis surrounded by two lateral lobulated regions which carry pointed spines, taste buds and the opening of chloride cells. The surface of triangular lower pharyngeal jaw carries numerous teeth‐like papillae which originated from the socket‐like depression. [ABSTRACT FROM AUTHOR]

: Copyright of Anatomia, Histologia, Embryologia: Journal of Veterinary Medicine Series C is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Audu, B. S., Yusuf, S., Malachy, N. O. A., Jamiu, O., Wade, J. W.

المصدر: Science World Journal; 2018, Vol. 13 Issue 4, p16-20, 5p

مصطلحات موضوعية: PHYTOCHEMICALS, HENNA (Plant), TILAPIA zillii

مستخلص: The high cost of conventional anesthetics and the deleterious effects of prevailing chemical sedatives used in aquaculture have justified the search for natural plant alternative that is cosmopolitan, biodegradable, less toxic with short withdrawal period, and economically affordable. The Phytochemical, proximate and sedative properties of the aqueous crude leaf extract of Lawsonia inermis and its effect on the opercula ventilation rate in Tilapia zilli fingerlings were conducted using standard procedures. Mixed sexed fingerlings of T. zilli of mean weight and length of 42.64 ± 0.82 g and 11.14 ± 0.22 cm respectively were randomly distributed in batches of five fish/per experimental tank. The tank with no test material (0.00g/L) served as the control; while, tanks with test materials at concentrations of 1.50, 2.00, 2.50, 3.00 and 3.50g/L served as test tanks. The qualitative phytochemical analyses of L. inermis revealed the presence of varying proportions of alkaloid, tannin, saponins, cardiac glycosides phenolic and resins, while, the proximate composition includes moisture content (33.2%), crude lipid (12.0%), ash (29.9%), crude fibre (21%), crude protein (3.38%) and nitrogen free extracts (0.52%). There was significant (p<0.05) dose- dependent increase in the induction of sedation and recovery time of T. zilli exposed to L. inermis aqueous crude Leaf extract as well as marked dose-related decrease in the opercula ventilation rate compared to the control group. No mortality was recorded at low concentrations of 1.50-2.50g/L of the plant extract; in contrast with 50 and 100% mortalities in concentrations of 3.00 and 3.50g/L respectively. In conclusion, the present investigation revealed that L. inermis aqueous crude leaf extract seemed to contain diverse phytochemical constituents that caused sedation with adverse consequences on fish opercula ventilation. [ABSTRACT FROM AUTHOR]

: Copyright of Science World Journal is the property of Science World Journal and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Wei LUO, Xi GAN, Jiajie ZHU, Qiuwei AO, Yun TAN, Ming CHEN, Yongju LUO

المصدر: Agricultural Biotechnology (2164-4993); Oct2018, Vol. 7 Issue 5, p136-142, 7p

مصطلحات موضوعية: NILE tilapia, IMMUNOSTAINING, TILAPIA, SAROTHERODON, TILAPIA zillii, FISH diseases

مستخلص: [Obbectives] This study aimed to determine the infection pathway and taget organs of Streptocoocus agalactia! in GIFT strain of Nile tilapia, thus providing theoretical basis for the breeding of disease-resistant tilapia and development of S. agalactiae vaccines. [Methods] GIFT strain of Nile tilapia was inoculated by S. agalactia! through intraperitoneal injection, oral gavage and in vitro immersion. The giil, spleen, liver and small intestine tissues of infected tilapia were collected for pathomorphological observation. Immunohistochemical localization was conducted using rabbit anti-S. agalactiae serum to identify the distribution pattern of S. agalactiae in various tiisues of tilapia and its taget organs via diiferent infection pathways. [Results] GIFT strain of Nile tilapia could be infected by S. agalactiae via three artificial inoculation modes. SpecificHy, pathological changes occurred at 2 h post-inoculation in intraperitoneal injection and oral gavage groups, whereas tilapia in in vitro immersion group showed pathological changes at 5 h post-inoculation, and the lesion intensity in in vitro immersion group was slighter than that in intraperitoneal injection and oral gavage groups. Immunohistochemical localization indicated that the appearance time of positive signals in intraperitoneal injection group demonstrated an order of spleen--diver and giil--•smaH intestine; positive signals in oral gavage group appeared in the order of smaH intestine--»gill and spleen--diver; the appearance time of positive signals in in vitro immersion group showed an order of giil--• spleen--• liver and smaH intestine. [Conclusions] GIFT strain of Nile tilapia could be infected by S. agalactiae via intraperitoneal injection, oral gavage and in vitro immersion. The corresponding positive signas for pathogen infection were preferentiaHy present in the spleen, intestine and giil tiisues. Thus, preventing S. agalactiae contamination in aquaculture water and food sources is an efective measure to control the outbreak of S. agalactiae infections in tilapia under natural aquaculture conditions. [ABSTRACT FROM AUTHOR]

