scholarly journals Ecological intensification in multi-trophic aquaculture ponds: an experimental approach

2018 ◽  
Vol 31 ◽  
pp. 36 ◽  
Author(s):  
Christophe Jaeger ◽  
Joël Aubin
Keyword(s):  
Ecosystem Services ◽  
Rutilus Rutilus ◽  
Fish Growth ◽  
Fish Biomass ◽  
Nitrogen And Phosphorus ◽  
Nutrient Contents ◽  
Pond System ◽  
Growth Performances ◽  
Nutrients Cycling ◽  
Formulated Feed

As aquaculture production is increasing considerably, it needs to become more environment-friendly. Based on a participatory process, an ecologically intensive pond system was designed to test three hypotheses: a combination of intensive and extensive areas provides more ecosystem services than an intensive or extensive area alone; coupling a planted lagoon with an intensive pond decreases the latter's environmental impacts and maintains or increases its fish productivity; and using formulated feed in polyculture increases growth of all fish species. To test these hypotheses, we designed a specific integrated multi-trophic aquaculture system composed of a polyculture of common carp (Cyprinus carpio), roach (Rutilus rutilus) and tench (Tinca tinca) and a lagoon planted with macrophytes to filter the water. This pond system was compared with “extensive” (unfed) and “semi-intensive” fishpond systems without a planted lagoon. We measured fish growth performances, water quality, chlorophyll concentrations and water and sediment nutrient contents. We also calculated the mass balance of nutrients. Concentrations of total nitrogen and phosphorus increased in sediments, indicating that nutrients were stored in the ponds, especially in planted lagoon; the planted lagoon decreased phytoplankton development, and limited blooms, but it slightly decreased fish growth performances compared to those in semi-intensive fishponds. The formulated feed supplied clearly increased fish growth performances and the survival rate, and seemed also to increase the use of available nutrients in ponds, which improved the production of overall fish biomass. In conclusion, the planted lagoon provides ecosystem services on nutrients cycling and habitat for natural biodiversity. Improving knowledge about nutrient cycles from formulated feed within the pond food web would be useful to increase the amounts of nutrients converted into fish biomass.

scholarly journals Effects of different feed items on the growth and survival of endangered riverine catfish Rita rita (Hamilton)

1970 ◽  
Vol 28 ◽  
pp. 11-14 ◽  
Author(s):  
MR Amin ◽  
MFA Mollah ◽  
MR Ali ◽  
M Nahiduzzaman
Keyword(s):  
Early Morning ◽  
Initial Length ◽  
Growth And Survival ◽  
Growth Performances ◽  
Significant Difference ◽  
Final Weight ◽  
Final Length ◽  
The Mean ◽  
Chicken Viscera ◽  
Formulated Feed

The study was conducted to determine a suitable feed for the desirable growth ofriverine catfish Rita rita (Hamilton) from January 2006 to December 2006. The experiment hadthree treatments with three replicates. Nine chambers of the raceway each of size 1.83 × 1.12 sqmeter were used. Local prawn, chicken viscera and commercially available formulated feed (CP)were supplied in treatment T1, T2 and T3, respectively at the rate of 7% body weight. Feed wassupplied twice in a day in the early morning and in the evening as the fish is nocturnal. The initialaverage weight of fish was 24.93±0.05g, 24.99±0.04g and 24.95±0.04g in T1, T2 and T3,respectively. The final weight of the fish under three treatments was 425.05±1.04g, 425.68±1.05gand 177.61±1.45g respectively. The initial length was 8.48±0.02, 8.49±0.02 and 8.50±0.01 in T1, T2and T3, respectively. The final length was 25.22±0.06 cm, 25.21±0.14 cm and 14.87±0.13 cm in T1,T2 and T3, respectively. The mean final weight and length was significantly (p<0.05) higher in T1and T2 compared with T3. However, there was no significant difference (p>0.05) between T1 and T2in terms of final weight and length was concerned. Better growth performances, however, wereobserved in T2 and T1, where prawn and chicken viscera were supplied as feed respectively.Lowest growth performance was observed in T3 where formulated feed (CP feed) was supplied.Key Words: Riverine Catfish; Feed; Growth; SGR; Survival.DOI: 10.3329/ujzru.v28i0.5279Univ. j. zool. Rajshahi Univ. Vol. 28, 2010 pp. 11-14

