scholarly journals Influence of Nile tilapia (Oreochromis niloticus) fish farming in net cages on the nutrient and particulate matter sedimentation rates in Umari reservoir, Brazilian semi-arid

2020 ◽  
Vol 17 ◽  
pp. 100358 ◽  
Author(s):  
Júlio César da Silva Cacho ◽  
Rodrigo Sávio Teixeira de Moura ◽  
Gustavo Gonzaga Henry-Silva
Keyword(s):  
Particulate Matter ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Fish Farming ◽  
Sedimentation Rates ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Net Cages ◽  
Semi Arid

scholarly journals KADAR SENYAWA TOKSIK DALAM DARAH IKAN NILA (Oreochromis niloticus) SAAT MUSIM UP-WELLING DI DANAU MANINJAU, SUMATRA BARAT

2020 ◽  
Vol 38 (1) ◽  
pp. 25
Author(s):  
Silvi Susanti
Keyword(s):  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Common Species ◽  
Toxic Chemical ◽  
Chemical Substances ◽  
Nile Tilapia Oreochromis Niloticus ◽  
West Sumatra ◽  
Phosphate Nitrate ◽  
Net Cages ◽  
Toxic Chemical Substances

Maninjau lake is the largest center for the freshwater floating-net-cage fisheries system in West Sumatra. Every year, during the up-welling season, a huge number of fish suffered to death in the lake including nile tilapia (Oreochromis niloticus), a common species cultivated in the floating-net cages. This current study aimed to determine the factors contributing to the death of fish by measuring the concentration of toxic chemical substances in the blood plasm of nile tilapia as well as in the subtrate collected from the bottom of the lake. The samples were collected in the sites with higher number of floating-net cages as well as higher number of mass death of fish (Tanjung Sani, Pakan Raba’a dan Maninjau) during the up-welling season. The result revealed that the levels of phosphate, nitrate, nitrit, and amonium were higher in the blood plasm of the fish. Moreover, the levels of those chemical substances were also higher in the substrate of the lake. The higher concentration of the toxic chemical substances might contribute to the mass death of fish living in the floating-net cages during the up-welling season.

scholarly journals BROODSTOCK SEX RATIO IMPROVES FRY PRODUCTION IN NILE TILAPIA(OREOCHROMIS NILOTICUS) IN NORTHERN SENEGAL

2021 ◽  
Vol 9 (02) ◽  
pp. 72-76
Author(s):  
Mouhamadou Amadou Ly ◽  
◽  
Abdoulaye Ngom ◽  
Ahmadou Bamba Fall ◽  
Ousmane Diouf ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Sex Ratios ◽  
Survival Rates ◽  
Fish Farming ◽  
Commercial Diet ◽  
Ph Values ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Female Survival

This present study was conducted to determine fry production in different male-female sex ratios of Oreochromis niloticusbroodstock in order to improve fry production, which handicapped the development of fish farming in northern Senegal. A total of 180 broodfish (47 males and 133 females) were stocked at a density of 2 fish /m2and was replicated three times for each sex ratio of 1:2, 1:3and 1:4 (male : female). Mean body weight ranges from 136.47±2.13 and 107.27±2.14 g for female and male O. niloticusbroodstock, respectively. The experiment was conducted for 90 days and the broods were fed on commercial diet containing 32% crude protein.Fish were held in 9 rectangular tanks of 30 m3 each (10 × 3 × 1) and half-filled. The results showed that number of fry produced at different sex ratios were significantly different, with sex ratio of 1:2 producing a highest number of fry (279.67) per female, followed by the 1:3and 1:4 treatment recorded the lowest.Broodstock sex ratios also did not affect female survival rates and all treatments had 100% survival rates. Temperature, dissolved oxygen and pH values obtained were suitable for good water quality and normal tilapia reproduction.In conclusion, the results of the present study recommend to stock Oreochromis niloticus brooders when stocked at a density of 2 fish /m2 at a sex ratio of 1 male : 2 female in order to obtain the highest fry production.

scholarly journals Extensive Net Cage Culture of Nile Tilapia (Oreochromis niloticus) Fingerlings in Nutrient-enriched Pond

Our Nature ◽  
2013 ◽  
Vol 10 (1) ◽  
pp. 61-70
Author(s):  
W. Jiwyam
Keyword(s):  
Body Weight ◽  
Surface Area ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Supplemental Feeding ◽  
Cage Culture ◽  
Initial Body Weight ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Net Cage ◽  
Net Cages

To investigate the potential of extensive net cage culture for Nile tilapia (Oreochromis niloticus) fingerlings, an experiment was conducted in net cages suspended in a fertilized pond. Mixed-sex population of Nile tilapia with an average initial body weight of 0.065 g was used to stock in experimental cages. Four treatments; non added-substrate without supplemental feeding (NSNF), non added-substrate with supplemental feeding (NSAF), added-substrate without supplemental feeding (ASNF), and added-substrate with supplemental feeding (ASAF) were tested. The results indicated that addition of substrates which gave an additional submerged surface area of approximately equal to the total cage surface area did not show significant effect on the growth (p > 0.05). The fish gross yield obtained from non added-substrate cages without supplemental feeding was 1.22 kg/m3 for a 56-day period.DOI: http://dx.doi.org/10.3126/on.v10i1.7752

scholarly journals Mathematical modeling applied to the growth of tilapia in net cages in the sub middle of the São Francisco river

