The application of a phosphorus mass balance model for estimating the carrying capacity of Lake Kariba

Mhlanga, Lindah

doi:10.3906/vet-1110-37

Cited by 6 publications

(13 citation statements)

References 10 publications

(12 reference statements)

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“…The aquaculture carrying capacity of Temengor Reservoir was estimated based on Dillon and Rigler (1975) by examining the phosphorus budget before the fish cage establishment. The steady-state total phosphorus (TP) concentration and the capacity of the water The maximum acceptable total phosphorus [P] f in tropical water bodies used for the tilapia culture is 250 mg m −3 based on Beveridge (1984) and Mhlanga et al (2013). However, in this study, a TP level of 200 mg m −3 was used based on the recommendation by Malaysia's quality standard of phosphorus for freshwater (Mahmudi et al, 2019;Philminaq, 2006).…”

Section: The Relevant Morphometric and Hydrological Parameters Ofmentioning

confidence: 99%

“…Estimation of the aquaculture carrying capacity of Temengor Reservoir; where x = 0.90 (Kunz et al, 2011;Mhlanga et al, 2013) where R = 1/(1 + 0.75 ρ 0.507 ) = 1/(1 + 0.75 × 14.75 0.507 ) = 0.25 =0.9 + [(1-0.9) 0.25] =0.9 + 0.025 =0.93 From the above calculations, the aquaculture carrying capacity based on the phosphorus budget model for the whole area of Temengor Reservoir (1.52 × 10 8 m 2 ) was estimated at 24533.33 × 10 3 tonnes per year. This is 2600 times higher than the present fish production level, 9.13 × 10 3 tonnes per year.…”

Section: Estimated Carrying Capacity Of Tilapia Cage Culture Within T...mentioning

confidence: 99%

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Trophic state index ( TSI ) and carrying capacity estimation of aquaculture development; the application of total phosphorus budget

Hamid

Sah

Idris

et al. 2022

Aquaculture Research

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The aquaculture industry is crucial for sustainability and food security. Nevertheless, it is also one of the significant causes of water quality degradation, reducing water bodies' carrying capacity. One of the degradation factors is the improper discharge of phosphorus. This study aimed to evaluate the trophic state index (TSI) and carrying capacity for tilapia aquaculture development at the Temengor Reservoir, Malaysia, based on the Dillon–Rigler phosphorus budget model. The data permit the evaluation of the limit for fish production capacities that could retain acceptable water quality conditions. This study was carried out monthly from April 2014 to March 2015, focusing on cage sites within the Aquaculture Industrial Zone (AIZ). A total of 15 sampling points were established within a 5 km radius of the fish cages at 1 km horizontal intervals. The TSI values based on three indicators, total phosphorous, Secchi depth and chlorophyll‐a, showed a significant difference (p < 0.05) among sampling points. Areas in the vicinity of the fish cages (<3 km) were at a eutrophic state. However, the current aquaculture production at 9.13 × 103 tonnes per year, which comprises three fish cage modules, has not yet reached the optimum capacity of 325.23 × 103 tonnes per year. Although the lake could accommodate another 105 fish cages, the eutrophic state near the cages signalled water quality deterioration. As there is a plan to increase the number of cages, it is hoped that these findings will be taken into serious consideration in the implementation of any aquaculture expansion in this man‐made lake. [Correction added on 13 September 2022, after first online publication: study date range has been updated.]

