scholarly journals Genotoxicity of sub-lethal di-n-butyl phthalate (DBP) in Nile tilapia (Oreochromis niloticus) / Genotoksičnost subletalne koncentracije di-n-butil ftalata (DBP-a) u nilskoj tilapiji (Oreochromis niloticus)

2016 ◽  
Vol 67 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Aysel Çağlan Karasu Benli ◽  
Belda Erkmen ◽  
Figen Erkoç
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Positive Control ◽  
Control Groups ◽  
Aquatic Life ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Solvent Control ◽  
The Mean ◽  
Butyl Phthalate

Abstract This study aimed to assess genotoxicity in Nile tilapia (Oreochromis niloticus) erythrocytes after exposure to a sub-lethal concentration of 10 mg L-1 di-n-butyl phthalate (DBP) for 24 and 96 h. The results showed that mean MN frequencies in both DBP and ethyl methane-sulfonate (EMS, positive control for MN bioassay) groups were significantly different (p<0.01) with respect to control and solvent control groups, in both exposure scenarios. When analysing nuclear abnormalities, the frequency of notched nuclei was significantly different (p<0.05) but the frequencies of other subtypes did not change. The 96-h exposure led to an increase in the mean frequencies of notched nuclei, and also caused significant differences between MN frequencies in all groups (p<0.01). Our findings indicate that sub-lethal DBP concentrations when tested in controlled laboratory conditions have genotoxic potential towards Nile tilapia. Further detailed studies should be done for the determination of the environmental risk assessment for aquatic life since DBP is a high risk contaminant of freshwater and marine ecosystems.

scholarly journals Determination of presence and quantification of cadmium, lead and copper in Nile tilapia (Oreochromis niloticus) fillets obtained from three cold storage plants in the state of Parana, Brazil

2011 ◽  
Vol 31 (2) ◽  
pp. 361-365 ◽  
Author(s):  
Alexandre Nobuhiro Tajiri ◽  
Daisy Pontes Netto ◽  
Márcia Sassahara ◽  
Mari Sylmara Martins Rodrigues ◽  
Cristina Arduini Cavalcanti de Arruda
Keyword(s):  
Cold Storage ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
The State ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Cadmium Lead

scholarly journals Trichodina magna Van As and Basson, 1989 (Ciliophora: Peritrichia) from cultured Nile tilapia in the state of Santa Catarina, Brazil

2008 ◽  
Vol 68 (1) ◽  
pp. 169-172 ◽  
Author(s):  
ML. Martins ◽  
L. Ghiraldelli
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Original Description ◽  
The State ◽  
The Body ◽  
Fish Ponds ◽  
Santa Catarina ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Mean Diameter ◽  
The Mean

Specimens of Trichodina magna Van As and Bassson, 1989 (Ciliophora: Peritrichia) from the Nile tilapia Oreochromis niloticus collected from October 2004 to June 2005 in fish ponds situated in three regions of Santa Catarina State, Brazil are described here. Wet smears of skin and gills were prepared in the field, air dried, impregnated with Klein’s dry silver method and Giemsa’s solution. From a total of 146 examined fish, 36 were parasitized on the skin, 14 in the gills and 33 on the skin and gills, simultaneously. The mean diameter of the body of the specimens of T. magna was 84.3 ± 12.6 µm, adhesive disc 60.7 ± 10.0 µm, denticulate ring, 38.3 ± 7.4 µm, consisting of 26 (23 to 29) denticles. The only distinguishable difference from the original description was the fact that the ray of the denticle is anteriorly directed and does not extend over the y + 1 axis.

Characterisation of thermostable trypsin and determination of trypsin isozymes from intestine of Nile tilapia (Oreochromis niloticus L.)

2012 ◽  
Vol 134 (3) ◽  
pp. 1533-1541 ◽  
Author(s):  
Sasimanas Unajak ◽  
Piyachat Meesawat ◽  
Atchara Paemanee ◽  
Nontawith Areechon ◽  
Arunee Engkagul ◽  
...  
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Trypsin Isozymes

scholarly journals A Comparative Study on the Growth, Feed Conversion and Production of Fry of Improved and Non-improved Strains of the Nile Tilapia Oreochromis niloticus

2007 ◽  
Vol 19 (4) ◽  
Author(s):  
M.T. RIDHA
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Survival Rates ◽  
Feed Conversion ◽  
Daily Growth ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Fish Weight ◽  
The Gift ◽  
Genetically Improved ◽  
The Mean