: Copyright of Agricultural Biotechnology (2164-4993) is the property of WuChu (USA - China) Science & Culture Media Corporation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Mabrok, Mahmoud Abd Elaziz, Wahdan, Ali

المصدر: Aquaculture International; Aug2018, Vol. 26 Issue 4, p1147-1160, 14p

مصطلحات موضوعية: OREGANO, ESSENTIAL oils, INTRAPERITONEAL injections, VIBRIO anguillarum, NATURAL immunity, TILAPIA zillii

مستخلص: The current study aimed to evaluate the possible effect of Origanum essential oil on innate immune parameters as well as the hematological profiles of Tilapia zillii following challenge with Vibrio anguillarum. Fifty-four of Tilapia zillii weighing 180 ± 10.2 g were randomly distributed into three identical closed recirculating seawater systems. The study included three groups (G1, G2, and G3) repeated in triplicates. Fish of the first two groups were fed on a basal diet without herbs, whereas fish of the last group were fed on a basal diet supplemented with Origanum essential oil at concentration 1 g kg⁻¹ for 15 days. Subsequently, fish of G2 and G3 subjected to a peritoneal inflammation by intraperitoneally injecting V. anguillarum (5.5 × 10⁵ CFU mL⁻¹), whereas fish of G1 injected with saline and served as control. Fish of all groups were then sampled at 4, 12, and 24 h post injection. No mortalities were observed in both basal and Origanum fed groups. However, some specimens of fish fed basal diet showed dorsal fin erosions, eroded mouth, and detached skin. Although the kinetics of RBCs, WBCs, Hb, and differential leukocyte values remained unchanged in fish fed different diets at the beginning of the trial, significant increases in those values were observed in fish fed Origanum essential oil at 12 and 24 h post injection. Similarly, an augmentation of plasma proteases, antiproteases, and lysozyme activities were recorded in fish fed Origanum essential oil at the same particular sampling points. A significant enhancement in plasma bactericidal capacity was only recorded in fish fed Origanum essential oil at 12 and 24 h post challenge compared to those fed basal diet. In conclusion, Origanum essential oil had a pronounced influence on the innate immunity and increased the fish resistance to V. anguillarum. These data gave insight into the potential use of Origanum in prophylactic strategies against threatening pathogens. [ABSTRACT FROM AUTHOR]

: Copyright of Aquaculture International is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Mwanja, WilsonWaiswa¹ (AUTHOR) wwmwanja@yahoo.com, Kaufman, Les² (AUTHOR), Fuerst, PaulA.³ (AUTHOR)

المصدر: Aquatic Ecosystem Health & Management. Oct-Dec2010, Vol. 13 Issue 4, p442-450. 9p. 2 Diagrams, 4 Charts, 1 Map.