2014 ◽  
Vol 34 (5) ◽  
pp. 1001-1011 ◽  
Author(s):  
José de A. de Sousa Júnior ◽  
Marlon da S. Garrido ◽  
Paulo G. S. de Carvalho ◽  
Luciano G. da Rocha ◽  
Daniela F. B. Campeche
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Models ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Nonlinear Models ◽  
Logistic Models ◽  
Point Of View ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Net Cages ◽  
Weight For Age

This study aimed to apply mathematical models to the growth of Nile tilapia (Oreochromis niloticus) reared in net cages in the lower São Francisco basin and choose the model(s) that best represents the conditions of rearing for the region. Nonlinear models of Brody, Bertalanffy, Logistic, Gompertz, and Richards were tested. The models were adjusted to the series of weight for age according to the methods of Gauss, Newton, Gradiente and Marquardt. It was used the procedure "NLIN" of the System SAS® (2003) to obtain estimates of the parameters from the available data. The best adjustment of the data were performed by the Bertalanffy, Gompertz and Logistic models which are equivalent to explain the growth of the animals up to 270 days of rearing. From the commercial point of view, it is recommended that commercialization of tilapia from at least 600 g, which is estimated in the Bertalanffy, Gompertz and Logistic models for creating over 183, 181 and 184 days, and up to 1 Kg of mass , it is suggested the suspension of the rearing up to 244, 244 and 243 days, respectively.

scholarly journals Extreme drought events and the sustainability of fish farming in net cages in reservoirs of the semi-arid northeastern region in Brazil

2019 ◽  
Vol 31 ◽  
Author(s):  
Gustavo Gonzaga Henry-Silva ◽  
Hênio do Nascimento Melo-Junior ◽  
José Luiz Attayde
Keyword(s):  
Socioeconomic Development ◽  
Fish Farming ◽  
Extreme Drought ◽  
Ecological Functions ◽  
Production Sector ◽  
Brazilian Semiarid ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Food Fish ◽  
Net Cages ◽  
Semi Arid

Abstract Reservoirs play important roles in local socioeconomic development and are particularly relevant in developing countries. The rearing of Nile tilapia (Oreochromis niloticus) in cages is one of the fastest growing activities carried out in reservoirs since it is a strategy to sustain the growing demand for food fish. Most reservoirs are in eutrophic or hypereutrophic conditions in the semi-arid northeast region of Brazil and thus, the expansion of aquaculture endangers the ecological functions of the reservoirs by increasing the eutrophication potential. On the other hand, aquaculture contributes to economic development by generating jobs and income for the population and being an important alternative in the production sector for riverine populations. In this context, we present in this article our opinion about the sustainability of fish farming activities in net cages in reservoirs of the Brazilian semiarid, especially when subjected to extreme drought events.

scholarly journals Life Cycle Assessment of Nile Tilapia (Oreochromis niloticus) Farming in Kenyir Lake, Terengganu

2020 ◽  
Vol 12 (6) ◽  
pp. 2268
Author(s):  
Hayana Dullah ◽  
M. A. Malek ◽  
Marlia M. Hanafiah
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Oreochromis Niloticus ◽  
Nile Tilapia ◽  
Fish Farming ◽  
Fish Feed ◽  
Intergovernmental Panel ◽  
Feed Formulation ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Materials Used

This study presents results from a life cycle assessment (LCA) conducted following the CML-IA method on caged aquaculture of Nile tilapia (Oreochromis niloticus) species at Como River, Kenyir Lake, Terengganu, Malaysia. In this study, the greenhouse gas (GHG) estimation, calculated based on the Intergovernmental Panel on Climate Change (IPCC) 2006 Guidelines, showed that 245.27 C eq (1.69 Kg) of nitrate oxide (N2O) was emitted from the lake. The determination of LCA was conducted using several inputs, namely N2O, compositions of fish feed, materials used to build fish cages (infrastructure), main materials used during operation and several databases, namely Agri-footprint, Ecoinvent 3, European Reference Life-Cycle Database (ELCD), and Industry Data 2.0. The results show that feed formulation is the major contributor to potential environmental impact in aquaculture farming, at 55%, followed by infrastructure at 33% and operation at 12%. The feed formulation consisting of 53% broken rice contributed to marine ecotoxicity (MET), while those consisting of 44% fish meal and 33% soybean meal contributed to abiotic depletion (ABD) and global warming (GW), respectively. It is recommended that the percentage of ingredients used in feed formulation in fish farming are further studied to reduce its impacts to the environment.

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