Two experiments were conducted consecutively to evaluate and compare the mean weight (MWT), daily growth rate (DGR), feed conversion ratio (FCR), survival and production rate (PR) in the non-improved strain (NS) of the Nile tilapia, Oreochromis niloticus (Cichlidae) with those in the Genetically Improved Farmed Tilapia (GIFT) strain and the FaST selected tilapia (FaST), from the swim-up fry stage to fish weight of 1.0 g (Experiment 1) and from fish weight of 1.0 to 20 g (Experiment 2). In both experiments, results showed the GIFT and FaST strains to have significantly higher MWT, faster DGR, lower FCR and higher PR than those of the NS. Unlike in Experiment 1, survival rates did not differ significantly among the three strains. In Experiment 1, the improvements in the FaST for the MWT, DGR and PR over those for the NS were 77.9, 72.9 and 33.6%, respectively. In Experiment 2, the improvements for the same parameters were 58.7, 57.8 and 54.5%, respectively. These results indicate the advantage and potential of culturing the FaST or the GIFT strain in Kuwait for improving the production of fresh tilapia, reducing the production cost and increasing the profitability of tilapia farms.

scholarly journals Stimulation of non-specific immunity, gene expression, and disease resistance in Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758), by the methanolic extract of the marine macroalga, Caulerpa scalpelliformis

2019 ◽  
Vol 12 (2) ◽  
pp. 271-276 ◽  
Author(s):  
Omita Yengkhom ◽  
Konda Subramanian Shalini ◽  
P. A. Subramani ◽  
R. Dinakaran Michael
Keyword(s):  
Gene Expression ◽  
Body Weight ◽  
Disease Resistance ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Lethal Dose ◽  
Positive Control ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Serum Lysozyme ◽  
Marine Macroalga

Aim: The objective of the present study was to test the immunostimulating potential of marine macroalga, Caulerpa scalpelliformis, in terms of non-specific immune responses, gene expression, and disease resistance of Nile tilapia, Oreochromis niloticus (Linnaeus, 1758). Materials and Methods: O. niloticus was injected intraperitoneally with three different doses of methanol extract of C. scalpelliformis (CSME) (2 mg/kg, 20 mg/kg, or 200 mg/kg body weight), or MacroGardTM (commercial immunostimulant, positive control, and 20 mg/kg body weight), or distilled water (untreated control). In one set of fish, 5 days post-injection, serum lysozyme, myeloperoxidase, and antiprotease activities were assayed. 24 h after injection, gene expression was analyzed in a separate set of fish. To another set of fish, 1 week post-administration of the products, fish were challenged with lethal dose 50 (LD50) dose of a live virulent pathogen, Aeromonas hydrophila and subsequent resistance to it was noted in terms of cumulative percent mortality. Results: CSME increased serum lysozyme, myeloperoxidase, and antiprotease activities. There was an increase in the expression of lysozyme gene in the spleen of treated fish. Mid dose of CSME caused the minimum mortality of 10% (consequent relative percentage survival = 73) which is comparable to that of the positive control. Conclusion: CSME is considered to have the potential to be developed into an immunostimulant for finfish aquaculture.

scholarly journals Population biology of Nile tilapia, Oreochromis niloticus in Lake Naivasha, Kenya

2020 ◽  
Author(s):  
Edna Waithaka ◽  
Edwine Yongo ◽  
Nicholas Otieno Outa
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Population Biology ◽  
Fishery Management ◽  
Total Mortality ◽  
Sustainable Yield ◽  
Lake Naivasha ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Fish Samples ◽  
The Mean

The Nile tilapia, Oreochromis niloticus was introduced in Lake Naivasha to provide exploitable fisheries. It is one of the commercially important fish providing livelihoods to communities around the lake. However, its stocks in the lake have been declining due to intense fishing, ecological changes and effects of other exotic species. This study investigated on its population and biological parameters. Fish samples (1021) were caught monthly from January to December 2017 using gillnets of mesh-sizes 2-5 inches. A total of 1021 O. niloticus caught had overall sex ratio of 2.21:1.0 (male: female). Length of fish ranged from 9.0 to 40.0 cm TL and weighed between 20 and 1220 g. Length at first maturity (Lm50) was estimated at 28.0 cm TL for all sexes. The mean length and weight for all fish was 22.6 cm and 272.6 g. The slope b of length-weight relationship was 2.86 for all fish. The mean condition factor was 0.99, 1.04 and 1.01 for male, female and all fish, respectively. The asymptotic length (L∞) was 42 cm, growth coefficient (K) 0.21 year−1 and growth performance index (Ф) 2.57. The natural (M), fishing (F) and total mortality (Z) coefficients were estimated at 0.55, 0.26 and 0.80 year−1, respectively. Length at first capture (Lc50) was calculated at 19.38 cm. The optimum sustainable yield (E0.5), maximum sustainable yield (Emax) and maximum economic yield (E0.1) indices were 0.23, 0.35 and 0.26, respectively. This study has provided some insights into biology of O. niloticus and stock assessment relevant information to the fishery management.

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