مصطلحات موضوعية: *CICHLIDS, *TILAPIA zillii, *NILE tilapia, *ANIMAL diversity, *FISH genetics

مصطلحات جغرافية: LAKE Victoria, EAST Africa

مستخلص: The impact of introduced tilapiines in Lake Victoria Region (LVR) was studied using experimental fishing survey methods and microsatellite DNA marker analysis. The experiments were carried out between 1993 and 2000. Oreochromis esculentus and O. variabilis, the two native forms of the LVR and original principals of the fisheries of these waters, were found to be completely displaced from the major lakes and were only occasionally found in a few minor satellite lakes surrounding Lakes Kyoga and Victoria. Nile tilapia, O. niloticus, is now the dominant tilapiine, and one of the three key fisheries species of LVR along with Nile perch, Lates niloticus, and the minnow-like Rastrineobola argentea. Oreochromis leucostictus, also introduced to the LVR from the nilotic system, was largely restricted to swampy fringes of LVR water bodies. Tilapia zillii, also introduced from nilotic waters and earlier recorded to have been the most prevalent introduced tilapiine in LVR, occurred only sparsely and was very restricted in distribution. Genetic studies showed Nile tilapia having the highest genetic diversity, and being the least subdivided among LVR tilapiines. O. leucostictus was next in variability, but had the greatest gene flow, probably due to its ability to traverse low oxygen waters such as swamps which separate most LVR water bodies. The native forms were genetically the least variable, except where they coexist with introduced congeners. 'Uncontaminated' native forms were observed only in satellite Lakes of Kayanja, Kayugi, Manywa, Kawi and Kanyaboli. The population structure of native forms of LVR suggest they are being genetically swamped, especially for O. variabilis by Nile tilapia alleles, due to genetic exchange with introduced forms, resulting in highly localized differentiation of native species. T. zillii was equally highly subdivided, but has higher genetic variation within subpopulations, a situation linked to monogamous breeding behaviour which allows most individuals of its population to participate in breeding. Hybridization with T. rendalli, which was only occasionally encountered and previously mistaken for dwarf Nile tilapia, may also contribute to high within population variation in small T. zillii populations. On a macro-evolutionary level, the sister relationship between O. niloticus and O. esculentus is questionable and in need of further phylogenetic analysis. Overall the study showed a changed fishery, and the need to manage satellite lakes in a manner that will preserve the previous premier elements of the region's fishery (O. esculentus and O. variabilis) within natural refugia. [ABSTRACT FROM AUTHOR]

المؤلفون: Kinaro, Zachary Omambia^1,2 (AUTHOR), Xue, Liangyi^1,3 (AUTHOR) xueliangyi@nbu.edu.cn, Volatiana, Josies Ancella¹ (AUTHOR)

المصدر: Mitochondrial DNA. Part A. Jul2016, Vol. 27 Issue 4, p2455-2457. 3p. 1 Diagram.

مصطلحات موضوعية: *TILAPIA zillii, *MITOCHONDRIAL DNA, *FISHES, *FISH phylogeny, *NUCLEOTIDE sequencing, *TRANSFER RNA, *RIBOSOMAL RNA

مستخلص: The Cichlid fishes have played an important role in evolutionary biology, population studies and aquaculture industry with East African species representing a model suited for studying adaptive radiation and speciation for cichlid genome projects in which closely related genomes are fast emerging presenting questions on phenotype–genotype relations. The complete mitochondrial genomes presented here are for two closely related but eco-morphologically distinct Lake Victoria basin cichlids,Oreochromis variabilis, an endangered native species andTilapia zilli, an invasive species, both of which are important economic fishes in local areas. The complete mitochondrial genomes determined forO. variabilisandT. zilliare 16 626 and 16,619 bp, respectively. Both the mitogenomes contain 13 protein-coding genes, 22 tRNAs, 2 rRNAs and a non-coding control region, which are typical of vertebrate mitogenomes. Phylogenetic analyses of the two species revealed that though both lie within family Cichlidae, they are remotely related. [ABSTRACT FROM AUTHOR]

المؤلفون: Coward, K. kevin.coward@pharm.ox.ac.uk, Bromage, N.R.¹

المصدر: Aquaculture. Sep2002, Vol. 212 Issue 1-4, p383. 19p.

