scholarly journals FEEDING INTERACTION OF THE NON-NATIVE AFRICAN CATFISH (Clarias gariepinus BURCHELL, 1822) IN ITANHÉM RIVER ESTUARY, BAHIA, BRAZIL

2014 ◽  
Vol 62 (3) ◽  
pp. 179-186 ◽  
Author(s):  
Leandro Bonesi Rabelo ◽  
Lucy Satiko Hashimoto Soares
Keyword(s):  
Native Species ◽  
Clarias Gariepinus ◽  
River Estuary ◽  
Northeastern Brazil ◽  
African Catfish ◽  
Important Food ◽  
Centropomus Undecimalis ◽  
Food Overlap ◽  
The Impact ◽  
Main Food Item

A total of 214 stomachs of Clarias gariepinus, Centropomus undecimalis and C. parallelus from the Itanhém and Caravelas Rivers, northeastern Brazil, were analyzed to investigate the impact of the non-native species Clarias gariepinus on the Itanhém River food web as compared to that of the adjacent Caravelas River, where this species has not been registered. In Itanhém River, shrimp was the most important food for C. gariepinus, and Teleostei for C. parallelus. In the Caravelas River, Brachyura was the main food item for C. parallelus, and Teleostei for C. undecimalis. There was no food overlap between the species within or between rivers. There is no evidence, in the results of this study, of changes in the diet of the Centropomus parallelus due to the presence of the non-native species.

Impact of Ogun River pollution on antioxidants and proximate composition of African catfish (Clarias gariepinus)

2019 ◽  
Vol 46 (3) ◽  
pp. 163-184
Author(s):  
B. O. Onunkwor ◽  
T. O. Akinpelu ◽  
O. J. Oladipupo ◽  
R. N. Ugbaja ◽  
O. J. Olaoye ◽  
...  
Keyword(s):  
Proximate Composition ◽  
Clarias Gariepinus ◽  
Chemical Properties ◽  
Oxygen Demand ◽  
Control Fish ◽  
Average Weight ◽  
African Catfish ◽  
Fish Samples ◽  
The Impact ◽  
Ogun River

Most rivers in Nigeria are polluted without conscious efforts to abate ensuant consequences. Thus, Clarias gariepinus, an aquatic commercial food from Ogun River, Nigeria, was studied to investigate the impact of pollution on antioxidants and proximate composition. During the rainy season, 50 C. gariepinus (average weight 426.53 ± 24.40g and length 37.73 ± 0.95cm) were site sampled, 10 from each of Ago-Odo, Ago-Ika, Oke-Sokori, and Quarry along Ogun River course. Ajegunle-Adao cultured pond, served as control. The parameters assayed for included: some heavy metals and physico-chemical properties of sampled water, antioxidants and proximate composition of the fish samples. Physicochemical parameters of river studied showed that temperature of all sites ranged from 26 to 29°C, pH: 6.9 to 7.8, dissolved oxygen: 9.5 to 21.6, biochemical oxygen demand: 3.60 to 14.10, and chemical oxygen demand: 60 to 650. Lead (Pb) concentration ranged from 4.0 to 17.0 μg/L and cadmium (Cd): 0.0 to 6.0 μg/L. Blood Pb, Cd, activities of: superoxide dismutase, catalase, glutathione-S-transferase, plasma xanthine oxidase, and lipid peroxidation level of fish samples from Ago-Ika were most significantly (p < 0.05) high, with significant (p < 0.05) lowest reduced glutathione concentration amongst the samples from polluted sites when compared to control fish. Proximate analysis showed that the fish samples from Ogun River had significantly (p < 0.05) lower protein, fat contents, and higher nitrogen-free extract while Ago-Ika, Oke-Sokori and Quarry sites had significantly (p < 0.05) lower moisture, ash and fibre contents when compared with control. It can be concluded that the impact of pollution induced oxidative stress and significantly diminished the nutritional value of C. gariepinus from Ogun River.

The impact of elevated water ammonia concentration on physiology, growth and feed intake of African catfish (Clarias gariepinus)

Aquaculture ◽  
2010 ◽  
Vol 306 (1-4) ◽  
pp. 108-115 ◽  
Author(s):  
Edward Schram ◽  
Jonathan A.C. Roques ◽  
Wout Abbink ◽  
Tom Spanings ◽  
Pepijn de Vries ◽  
...  
Keyword(s):  
Feed Intake ◽  
Clarias Gariepinus ◽  
Ammonia Concentration ◽  
African Catfish ◽  
Elevated Water ◽  
The Impact

The impact of changing dietary Na/K ratios on growth and nutrient utilisation in juvenile African catfish, Clarias gariepinus

Aquaculture ◽  
2001 ◽  
Vol 198 (3-4) ◽  
pp. 293-305 ◽  
Author(s):  
Yueming Dersjant-Li ◽  
Sheng Wu ◽  
Martin W.A Verstegen ◽  
Johan W Schrama ◽  
Johan A.J Verreth
Keyword(s):  
Clarias Gariepinus ◽  
African Catfish ◽  
Nutrient Utilisation ◽  
The Impact

scholarly journals Histopathological Biomarkers as Indicators of the Environmental Quality of Two Estuaries in Northeastern Brazil

