scholarly journals Invasive Potential of Nile Tilapia, Oreochromis Niloticus (Linnaeus, 1758) From the Tributary of the Ganga River, Central India

2021 ◽  
pp. 1-5
Author(s):  
Amitabh Chandra Dwivedi ◽  
◽  
Priyanka Mayank ◽  
Keyword(s):  
Oreochromis Niloticus ◽  
Uttar Pradesh ◽  
Central India ◽  
Size Composition ◽  
Size Group ◽  
Invasive Potential ◽  
Wild Stock ◽  
Total Length ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Large Water

The natural fishery or wild stock of fishes especially fresh water in India is significantly declining due to manmade stressors. The invasion of fishes and size composition are an essential component of stream, river and other large water bodies ecosystem and represents an evident of structure, function, depth and health of stream/river. During study period 683 specimens of Oreochromis niloticus were collected from February 2019 to January 2020 in Sirsa fish landing centre from the lower stretch of the Tons river at Prayagraj, Uttar Pradesh, India. Size composition of fishes was varied from 82 to 463 mm (total length). The maximum total length of O. niloticus in the catches indicated that its increasing colonisation success in the river Tons. Size composition of fishes was also indicated that the stock of O. niloticus in the Tons river was in healthy condition. The 231-260 mm size group was most dominated (15.67%) compared to 261-290 mm (12.44%) and 291-320 mm (11.71%) in the total exploited stock. The middle size group was maximum exploited with 51.24% from the Tons river at Prayagraj. Higher size group contributed sizeable proportion with 25.04% in the exploited stock. The exploitation pattern was unsystematic in higher size group due to contribution of higher proportion. Current exploitation pattern is unsystematic but O. niloticus is powerfully invaded from the lower stretch of the Tons river at Prayagraj.

scholarly journals Invasive potential of common carp (Cyprinus carpio) and Nile tilapia (Oreochromis niloticus) in American freshwater systems

2006 ◽  
Vol 63 (9) ◽  
pp. 1903-1910 ◽  
Author(s):  
Luis Zambrano ◽  
Enrique Martínez-Meyer ◽  
Naercio Menezes ◽  
A Townsend Peterson
Keyword(s):  
Common Carp ◽  
Cyprinus Carpio ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Ecological Niche Modeling ◽  
High Mountain ◽  
Invasive Potential ◽  
Common Carp Cyprinus Carpio ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Carp Cyprinus Carpio

Nonnative fish introductions disrupt ecosystem processes and can drive native species to local extinction. Two of the most widespread, introduced species are the common carp (Cyprinus carpio) from Eurasia and the Nile tilapia (Oreochromis niloticus) from Africa. In North and South America, these introductions stem from aquaculture facilities, as well as historical introductions for recreational angling. An emergent field of ecological niche modeling provides robust predictions of the geographic potential of alien species to better understand their capacity to become established at broad scales. We used this modeling approach to produce spatially explicit predictions of the invasive potential of common carp and Nile tilapia in the Americas. Model predictions were tested using occurrence data for established populations in their native area and in the Americas. Results indicated that predictive power of niche models was high. Distributional potential of common carp in the Americas covers most temperate regions and high mountain tropical aquatic systems, whereas that of Nile tilapia is focused in the tropics and coast areas. The consequences of the potential establishment of these exotic species can be profound on native aquatic faunas, particularly on highly diverse regions such as the Amazon Basin and central Mexico.

scholarly journals UKURAN PERTAMA KALI MATANG GONAD DAN SELEKTIVITAS JARING INSANG IKAN NILA (Oreochromis niloticus) DI WADUK JATILUHUR, JAWA BARAT

2019 ◽  
Vol 18 (3) ◽  
Author(s):  
Andri Warsa ◽  
Lismining Pujiyani Astuti
Keyword(s):  
Fisheries Management ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Mesh Size ◽  
Fishing Gear ◽  
Fish Size ◽  
Total Length ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Size Interval

A gillnet is a common fishing gear for exploitation and fish capture at Jatiluhur Reservoir. The fish size captured by the gillnet depends on the mesh size for its selective fishing gear. Determination of gillnet mesh size is one of effort for fisheries management.  The management of nile tilapia (Oreochromis niloticus) is based on gillnet selectivity and reproductive biology of nile tilapia. The aim of the research was to estimate length at the first mature (Lm) and gillnet selectivity for nile tilapia. The research was conducted at February-September 2017 through experimental fishing using gillnet with 1.0–4.0 mesh size (interval 0.5 inch). The gillnet installation was performed at six stations, namely Cihuni-Cibadak, Sungai Cikanyayan, Sungai Ciririp, Sungai Cihonje, Pasir Kole and Cilalawi. The Lm of nile tilapia was 18.3 and 23.3 cm for female and male, respectively. The total length retained in the gillnet with the highest probability for mesh size 1.0; 1.5; 2.0; 2.5; 3.0; 3.5 and 4.0 inches were 9.5; 12.5; 14.5; 18.5; 20.5; 26.5 and 30.5 cm, respectively. The minimum mesh size used for nile tilapia exploitation was ≥3 inches because it was able to catch nile tilapia with the total length larger than Lm (Lc>Lm) and with an SPR value of > 40% so that the tilapia resource in the Jatiluhur Reservoir remains sustainable.  

scholarly journals Morphological variability of the 11th generation strain of nile tilapia, (Oreochromis niloticus) and traditional genetically improved farmed tilapia

2012 ◽  
Vol 9 (2) ◽  
pp. 345-349 ◽  
Author(s):  
KM Shahriar Nazrul ◽  
AA Mamun ◽  
BS Sarker ◽  
US Tonny
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Linear Growth ◽  
Morphological Variability ◽  
Meristic Characters ◽  
Mean Values ◽  
Total Length ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Significant Difference ◽  
The Mean

To investigate the morphological variations 12 morphometric and 11meristic characters were studied for 100 individuals of the same age of traditional strain GIFT (5th generation) and recently developed 11th generation strain    (GIFU) of Nile tilapia, Oreochromis niloticus. No significant difference was found between total length and other body measurements at 5% level. However, GIFU showed faster linear growth on body depth, maximum body circumference and minimum body circumference where GIFT showed faster linear growth on standard length and head length. On meristic characters, notable variations were observed in case of scale above and below the lateral line, where GIFU individuals showed greater number of scales in both cases. The total length and body weight relationship of both the strains were found to be straight line in logarithmic scales. The mean values of condition factor (K) have been found to be 1.671 for GIFT and 1.711 for GIFU and the mean values of relative condition facto (Kn) were 1.001 and 1.002 for GIFT and GIFU respectively. Findings of the present study suggested the variability of strain GIFU and GIFT in some important parameters.   DOI: http://dx.doi.org/10.3329/jbau.v9i2.11050   J. Bangladesh Agril. Univ. 9(2): 345–349, 2011

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
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