scholarly journals Identifying Nile tilapia strains and their hybrids farmed in Brazil using microsatellite markers

2016 ◽  
Vol 51 (10) ◽  
pp. 1744-1750 ◽  
Author(s):  
Rafael Antunes Baggio ◽  
Raphael Orélis-Ribeiro ◽  
Walter Antonio Boeger
Keyword(s):  
Oreochromis Niloticus ◽  
Bayesian Model ◽  
Nile Tilapia ◽  
Southern Brazil ◽  
Clustering Method ◽  
Fish Farms ◽  
Model Based Clustering ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Uruguay River ◽  
Reference Strains

Abstract: The objective of this work was to evaluate a Bayesian model-based clustering method to identify the strains of Nile tilapia (Oreochromis niloticus) individuals from fish farms in Southern Brazil. Assignment methods using nine microsatellite loci were applied to differentiate individuals of five reference strains (GIFT, GST, Nilótica, Chitralada, and Saint Peter) and to identify individuals of unknown strains from fish farms near the Itaipu reservoir and in the Uruguay River basin. The procedure assigned the correct strain in more than 90% of the cases and was also able to detect hybrids between strains. The obtained results showed that several fish farms in Southern Brazil cultivate more than one tilapia strain and even interstrain hybrids. The proposed methodology is a reliable tool for the identification of the strain origin of Nile tilapia individuals.

Introduction of jundia Rhamdia quelen (Quoy & Gaimard) and Nile tilapia Oreochromis niloticus (Linnaeus) increases the productivity of carp polyculture in southern Brazil

2008 ◽  
Vol 39 (5) ◽  
pp. 542-551 ◽  
Author(s):  
Leonardo Bolognesi da Silva ◽  
Leonardo José Gil Barcellos ◽  
Rosmari Mezzalira Quevedo ◽  
Silvia Maria Guimarães de Souza ◽  
Alexandre de Mello Kessler ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Southern Brazil ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Rhamdia Quelen

scholarly journals First report of Trichodinella and new geographical records of trichodinids in Nile tilapia (Oreochromis niloticus) farmed in Brazil

2019 ◽  
Vol 28 (2) ◽  
pp. 229-237
Author(s):  
Fabrício Sado Rodrigues ◽  
Inácio Mateus Assane ◽  
Gustavo Moraes Ramos Valladão ◽  
Fernanda Gomes de Paula ◽  
Caniggia Lacerda Andrade ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
First Record ◽  
The Body ◽  
Western Region ◽  
Morphometric Characteristics ◽  
Fish Farms ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Protozoa Ciliophora ◽  
Serious Disease

Abstract Massive occurrence of trichodinids is frequently accompanied by serious disease in fish farms. In this study, trichodinid species from the gills and skin of Nile tilapia (Oreochromis niloticus) farmed in the central-western region of Brazil (state of Goiás) were morphologically characterized. Dried slides were prepared from the parasites and were impregnated with silver nitrate (2%). Morphometric characteristics were determined and schematic drawings of the denticles were made using photomicrographs produced from the slides. Seven species of trichodinid ectoparasites (Protozoa: Ciliophora: Trichodinidae) were found parasitizing the gills: four of the genus Trichodina Ehrenberg, 1838; one of Tripartiella Lom, 1959; one of Paratrichodina Lom, 1963; and one of Trichodinella Ṧrámek-Huṧek, 1953. On the body surface, three specimens of the genus Trichodina were identified. This study presents new geographical records of trichodinids in Brazil, thus confirming that Trichodina centrostrigeata, Trichodina compacta, Trichodina heterodentata, Paratrichodina africana and Tripartiella orthodens are widely distributed worldwide. Additionally, the first record of the genus Trichodinella in Brazil is presented.

scholarly journals Protozoan and metazoan parasites of Nile tilapia Oreochromis niloticus cultured in Brazil

2012 ◽  
pp. 2812-2819 ◽  
Author(s):  
Wanderson Pantoja MF ◽  
Ligia Neves R ◽  
Márcia Dias RD ◽  
Renata Marinho GB ◽  
Daniel Montagner ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Condition Factor ◽  
First Record ◽  
The State ◽  
Parasitic Infections ◽  
Fish Farms ◽  
Metazoan Parasites ◽  
Relative Condition Factor ◽  
Nile Tilapia Oreochromis Niloticus