مصطلحات موضوعية: *TILAPIA zillii, *FISHERIES, *REPRODUCTION

مستخلص: We discuss the use of stereology in fisheries research and by presenting novel data, along with comparisons to conventional methodology, further confirm the effectiveness of a point-counting method that estimates the relative distributions of oocyte developmental stages within an asynchronous ovary. Point-counting methodology was applied in three experiments involving the ovaries of Tilapia zillii (Gervais), a teleost that exhibits highly asynchronous ovarian development. Quantitative data were first obtained from conventional digestion of ovarian tissue with mercury-based Gilson''s Fluid and compared to that derived from stereology. Analysis of covariance demonstrated no significant difference (P≥0.05) between counts of discrete oocyte developmental stages determined by either method. However, counts of post-ovulatory follicles (POFs) using Gilson analysis were not possible, due to the highly irregular size and shape of these structures. A second experiment compared an immediately post-spawned ovary with an ovary 5 days after spawning, presenting comparative data determined by stereology and Gilson digestion; on this occasion, Gilson analysis significantly underestimated the proportion of atretic ooytes (P<0.05). A further experiment forms a preliminary investigation of the effect of intra-muscular injections of human chorionic gonadotropin (hCG) upon early ovarian recrudescence and is presented as an example to demonstrate the highly informative nature of stereological analysis; injections of hCG on 3 days after spawning resulted in a significant decrease of stage 5 (early vitellogenic) but significant increase of stage 6 (late vitellogenic/maturing) oocytes by day 5. We conclude that point-counting stereology is a powerful technique for the quantitative analysis of ovarian development. Moreover, stereology avoids the prolonged use of dangerous mercury-based solutions and classifies oocytes into discrete developmental stages using a combination of criteria (biochemical, histological and size distribution) and not simply oocyte size. [Copyright &y& Elsevier]

المؤلفون: Ubangha, Olaleye Ig, Ndome Cb

المصدر: International Journal of Fisheries and Aquatic Studies. 9:234-238

مصطلحات موضوعية: Eleotridae, Schilbe, Eleotris, Mugil, Chrysichthys, Citharichthys, Zoology, Schilbeidae, Tilapia zillii, Biology, biology.organism_classification

الوصف: A study of the fish status of Kwa falls water body was carried out for three months (August-October) and a total of 562 fish representing 12 species belonging to 11 genera from 10 families and 6 orders were sampled. The family Clariidae was represented by Clarias gariepinus, Cichlidae by 2 species: Oreochromis niloticus and Tilapia zillii, Mockokidae by Synodontis omias and Schilbeidae by Schilbe uranoscopus. Claroteidae by 2 species: Chrysichthys nigrodigitatus and Chrysichthys longipinnis, Mugilidae by Mugil falcipinnis. The rest includes Paralichthyidae (Citharichthys stamflii), Characinidae (Sarcodaces odoe), Eleotridae (Eleotris vittata) and the Cyprinidae (Barilius niloticus). Siluriformes and Perciformes were the most abundant orders accounting for 72.2% and 14.8% of the total landings respectively while the species Chrysichthys nigrodigitatus (313), C. longipinnis (72) and Oreochromis niloticus (56) dominated the overall catch constituting 87.5%. Monthly differentiation in the diversity indices revealed higher values for the month of October than the month of August and September. The Shannon-wiener index (H’) obtained were within the range of 0.75 to 1.74 and showed significant difference between reaches, with downstream reaches having higher diversity throughout the sampling period. Equitability values (E) were generally low in all the reaches sampled. The spatial and seasonal differences were significant at p

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::b0c0b903d3661dfbba07a3ab0354972cTest
https://doi.org/10.22271/fish.2021.v9.i4c.2541Test

المؤلفون: Mohammed Jr. Kinta, A. V. Ayanwale, Unique N. Keke, Y. I. Auta, B. S. Adama, H. Usman