An ecosystem-based approach to support water quality assessment and management under climate and land-use condition

2020 ◽  
Author(s):  
Andrea Critto ◽  
Hung Vuong Pham ◽  
Anna Sperotto ◽  
Silvia Torresan ◽  
Elisa Furlan ◽  
...  
Keyword(s):  
Land Use ◽  
Ecosystem Services ◽  
Best Management Practices ◽  
Water Demand ◽  
Management Practices ◽  
Freshwater Ecosystems ◽  
Water Yield ◽  
Management Scenarios ◽  
Nitrogen And Phosphorus ◽  
Change Models

&lt;p&gt;Freshwater ecosystems can be negatively affected by climate change and human interventions through the alteration of water supply and demand. There is an urgent need to protect the ecosystems, and the services they provide, to maintain their essential contribution to human wellbeing and economic prosperity, especially in a rapid and unpredictable global change context. In this work, we developed an integrated approach, coupling the outputs of ecosystem services (InVEST), climate (COSMO-CLM) and land use (LUISA) change models utilizing Bayesian Networks (BNs), to map freshwater-related Ecosystem Services (ESs), namely, water yield, nitrogen and phosphorus retention, and to assess their changes until 2050 under different management scenarios. First, InVEST was calibrated and validated with climate and land-use data to map and quantify ESs. Second, outputs of the ES model were integrated into the BN and the changes induced by different learning techniques and input settings were investigated. Finally, thousands of different scenarios were simulated testing multiple input variables configurations, thus allowing to describe the uncertainty of climate conditions, land-use change and water demand. Two types of inferences were conducted, namely, diagnostic and prognostic inference. The former permitted to find the best combination of the key drivers (i.e. &amp;#160;precipitation, land-use, and water demand) so that ESs are maximized while the latter concentrated on the quantification of ESs under different scenarios. This approach was applied and validated in the Taro River basin in Italy. The results show that the values of all the three types of ESs would decline in the medium-term period under most scenarios. Moreover, there would be a limit of space to improve those values, especially for nutrient retention services. The obtained results provide valuable support to identify and prioritize the best management practices for sustainable water use, balancing the tradeoffs among services. This analysis allows decision-makers to pick up one scenario with a specific configuration of land-use and water demand to optimize relevant ESs within their basin. Finally, these decisions are transformed into a &amp;#8220;decision space&amp;#8221; where the values of selected services are plotted in the space of ES to represent the gain/loss of each decision.&lt;/p&gt;

scholarly journals Effect of tannery wastes and biochar on soil chemical and physicochemical properties and growth traits of radish

2015 ◽  
Vol 29 (3) ◽  
pp. 333-339 ◽  
Author(s):  
Fereshteh Nabavinia ◽  
Hojat Emami ◽  
Alireza Astaraee ◽  
Amir Lakzian
Keyword(s):  
Physicochemical Properties ◽  
Waste Treatment ◽  
Growth Traits ◽  
Field Capacity ◽  
Nitrogen And Phosphorus ◽  
Nutrient Contents ◽  
Tannery Waste ◽  
Radish Root ◽  
Randomized Design ◽  
Tannery Wastes