ABSTRACTObjective. This study describes the parasitic fauna and relative condition factor (Kn) in Nile tilapia Oreochromis niloticus L. (Cichlidae) from fish farms in the State of Amapá. Material and methods. 123 fish from four fish farms in the state of Amapá, Brazil were necropsied for parasitological and Kn analysis. Results. 64.2% of the examined fish, had the gills infected with Cichlidogyrus tilapiae Paperna, 1960 (Monogenoidea: Dactylogyridae); Ichthyophthirius multifiliis Fouquet, 1876 (Protozoa: Ciliophora), Trichodina Ehrenberg, 1830 and Paratrichodina africana Kazubski & El-Tantawy, 1986 (Protozoa: Trichodinidae). The highest prevalence found corresponded to Monogenoidea C. tilapiae while the lowest corresponded to Trichodinidae. However, I. multifiliis was the parasite that presented the greatest intensity and abundance. The differences found in the infection rates of the different fish farms due to causes further discussed. The parasitism did not influence the relative condition factor (Kn) of fish. This was the first record of P. africana in Brazil and occurred in the Eastern Amazon. Conclusions. In Brazil, Lamproglena sp. is an emerging parasite in the Southern and Southeastern regions, but this crustacean was not found in the Nile tilapia in the State of Amapá. The parasitic infections in Nile tilapia farmed in Brazil are caused by protozoan, monogenoidea, crustacea and digenea species, and the regional differences on their prevalence and intensity rates are discussed in this study.

scholarly journals Complete Genome Sequence of Streptococcus iniae UEL-Si1, Isolated in Diseased Nile Tilapia (Oreochromis niloticus) from Northern Paraná, Southern Brazil

2017 ◽  
Vol 5 (2) ◽  
Author(s):  
Laurival A. Vilas-Boas ◽  
Selwyn A. Headley ◽  
Kátia B. Gonçalves ◽  
Josiane A. Scarpassa ◽  
Lucienne G. Pretto-Giordano
Keyword(s):  
Infectious Disease ◽  
Complete Genome Sequence ◽  
Oreochromis Niloticus ◽  
Complete Genome ◽  
Nile Tilapia ◽  
Streptococcus Iniae ◽  
Southern Brazil ◽  
Content Type ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Disease Agent

ABSTRACT The Streptococcus iniae UEL-Si1 strain was isolated from diseased Nile tilapia within the Paranapanema River Basin, Northern Paraná, Brazil. This is an emerging infectious disease agent of fish from Brazil, and sequencing of the complete genome is fundamental to understanding aspects relative to pathogenesis, infection, epidemiology, and immunity.

The effect of vaccination in controling bacterial disease caused by Aeromonas hydrophila in nile tilapia (Oreochromis niloticus)

2014 ◽  
pp. 27
Author(s):  
Arne A Ratulangi ◽  
Reiny Tumbol ◽  
Hengky Manoppo ◽  
Henneke Pangkey
Keyword(s):  
Survival Rate ◽  
Aeromonas Hydrophila ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Bacterial Disease ◽  
Immersion Method ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Different Ages ◽  
Motile Aeromonas Septicaemia

This study aims to apply vaccination against bacterial disease. The purpose of vaccination is to trigger the immune respone both non-specific and specific of fish against bacteria Motile Aeromonas Septicaemia (MAS) caused by Aeromonas hydrophila. The vaccination for fish with different ages: 2-3 weeks and 5 weeks were done using immersion method. The fish were re-vaccinated (booster) after two weeks of the first vaccination. The survival rate was < 50 % for juveniles 2-3 weeks and > 50% for juveniles 5 weeks. Survival rate for juveniles 5 weeks was higher than juveniles of 2-3 weeks. This shows that organs of juveniles of 5 weeks were more complete than the 2-3 weeks juveniles. The age of fish is one of the important factors for successfully vaccination. Penelitian ini bertujuan untuk melakukan penerapan vaksinasi terhadap penyakit bakterial. Vaksinasi ditujukan untuk merangsang respon kekebalan non- spesifik dan spesifik pada tubuh ikan terhadap penyakit Motile Aeromonas Septicaemia (MAS) yang disebabkan oleh bakteri Aeromonas hydrophila. Vaksin diberikan pada benih ikan nila yang berbeda umur yaitu 2-3 minggu dan 5 minggu dengan menggunakan metode perendaman. Ikan divaksinasi ulang (booster) setelah 2 (dua) minggu dari vaksinasi yang pertama. Prosentase kelangsungan hidup < 50 % untuk benih umur 2-3 minggu dan > 50% untuk benih umur 5 minggu. Jumlah kematian benih umur 2-3 minggu lebih tinggi dari 5 minggu. Hal ini menunjukkan bahwa fungsi organ benih umur 5 minggu telah lebih lengkap dari pada benih umur 2-3 minggu. Umur ikan merupakan salah satu faktor penting penentu keberhasilan suatu kegiatan vaksinasi.

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