The effects of artificial substrates on freshwater pond productivity and water quality and the implications for periphyton-based aquaculture

2002 ◽  
Vol 15 (4) ◽  
pp. 231-241 ◽  
Author(s):  
M Azim
Keyword(s):  
Water Quality ◽  
Artificial Substrates ◽  
Freshwater Pond

scholarly journals Aquatic Insects Diversity and Water Quality Assessment of a Tropical Freshwater Pond in Benin City, Nigeria

2020 ◽  
Vol 24 (7) ◽  
pp. 1129-1136
Author(s):  
B.O. Komolafe ◽  
T.O.T. Imoobe
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Aquatic Insects ◽  
Water Bodies ◽  
Total Alkalinity ◽  
Ex Situ ◽  
Insect Community ◽  
Insect Fauna ◽  
Benin City ◽  
Freshwater Pond

Aquatic insects are species of significant importance to water bodies because they serve various purposes including nutrient cycling, vectors of  pathogens and bioindicators of water quality. Analyzing their community structure is a veritable tool in studies of biodiversity and quality of limnetic  ecosystems. Therefore, we investigaTed the health status of a pond in Benin City, Nigeria using insect’s abundance, composition, distribution and physicochemical parameters of the waterbody. Insects were sampled using sweep nets and identified to the species level while water samples were collected and analyzed using in-situ and ex-situ methods to determine the physicochemical properties in three sampling stations. The results of the physicochemical assessment of the water indicated that conditions did not differ widely between sites (P > 0.05) except for total alkalinity, and the recorded values were well within the ambient FMEnv permissible limits for surface water except for dissolved oxygen,turbidity and phosphate. A total of 10 insect taxa, comprising of 103 individuals in 2 orders were recorded in the study and among the orders, Hemiptera comprised of 7 species and Coleoptera comprised of 3 species. Majority of the insect fauna found in this study are typically found in similar water bodies in the tropics. However, the obsereved insect community structure revealed a relatively low taxa richness with a dominance of pollution-resistant species which suggests a moderately polluted condition of the waterbody. Keywords: Aquatic insects, bioindicators, biodiversity, water quality, pond.

Use of artificial substrates in the culture of Litopenaeus vannamei (Biofloc System) at different stocking densities: Effects on microbial activity, water quality and production rates

2013 ◽  
Vol 54 ◽  
pp. 93-103 ◽  
Author(s):  
Rodrigo Schveitzer ◽  
Rafael Arantes ◽  
Manecas Francisco Baloi ◽  
Patrícia Fóes S. Costódio ◽  
Luis Vinatea Arana ◽  
...  
Keyword(s):  
Water Quality ◽  
Microbial Activity ◽  
Litopenaeus Vannamei ◽  
Artificial Substrates ◽  
Production Rates

scholarly journals Determination of Optimum Harvesting Time for Periphyton Production on Artificial Substrates

2013 ◽  
Vol 23 (1-2) ◽  
pp. 51-62
Author(s):  
T Zaman ◽  
MMM Alam
Keyword(s):  
Water Quality ◽  
Mass Production ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Artificial Substrates ◽  
Secchi Disc ◽  
Harvesting Time ◽  
Physico Chemical ◽  
Chemical Water

The experiment was conducted in two cement made cisterns for a four-week period. Important physico-chemical water quality parameters and harvesting time in periphyton production were studied. During the study period, four groups of phytoplankton and two groups of zooplankton were observed. Among phytoplankton, Chlorophyceae was the most dominant having 62% Chlorella followed by Bacillariophyceae having 15% Navicula and 12% Cyclotella, Cyanophyceae having 5% Oscillatoria and 2% Anabaena and Euglenophyceae having 2% Euglena and 1% Phacus. The grand averages of periphyton mass production were 0.569 (± 0.242) mg DM/cm2 in C-1. There was highly significant (p<0.05) variation (F = 14.692) between C-1 and C-2 in respect of periphyton production. Cistern-1 was identified as more productive due to its favourable water quality parameters, i.e., water temperature of 24.6 to 28.3 ºC, Secchi disc reading of 18 to 33 cm, dissolved oxygen of 4.67 to 9.55 mg/L, pH of 9.12 to 10.18, NO3-N of 3.58 to 10.90 mg/L, NH3-N of 0.26 to 0.40 mg/L, PO4-P of 7.5 to 3.4 mg/L, conductivity 0.412 to 0.719 Ms. Third addition of substrate, that means 18- 19th day was identified as the optimum harvesting time of periphyton production.DOI: http://dx.doi.org/10.3329/pa.v23i1-2.16565Progress. Agric. 23(1 & 2): 51 – 62, 2012

Development of river biofilms on artificial substrates and their potential for biomonitoring water quality

Chemosphere ◽  
2009 ◽  
Vol 76 (9) ◽  
pp. 1288-1295 ◽  
Author(s):  
Chien-Jung Tien ◽  
Wen-Hua Wu ◽  
Tzu-Liang Chuang ◽  
Colin S. Chen
Keyword(s):  
Water Quality ◽  
Artificial Substrates

Biofloc formation improves water quality and fish yield in a freshwater pond aquaculture system

Aquaculture ◽  
2019 ◽  
Vol 506 ◽  
pp. 256-269 ◽  
Author(s):  
Haokun Liu ◽  
Handong Li ◽  
Hui Wei ◽  
Xiaoming Zhu ◽  
Dong Han ◽  
...  
Keyword(s):  
Water Quality ◽  
Fish Yield ◽  
Pond Aquaculture ◽  
Aquaculture System ◽  
Freshwater Pond

scholarly journals EVALUATION OF FEEDING RATES IN THE PRODUCTION OF LITOPENAEUS VANNAMEI SHRIMP USING ARTIFICIAL SUBSTRATES