Abstract Tannery wastes can be used in soil as organic manure. The aim of this research was to study the effects of tannery wastes (before a chromium addition step) and biochar on soil chemical and physicochemical properties and radish yield. Treatments included three levels of tannery waste (0, 2.5, and 5%) and two levels of biochar (0 and 2.5 t ha−1) in a completely randomized design (factorial) with three replications. The treated pots were kept under field capacity condition for three months; thereafter, five radish seeds were sown at 1 cm depth in soil of each pot. The results showed that tannery wastes and biochar treatments resulted in an increase in soil nitrogen and phosphorus contents and their concentrations in radish root and above ground biomass, but electrical conductivity of soil was decreased and had no effect on soil potassium content. The tannery waste treatment increased soil pH after plant harvest. It also significantly increased radish fresh and dry matter weight, but the biochar treatment yielded a slight increase. It is concluded that application of tannery wastes and biochar may be useful due to their high nutrient contents in soils lacking organic carbon under arid and semi-arid regions, thereby improving growth and increasing plant yield.

scholarly journals PERFORMANCE OF AN INTEGRATED AQUACULTURE~ OLERICULTURE SYSTEM AS INFLUENCED BY COMPONENT RATIO

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1151F-1151 ◽  
Author(s):  
Mark McMurtry ◽  
Douglas Sanders
Keyword(s):  
Growth Rates ◽  
Protein Production ◽  
Fish Growth ◽  
Caloric Content ◽  
Fish Biomass ◽  
Component Ratio ◽  
Vegetable Production ◽  
Nutrient Inputs ◽  
Tomato Production ◽  
Integrated Aquaculture

Fish and vegetable production were linked in a recirculating water system. Hybrid tilapia were grown in tanks and fed a commercial feed. Tomato or cucumber were grown in sand biofilters associated with each tank. Four tank to biofilter volume ratios, ranging from 1:0.67 to 1:2.25, were studied by varying the biofilter size. Plant populations were directly proportional to biofilter volume and surface irrigated 8 times daily with aquacultural `waste' water, Biofilter drainage returned to the fish tanks by gravity. Each system received identical nutrient inputs and plants received equal water. Biological filtration, aeration, and mineral assimilation by plants maintained water quality under rapid fish growth rates. Dissolved oxygen levels, make-up water, fish biomass increase and growth rates increased with biofilter volume. Total fruit yield increased but yield per plant decreased with increasing biofilter volume. Caloric content of the increase in fish biomass per liter of total water decreased white that of tomato increased with increasing biofilter volume. Calories in the combined yields per liter of water used did not differ by treatment. Total protein production per liter of water used decreased with increasing biofilter volume. Both caloric value and protein production in the combined outputs increased with biofilter volume irrespective of water consumption. Annualized economic value from the combined fish and `Laura' tomato production per composite unit area ranged from $98 to $124 m-2 with decreasing tank to biofilter ratio.

scholarly journals Physical and Biogeochemical Characterization of a Tropical Karstic Marsh in the Yucatan Peninsula, Mexico.

2021 ◽  
Author(s):  
Eduardo Cejudo ◽  
Daniela Ortega-Camacho ◽  
Eduardo Arturo García-Vargas ◽  
Elizabeth Hernández-Alarcón
Keyword(s):  
Ecosystem Services ◽  
High Water ◽  
Quintana Roo ◽  
Water Retention Capacity ◽  
Base Line ◽  
Retention Capacity ◽  
The North ◽  
Nutrients Cycling ◽  
Flood Regulation ◽  
Almost All

Abstract Karstic wetlands provide important ecosystem services such as maintenance of hydrological balance, flood regulation, drinking water supply and nutrients cycling. It is important to conserve and maintain karstic wetlands due to its interaction with groundwater systems and its socioeconomic relevance. The objective of this research was to generate base-line knowledge of the microtopography, hydroperiod and biogeochemical characteristics of poorly known tropical karstic marshes by testing two hypotheses, the phreatotrophic nature of tropical karstic marshes, and the alteration of its biogeochemistry by a highway dividing the marsh. The study site is located in the north of the state of Quintana Roo (Mexico), in pseudo-paludal depressions associated to fractures. The water level varied from few centimeters below the ground to more than 100 cm. We demonstrate that the wetland is groundwater-fed with differences among groundwater, interstitial and surface water in almost all parameters measured. The water is calcium bicarbonate type; the main processes occurring are recharge, evaporation and rock dissolution. Our results suggests active denitrification, low phosphates attributed to Ca- and Fe/Al-bound P, elevated alkalinity and sulfate reduction due to anaerobic conditions in water and soil. The soil reflect its sedimentary origin, the bulk density is low with very high water retention capacity. We do not have enough evidence of the highway modifying the biogeochemistry or hydrology of the marsh. These karstic wetlands provide important provisioning and supporting ecosystem services that should be studied, acknowledged and maintained.