المصدر: FUDMA JOURNAL OF SCIENCES. 5:223-232

مصطلحات موضوعية: Biochemical oxygen demand, biology, Aquatic ecosystem, Alkalinity, Tilapia zillii, Total dissolved solids, biology.organism_classification, chemistry.chemical_compound, Oreochromis, Nitrate, chemistry, Environmental chemistry, Environmental science, Synodontis clarias

الوصف: Developing countries like Nigeria are faced with increased in generation of domestic, industrial and agricultural wastes, with a large percentage moving. This study evaluates the physico-chemical and some heavy metals concentration in three common species of fish from Tungan Kawo reservoir Kontagora, Nigeria; using standard methods between (July 2018 – February 2019); at four different sampling stations of human activities on the water. Five heavy metals were evaluated (Lead, Copper, Manganese, Iron and Chromium) in the fish samples. Phosphate (0.4 – 2.5) mg/L, Nitrate (3.2 – 7.5) mg/L, Temperature (27 – 32.4) 0C, Dissolved Oxygen (2.4 – 5.2 mg/L), Conductivity (81 – 125 µS/cm), Biochemical Oxygen Demand (1.9 – 4.4 mg/L), Alkalinity (mg/L) and Total Dissolved Solids (117 – 198) ppm were within the standard for drinking water and survival of fish. However, the pH (6.3 – 9.8) was above the standard for NIS and WHO drinking water but can support aquatic life. Iron (0.64 ± 0.072 mg/kg) was the most highly concentrated in Synodontis clarias while lead (0.01 ± 0.013 mg/kg) was the lowest in Oreochromis niloticus and Coptidon zillii (formerly Tilapia zillii. This current finding indicates that the water is safe for both aquatic life and domestic purpose but not suitable for direct human consumption without being properly treated. However, there is the need for regular monitoring of the heavy metals load in this water body and the aquatic organisms because of the long term effects

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::fb659581514c3a3aa453991663279eb6Test
https://doi.org/10.33003/fjs-2021-0501-559Test

المؤلفون: Ahmed Y. H. Elwasify

المصدر: Egyptian Journal of Aquatic Biology and Fisheries. 25:695-711

مصطلحات موضوعية: Gill, Veterinary medicine, Fish liver, Cichlid, Bioaccumulation, Fish , Bioconcentration, Heavy metals, Tilapia zillii, Aquatic Science, Biology, biology.organism_classification

الوصف: The present study was aimed to investigate the bioaccumulation and biosedimentation factors of some heavy metals in Tilapia zillii inhabiting Lake Qarun, Egypt during the year, 2015- 2016. Water, sediments and fish samples were collected during the period of study. The present study exhibited that, the higher levels of bioaccumulation and biosedimentation factors were recorded in liver samples except for Mn; gills showed their high accumulation while the lower levels of all studied metals were observed in muscle samples. The results indicated the differences of some heavy metals accumulation in different tissues of fish with an increasing rate in the liver during winter and spring except for Zn that attained the higher level in the liver during autumn for bioaccumulation factor and spring for biosedimentation one. The liver of T. zillii accumulated higher levels of Cd, Cu, Fe and Zn than other organs. The results showed that the bioaccumulation factor of Cd, Fe and Mn in fish organs was greater than biosedimentation factor, and this implies that the fish bioaccumulated these metals from the water. While, biosedimentation factor of copper and zinc in the fishes was higher than bioaccumulation one, and this refers to the fact that the fishes bioaccumulated these metals from the sediment. Histopathologically results showed congestion in the interstitial blood vessel and multifocal necrotic areas in renal tubules. While, vacuolated hepatocytes, dilated central vein, compressed blood sinusoids, and congestion were seen in fish liver. Furthermore, intermuscular edematous areas between the muscle bundles were obvious. The increased rate of bioaccumulation, biosedimentation factors, and histopathological changes in the target organs indicated the high risk to fish health and human consumption. Thus, the current study showed that precautionary measures should be taken to prevent heavy metal pollution in the future.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::e5d8e620c86099d107753521990d1117Test
https://doi.org/10.21608/ejabf.2021.180680Test