2021 ◽  
Author(s):  
ITALA Gabriela Sobral SANTOS ◽  
Alex Souza Lira ◽  
Carolina da Silva Montes ◽  
Flávia Lucena Frédou ◽  
Rossineide Martins Rocha
Keyword(s):  
River Estuary ◽  
Trophic Levels ◽  
Northeastern Brazil ◽  
Santa Cruz ◽  
Vacuolar Degeneration ◽  
Centropomus Undecimalis ◽  
Environment Quality ◽  
Hg Pollution ◽  
Sugarcane Industry

Abstract The present study aimed at evaluating the environment quality of the Santa Cruz Channel estuary (area 1) and Sirinhaém river estuary (area 2), Northeastern Brazil, using histopathological biomarkers of liver and gills of fish species with different trophic levels as indicators. It was collected liver and gills from five species: Bairdiella ronchus (n=24) and Gobionellus stomatus (n=34) in the area 1; Caranx latus (n=35), Centropomus undecimalis (n=24) and Centropomus parallelus (n=29) from area 2. The liver showed several damages, such as, hepatic steatosis, necrosis, vacuolar degeneration, and infiltration. Centropomus undecimalis had the highest Histopathological Index of Liver (HIL). Gills exhibited moderate to severe alterations for all species, such as the lifting of epithelial cells, lamellar aneurysm, and rupture of the lamellar epithelium. Centropomus undecimalis in area 2 and G. stomatus in area 1 had the higher number of alterations in their organs. Both areas have been historically affected by mercury (Hg) pollution in área 1 and by the sugarcane industry in area 2 and the species used as biomarkers has been proven to be severely damaged in both estuaries. Species chosen in this study were considered good bioindicators of pollution and the combination of biomarkers methodologies in two organs, pioneering in the Northeastern of Brazil, was efficient in diagnosing the health status of the area using fish as bioindicator.

scholarly journals Rising Temperature Effects on Growth and Gastric Emptying Time of Freshwater African Catfish (Clarias Gariepinus) Fingerlings

Animals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3497
Author(s):  
Sonia Mohd Kasihmuddin ◽  
Mazlan Abd. Ghaffar ◽  
Simon Kumar Das
Keyword(s):  
Gastric Emptying ◽  
Water Temperature ◽  
Growth Performance ◽  
Clarias Gariepinus ◽  
African Catfish ◽  
Food Conversion ◽  
Gastric Emptying Time ◽  
The Impact ◽  
Limited Scope ◽  
Emptying Time

The present study was carried out to analyse the effect of water temperature on two components: (1) growth performance, and (2) gastric emptying time (GET) of African catfish Clarias gariepinus fingerlings. After 70 days, it was observed that experimental temperatures had no significant effects on the growth performance parameters, except for food conversion ratio (FCR) and food conversion efficiency (FCE). GET observation through X-radiography denoted that the shortest GET (10 h) was observed in fish reared at 32 °C and the longest GET (16 h) was observed in fish reared at 26 °C. The rapid digestion rate coincides with the FCR and FCE obtained in this study. Considering the limited scope of our study, more extensive studies on the impact of water temperature on other fish physiological parameters should be pursued. A better understanding of this research topic would be beneficial for the growth of African catfish fingerling aquaculture.

scholarly journals Economic Analysis and Improvement Opportunities of African Catfish (Clarias gariepinus) Aquaculture in Northern Germany

2021 ◽  
Vol 13 (24) ◽  
pp. 13569
Author(s):  
Johannes Pasch ◽  
Harry W. Palm
Keyword(s):  
Economies Of Scale ◽  
Clarias Gariepinus ◽  
Product Diversification ◽  
African Catfish ◽  
Selling Price ◽  
Production Volume ◽  
Market Conditions ◽  
Price Variation ◽  
Aquaculture System ◽  
The Impact