scholarly journals Characterization of Organic Wastes and Effects of Their Application on the Soil

2018 ◽  
Vol 10 (6) ◽  
pp. 291
Author(s):  
Lucas De Sousa Oliveira ◽  
Mirian Cristina Gomes Costa ◽  
Henrique Antunes de Souza ◽  
Julius Blum ◽  
Gustavo Henrique da Silva Albuquerque ◽  
...  
Keyword(s):  
Chemical Elements ◽  
Small Ruminants ◽  
Sodium Content ◽  
Organic Wastes ◽  
Shrimp Farming ◽  
Organic Fertilizers ◽  
Organic Carbon Content ◽  
Nitrogen And Phosphorus ◽  
Nutrient Contents ◽  
Semi Arid Region

The agricultural farming activities generate organic waste whose indiscriminate deposition can be prejudicial to the environment. However, careful application of these wastes as organic fertilizers it is a possibility to improve soil fertility. This study aimed to confirm the hypotheses that organic wastes produced in various production chains in the semi-arid region of Ceará have contents of nutrients that give them potential as organic fertilizers and, since they are used as organic fertilizers, these residues improve the chemical soil attributes. Nutrient contents were determined at the laboratory and then the wastes were placed in decomposition bags and applied in a Fluvic Neosol. Soil samples were collected in the 0-0.10 m layer 90 days after wastes were applied. The residues presented nutrient contents that allow their use as organic fertilizers, except the shrimp farming residue that presented sodium content above that allowed by legislation, resulting also in higher element contents in the soil. In addition, the shrimp farming showed the lowest organic carbon content in relation to others chemical elements. The residues of the poultry industry and the compound made with residues of small ruminants presented the highest of nitrogen and phosphorus levels. The carnauba residue was associated with phosphorus immobilization because it presented C/P ratio higher than 300.

IMPROVING THE EFFICIENCY OF USE OF SMALL AMOUNTS OF NITROGEN AND PHOSPHORUS FERTILISER ON SMALLHOLDER MAIZE IN CENTRAL MALAWI

2013 ◽  
Vol 50 (2) ◽  
pp. 229-249 ◽  
Author(s):  
B. C. G. KAMANGA ◽  
S. R. WADDINGTON ◽  
A. M. WHITBREAD ◽  
C. J. M. ALMEKINDERS ◽  
K. E. GILLER
Keyword(s):  
Weed Management ◽  
Financial Analysis ◽  
N Uptake ◽  
Maize Yield ◽  
Open Market ◽  
Nitrogen And Phosphorus ◽  
Soil System ◽  
Nutrient Contents ◽  
Maize Yields ◽  
Yield Responses

