Phenological and Liver Antioxidant Profi les of Adult Nile Tilapia (Oreochromis niloticus) Exposed to Toxic Live Cyanobacterium (Microcystis aeruginosa Kützing) Cells

2012 ◽  
Vol 67 ◽  
pp. 0620
Author(s):  
Hanan M. Khairy ◽  
Marwa A. Ibrahim ◽  
Mai D. Ibrahem
Keyword(s):  
Microcystis Aeruginosa ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Nile Tilapia Oreochromis Niloticus

scholarly journals Phenological and Liver Antioxidant Profiles of Adult Nile Tilapia (Oreochromis niloticus) Exposed to Toxic Live Cyanobacterium (Microcystis aeruginosa Kceützing) Cells

2012 ◽  
Vol 67 (11-12) ◽  
pp. 620-628 ◽  
Author(s):  
Hanan M. Khairy ◽  
Marwa A. Ibrahim ◽  
Mai D. Ibrahem
Keyword(s):  
Microcystis Aeruginosa ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Economic Problem ◽  
Cyanobacterial Blooms ◽  
Fish Mortality ◽  
Blue Green Algae ◽  
Progressive Development ◽  
Cyanobacterial Species ◽  
Nile Tilapia Oreochromis Niloticus

Blue-green algae (cyanobacteria) constitute the greater part of the phytoplankton. Microcystis aeruginosa is amongst the most ubiquitously distributed cyanobacterial species, and almost invariably produces cyclic heptapeptide toxins called microcystins (MCs). The present study was designed to investigate the phenological and liver antioxidant profiles of the Nile tilapia Oreochromis niloticus chronically exposed to toxic live M. aeruginosa cells. Fish were grown in the absence and presence of M. aeruginosa in three different concentrations for seven days, and subsequently reared for another 30 days in the absence of the cyanobacteria. While cyanobacteria did not cause any fish mortality, there was a progressive development of yellowish discolouration in the livers of exposed fish. In the livers, the activities and levels of superoxide dismutase (SOD), lactate dehydrogenase (LDH), glutathione (GSH), and lipid peroxidation products like malondialdehyde (MDA) were elevated in response to the concentration of M. aeruginosa. Moreover, DNA fragmentation and DNA-protein crosslinks were measured. These parameters can thus be considered potential biomarkers for the fish exposure to M. aeruginosa. The present study sheds light on cyanobacterial blooms like health, environmental, and economic problem, respectively.

Effects of toxic Microcystis aeruginosa bloom on liver of nile tilapia (Oreochromis niloticus)

2017 ◽  
Vol 45 (1) ◽  
pp. 1-10
Author(s):  
Sumaiya Ahmed ◽  
Bernd Giese ◽  
Volker Schulz ◽  
Md Sagir Ahmed
Keyword(s):  
Microcystis Aeruginosa ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Fish Tissue ◽  
Histopathological Change ◽  
Control Group ◽  
Histopathological Changes ◽  
Internal Organs ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Vascular Proliferation

The effects of toxic Microcystis aeruginosa on the liver of Nile tilapia, Oreochromis niloticus were investigated in the laboratory. Four treatments were setup into aquariums for 15 days to investigate the histopathological changes exposed to Microcystis aeruginosa bloom. Fishes of treatment A1 were treated as a control group and given artificial feed. In the three treatments (A2, A3 and A4), the M. aeruginosa cell concentration were 35 × 102, 72 × 102, 149 × 102 colony/ml, respectively. In the control group, no histopathological change was observed. In exposed fish, histopathological alterations were characterized by swollen and granular cytoplasm, vascular proliferation, bile stasis, fatty change and focal necrosis. Histopathological changes were observed within five days of exposure when fish exposed to moderate (72 × 102 colony/ml) to high (149 × 102 colony/ml) bloom concentration, whereas it took 15 days in lower concentration (35 × 102 colony/ml). Histopathological changes proved that intake of toxic M. aeruginosa bloom by aquatic animals, particularly Nile tilapia has significant effects on its internal organs that may cause of massive mortality. Accordingly, cyanotoxin accumulation in fish tissue my pose a risk to human health through the food chain.Bangladesh J. Zool. 45(1): 1-10, 2017

Characterization of Francisella noatunensis subsp. orientalis isolated from Nile tilapia Oreochromis niloticus farmed in Lake Yojoa, Honduras

2019 ◽  
Vol 133 (2) ◽  
pp. 141-145 ◽  
Author(s):  
E Soto ◽  
K Shahin ◽  
JJ Talhami ◽  
MJ Griffin ◽  
A Adams ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Nile Tilapia Oreochromis Niloticus

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.

Effect of low temperature on genomic DNA methylation in Nile tilapia (Oreochromis niloticus)

2013 ◽  
Vol 37 (10) ◽  
pp. 1460 ◽  
Author(s):  
Huaping ZHU ◽  
Maixin LU ◽  
Zhanghan HUANG ◽  
Fengying GAO ◽  
Xiaoli KE ◽  
...  
Keyword(s):  
Dna Methylation ◽  
Low Temperature ◽  
Oreochromis Niloticus ◽  
Genomic Dna ◽  
Nile Tilapia ◽  
Nile Tilapia Oreochromis Niloticus
Sign in / Sign up

Export Citation Format

Share Document