A farmland based African Catfish recirculation aquaculture system with a production volume (PV) of 300 m3 was modelled under realistic market conditions in order to analyse the impact of price fluctuations on profitability. As a monoculture recirculating aquaculture system (RAS) for whole fish and the wholesaler’s market, the model northern German catfish aquaculture is currently gainless, but the production is sufficient to cover all costs. The most decisive economic parameter is the low selling price (2.20 EUR/kg whole fish), which affects the returns by ±70,463 EUR/year for every ten percent (0.22 EUR) price change. Among the variable costs, feed has by far the largest impact with a share of 61.4% (42.1% of total costs). Based on the initial model every ten percent price variation of this variable input factor changes the returns by ±29,691 EUR/year, followed by energy (±5913 EUR/year), fingerlings (±4804 EUR/year), wages (±3972 EUR/year) and water (±2464 EUR/year). Larger system sizes (600 m3 PV) significantly save costs due to economies of scale and achieve returns of 175,240 EUR/year and an ROI of 11.45%. Increasing max. stocking density from 450 kg/m3 to 550 kg/m3 improves returns and ROI (40,379 EUR/year; 4.40%), but also involves higher production risks. An own fingerling production with a production of 300% above the own requirements improves returns and ROI (39,871 EUR/year; 3.57%) and leads, above all, to independence from foreign suppliers. Aquaponic integrations can generate profits, but are associated with high investment costs and the challenges of entering a new business sector. Product diversification into fillet (50% of the production) and smoked fillet (30%) generates lucrative returns and ROI (212,198 EUR/year; 20.10%). Profitability is further increased by direct marketing in the form of a farm store and the establishment of a regional “producer organisation”. Our results demonstrate that under current market conditions northern German catfish aquaculture covers all costs, mainly increasing profitability through altered sales prices and feed costs. Retaining a larger part of the fishery value chain within the farm through additional benefits, further processing and product diversification improves profitability, making African catfish RAS a sustainable and economically profitable aquaculture business in Germany.

scholarly journals Utilization of Water Hyacinth (Eichhornia crassipes) as Fish Feed Ingredient

2021 ◽  
pp. 35-42
Author(s):  
Dian Yuni Pratiwi ◽  
Aulia Andhikawati
Keyword(s):  
Water Hyacinth ◽  
Eichhornia Crassipes ◽  
Clarias Gariepinus ◽  
Production Costs ◽  
Raw Material ◽  
Ctenopharyngodon Idella ◽  
African Catfish ◽  
Fish Feed ◽  
Feed Ingredient ◽  
The Impact

A freshwater plant, water hyacinth (Eichhornia crassipes) is commonly found in public waters in Indonesia. Water hyacinth often experiences blooming which causes negative impacts such as lowering oxygen levels, reducing the number of fish, increasing evapotranspiration, disrupting transportation, becoming habitat for disease vectors, and others. However, water hyacinth can be used as an alternative raw material because it still contains nutrients such as carbohydrates, proteins, fats, vitamins, and minerals. Water hyacinth also has potential as an antibacterial agent because it contains secondary metabolites (alkaloids, saponins, steroid compounds, flavonoids, phenolic compounds, glycosides, and cardiac glycosides). The utilization of water hyacinth as fish feed ingredient has been shown to give positive effect on the growth of African catfish (Clarias gariepinus), grass carp (Ctenopharyngodon idella), goldfish (Cyprinus carpio), and Tilapia (Oreochromis niloticus) seeds. The use of water hyacinth as an alternative fish feed ingredient can be a solution to reduce production costs and reduce the impact of water hyacinth blooms.

scholarly journals Measurement of Sub-Lethal Toxicity and Effect of Kerosene Pollutant on Hematological Profile of African Catfish (Clarias gariepinus)

2021 ◽  
pp. 1-17
Author(s):  
E. A. Ivon ◽  
F. O. Sanusi-Jadesola ◽  
N. E. Edu ◽  
C. O. Anyanwu ◽  
G. M. Ubi ◽  
...  
Keyword(s):  
Blood Cell ◽  
Crude Oil ◽  
Cell Count ◽  
Clarias Gariepinus ◽  
Total Mortality ◽  
African Catfish ◽  
Blood Cell Count ◽  
Fish Food ◽  
Aquatic Life ◽  
The Impact

Background and Objectives: The study measured the impact of crude oil fractions and its derivatives like kerosene on the early life and sub-adults growth of African catfish, Clarias gariepinus in terms of mild, acute and chronic toxicity effect. It also examines the effect of indiscriminate spillage of crude oil derivatives on aquatic organisms.  Materials and Methods: Blood profiles such as Red Blood Cell count (RBC), White Blood Cell count (WBC), Blood Differentials, Hemoglobin, (HB), and Packed Cell Volume (PCV) of the treated fishes and control were estimated after exposure of the fish to the kerosene pollutant. Behavioral changes in fish exposed to8.0ml/l, 16.0ml/l, 25.0ml/l and 50.0ml/l of kerosene pollutant varied from erratic swimming, moribund movement, jumping and lack of balance. Results: At concentration 8.0ml/L, mean total mortality was observed within 72hours of exposure. The lethal concentration (LC50) was 8.0ml/L and highest mean mortality observed with 80% kerosene pollutant. PCV of the exposed fish was 26% when compared to the control 27%, HB was 8.9 gdl as against 9.0 gdl in the control. Total WBC was 640 x 109/L as against 1280 x 109/L in control. RBC reading was 2.1 compared to 5.3 mm3 of the control.  Lymphocyte was 80%, Neutrophil was 4% and monocyte 16% compared to 62%, 8% and 30% in control respectively. There was decrease in white blood cells counts for 8.0, 16.0, 25.0 and 50.0ml/L groups (p<0.05) compared to the control. Conclusion: The study concludes that it is necessary to ensure the safety of aquatic life forms especially fishes, by minimizing aquatic pollution with kerosene to sustain fish food quality, availability and security.

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