SUMMARYMineral fertiliser is a scarce input for smallholder maize farmers in Malawi. A recent provision of small amounts of subsidised fertilisers by government programmes to farmers throughout Malawi has increased fertiliser access and raised maize production, but fertiliser management and yield responses frequently remain poor. To seek ways to use the fertiliser more efficiently, we analysed the effects of low rates of N (15 or 30 kg N ha−1) and P (9 kg P ha−1) fertiliser in combination with improved weed management on maize yields in experiments on 12 smallholder farms in Chisepo, central Malawi. Several indices of N and P use efficiency were computed from the above-ground crop components and nutrient contents. Maize yield simulations were conducted using long-term rainfall records in the APSIM crop-soil system model. NP fertiliser significantly (p < 0.001) raised maize grain yield from 0.65 to 1.5 t ha−1, and twice-weeding fertilised maize significantly (p < 0.001) raised maize yields by 0.4 t ha−1 compared with weeding once (0.9 t ha−1). The agronomic efficiency of applied fertiliser N (AEN) averaged 19.3 kg grain kg N−1 with one weeding but doubled to 38.7 kg with the additional weeding. The physiological efficiency of applied N (PEN) was 40.7 kg grain kg−1 N uptake. APSIM predicted that similar or larger maize yield responses to 15 or 30 kg N ha−1 can be expected in 8 out of 10 years in areas with similar rainfall patterns to Chisepo. A financial analysis showed that the application of these small amounts of fertiliser was economic even when fertiliser was purchased from the open market, provided the crop was adequately weeded. Participatory assessments helped farmers understand the increased efficiency of fertiliser use possible with additional weeding, although some farmers reported difficulty implementing this recommendation due to competing demands for labour. We conclude that to raise the productivity and sustainability of fertiliser support programmes in Malawi, initiatives should be introduced to help identify and educate farmers on the major drivers of productivity in their systems.

scholarly journals Analysis of water quality of a reservoir on a small river and the status of ichthyofauna in anthropogenic conditions

2019 ◽  
Vol 2 (3) ◽  
pp. 28-31
Author(s):  
I. O. Parfenyuk ◽  
Yu. R. Grokhovskaya ◽  
Yu. M. Mandygra
Keyword(s):  
Water Quality ◽  
Surface Waters ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Significant Loss ◽  
Biogenic Elements ◽  
Nitrogen And Phosphorus ◽  
Blue Green Algae ◽  
Fishery Resources ◽  
Organoleptic Characteristics

The surface waters of the estuaries of the estuary are mostly characterized by low quality, which was formed as a result of considerable anthropogenic loading and transformation of the catchment area. The monitoring data of the ecological and sanitary status of the surface waters of the Basov Kut reservoir are presented, as well as the results of accounting for dead fish due to the frosts that occurred in the mouth of the Ustye River during 2011–2017. It is established that the Bas Basin is not suitable for recreational use. Amateur fisheries are also a danger to the population, as lactose-positive E. coli, the Staphylococcus aureus index, the Enterococcus microorganism index, Lamblia intestinalis cysts and eggs are detected in this reservoir annually. In 2017, cholera vibrios (Vibrio cholera non O1) were detected. Hydrochemical indicators, in particular in 2018, revealed inconsistency with the following indicators: odor – 2 points; color 3; BOD5 – 6.5–7.5 mgO2/dm³; COD 40–50 mgO2/dm³. In samples tested for sanitary – microbiological and parasitological parameters, cholera – like vibrio (non O1) was detected. The deterioration of water quality by the content of biogenic elements, in particular, compounds of Nitrogen and Phosphorus, which leads to increased eutrophication of the reservoir. The “flowering” of water in 2018 began in the third decade of June and lasted until October. This process harms not only hydrobionts, but also humans, as blue-green algae toxins can accumulate in fish tissues and cause poisoning when consumed by such products. In addition, there was a significant percentage of fish that did not meet the requirements of DSTU 2284: 2010 in terms of organoleptic characteristics. The greatest damage to the populations of fish that inhabit the Estuary during the fatalities was caused in 2012. When the estimated loss of fishery resources amounted to 377.4 thousand individuals, according to scientists and control bodies. Annual fatalities have led to quite significant losses of populations of industrially valuable fauna. A significant loss of fishery resources was noted in 2017 – about 10.32 thousand. It was noted that the following populations of fish were most affected by the frost in the estuary: Rutilus rutilus, Scardinius erythrophthalmus, Leucaspius delineatus, Perca fluviatilis, Carassius gibelio, Tinca tinca, Esox lucius, Sander luciocaper, Abracerperis This poses a significant threat to the further reproduction of ichthyofauna in the mouth of the Ustya River, and also calls into question the possibility of amateur fishing in these sites.

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