2018 ◽  
Vol 19 (0) ◽  
Author(s):  
César Rocha Nunes Antunes ◽  
Carlos Alberto da Silva Ledo ◽  
Clóvis Matheus Pereira ◽  
José dos Santos
Keyword(s):  
Water Quality ◽  
Growth Performance ◽  
Litopenaeus Vannamei ◽  
Conversion Rate ◽  
Feeding Rate ◽  
Artificial Substrates ◽  
Average Weight ◽  
Feeding Rates ◽  
Feed Conversion ◽  
Feed Conversion Rate

Abstract The objective of this study was to evaluate the the influence of feeding rate and different artificial substrates on both the water quality and growth performance of Litopenaeus vannamei shrimp. The experimental design was randomized blocks with five treatments and four replicates, with a density of 30 shrimp m-2 and mean weight of 2.8 g. The experiment lasted 49 days, and during this period, artificial substrates did not influence the water quality. The increase in the feeding rate influenced the dissolved oxygen of treatments. The final average weight, average final length, final biomass, productivity, and feed conversion rate showed significant differences (p > 0.05). The best food conversion factor was provided by the treatment with a feeding rate of 2%. The treatment with a feeding rate of 4% of biomass showed the best growth performance, except for the feed conversion rate. Results showed that for the percentage of 25% of the area of artificial substrates, there is an optimum feeding rate of between 5.13% and 5.54% of shrimp biomass, resulting in maximum production.

scholarly journals Transitions in diatom assemblages and pigments through dry and wet season conditions in the Red River, Hanoi (Vietnam)

2019 ◽  
Vol 152 (2) ◽  
pp. 163-177 ◽  
Author(s):  
Thi Thuy Duong ◽  
Hai Yen Nguyen ◽  
Thi Phuong Quynh Le ◽  
Trung Kien Nguyen ◽  
Thi Thu Huong Tran ◽  
...  
Keyword(s):  
Water Quality ◽  
River Water ◽  
Chlorophyll A ◽  
Suspended Solids ◽  
Light Availability ◽  
Red River ◽  
Artificial Substrates ◽  
Tropical Rivers ◽  
Wet Season ◽  
Hydrological Change

Background and aims – Biomonitoring is an important tool for assessing river water quality, but is not routinely applied in tropical rivers. Marked hydrological changes can occur between wet and dry season conditions in the tropics. Thus, a prerequisite for ecological assessment is that the influence of ‘natural’ hydrological change on biota can be distinguished from variability driven by water quality parameters of interest. Here we aimed to (a) assess seasonal changes in water quality, diatoms and algal assemblages from river phytoplankton and artificial substrates through the dry-wet season transition (February–July 2018) in the Red River close to Hanoi and (b) evaluate the potential for microscopic counts and high-performance liquid chromatography (HPLC) analysis of chlorophyll and carotenoid pigments for biomonitoring in large tropical rivers. Methods – River water (phytoplankton) and biofilms grown on artificial glass substrates were sampled monthly through the dry (February–April) to wet (May–August) season transition and analysed via microscopic and HPLC techniques. Key results – All phototrophic communities shifted markedly between the dry and wet seasons. Phytoplankton concentrations were low (c. thousands of cells/mL) and declined as the wet season progressed. The dominant phytoplankton taxa were centric diatoms (Aulacoseira granulata and Aulacoseira distans) and chlorophytes (Scenedesmus and Pediastrum spp.), with chlorophytes becoming more dominant in the wet season. Biofilm diatoms were dominated by Melosira varians, and areal densities declined in the wet season when fast-growing pioneer diatom taxa (e.g. Achnanthidium minutissimum, Planothidium lanceolatum) and non-degraded Chlorophyll a concentrations increased, suggesting active phytobenthos growth in response to scour damage. Otherwise, a-phorbins were very abundant in river seston and biofilms indicating in situ Chlorophyll a degradation which may be typical of tropical river environments. The very large range of total suspended solids (reaching > 120 mg/L) and turbidity appears to be a key driver of photoautotrophs through control of light availability. Conclusions – Hydrological change and associated turbidity conditions exceed nutrient influences on photoautotrophs at inter-seasonal scales in this part of the Red River. Inter-seasonal differences might be a useful measure for biomonitoring to help track how changes in suspended solids, a major water quality issue in tropical rivers, interact with other variables of interest.

scholarly journals Optimal control of fish-feeding in a three-dimensional calm freshwater pond considering environmental concern

2021 ◽  
Vol 0 (0) ◽  
pp. 0
Author(s):  
H. W. J. Lee ◽  
Kar Hung Wong ◽  
Y. C. E. Lee
Keyword(s):  
Water Quality ◽  
Environmental Concern ◽  
Three Dimensional ◽  
Fish Feeding ◽  
Feeding Problem ◽  
Control Parameterization ◽  
Water Quality Variables ◽  
Freshwater Pond ◽  
Final Weight ◽  
Feeding Program

<p style='text-indent:20px;'>This paper describes the optimal fish-feeding in a three-dimensional calm freshwater pond based on the concentrations of seven water quality variables. A certain number of baby fishes are inserted into the pond simultaneously. They are then taken out of the pond simultaneously for harvest after having gone through a feeding program. This feeding program creates additional loads of water quality variables in the pond, which becomes pollutants. Thus, an optimal fish-feeding problem is formulated to maximize the final weight of the fishes, subject to the restrictions that the fishes are not under-fed and over-fed and the concentrations of the pollutants created by the fish-feeding program are not too large. A computational scheme using the finite element Galerkin scheme for the three-dimensional cubic domain and the control parameterization method is developed for solving the problem. Finally, a numerical example is solved.</p>

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