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Section: The Relevant Morphometric and Hydrological Parameters Ofmentioning

confidence: 99%

Section: Estimated Carrying Capacity Of Tilapia Cage Culture Within T...mentioning

confidence: 99%

Trophic state index ( TSI ) and carrying capacity estimation of aquaculture development; the application of total phosphorus budget

Hamid

Sah

Idris

et al. 2022

Aquaculture Research

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“…Pengurangan beban pencemar TP dilihat dari sumber terbesar yaitu KJA sehingga perlu dilakukan pembatasan jumlah KJA. Jumlah pengurangan TP untuk kondisi mesotrofik pada penelitian ini menurun jika dibandingkan dengan penelitian sebelumnya yaitu 74% (Machbub, 2010) (Mhlanga et al, 2013). Luas area danau juga salah satu faktor penentu daya tampung, Danau Maninjau memiliki luas 9.763.000 m 2 sedangangkan Granu Jati hanya memiliki luas 1.734.223.07 m 2 (Mahmudi et al, 2019).…”

Section: Daya Tampung Total Nitrogen Dan Total Fosfatunclassified

Analisis Beban Pencemar Total Nitrogen dan Total Fosfat akibat Aktivitas Antropogenik di Danau Maninjau

2021

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Penelitian ini bertujuan untuk menganalisis beban pencemar dan daya tampung total nitrogen (TN) dan total fosfat (TP) akibat dari aktivitas antropogenik di Danau Maninjau. Perhitungan beban pencemar untuk aktivitas penduduk, pertanian, peternakan dan jumlah tamu hotel menggunakan Rapid Assesment. Penetapan beban pencemar KJA dan daya tampung yang mengacu kepada Peraturan Menteri Lingkungan Hidup No 28 Tahun 2009. Lokasi penelitian yang ditetapkan berdasarkan SNI 6989.57:2008 terdiri dari 10 lokasi yaitu tengah danau, PLTA, KJA, inlet dan outlet danau. Uji ANOVA dengan tingkat kepercayaan 95% digunakan dalam melihat perbedaan data konsentrasi TN dan TP secara waktu pengambilan sampel dan lokasi sampling. Rasio TN:TP dievaluasi untuk mengetahui pembatas kesuburan perairan dan korelasinya terhadap klorofil.Konsentrasi TN berada pada rentang 0,42 – 0,95 mg/L, TP berkisar 0,18-0,66 mg/L dan klorofil-a 5,49-8,69 mg/m3. Hasil uji ANOVA, konsentrasi TN dan TP secara waktu pengambilan sampel tidak berbeda secara signifikan yaitu 0,64 dan 0,88 sedangkan secara lokasi sampling berbeda secara signifikan dengan nilai signifikansi 0,01 dan 4,03x10-6. TN dan TP memiliki hubungan yang kuat terhadap klorofil dan diperoleh rasio TN:TP<10 yang mengindikasikan nitrogen sebagai pembatas kesuburan. Beban pencemar TN dan TP terbesar berasal dari KJA yang menyumbang hampir 84,20 % dan 91,83% dari total beban pencemar. Ditinjau dari daya tampung mesotrofik beban pencemar TN belum melebihi sedangkan TP telah melebihi daya tampung sehingga perlu pengurangan hingga 71,34% untuk mesotrofik dan 90,44% untuk oligotrofik. Secara keseluruhan status trofik Danau Maninjau berada pada kondisi eutrofik dengan index 63,39. ABSTRACTThis study aims to analyze the pollutant load and the capacity of total nitrogen (TN) and total phosphate (TP) resulting from anthropogenic activities in Lake Maninjau. Calculation of the pollutant load for the activities of the population, agriculture, livestock and the number of hotel guests using Rapid Assessment. Determination of KJA pollutant load and carrying capacity refers to the Regulation of the Minister of Environment No. 28 of 2009. The research locations determined based on SNI 6989.57: 2008 consist of 10 locations, namely the middle of the lake, hydropower plant, marine cage, inlet and outlet. ANOVA test with a 95% confidence level was used to see the differences in TN and TP concentration data in terms of sampling time and sampling location. The TN: TP ratio was evaluated to determine the limitation of water fertility and its correlation to chlorophyll. TN concentrations were in the range 0.42 - 0.95 mg / L, TP ranged from 0.18 to 0.66 mg / L and chlorophyll-a was 5.49. -8.69 mg / m3. ANOVA test results, TN and TP concentrations at sampling time did not differ significantly, namely 0.64 and 0.88, while the sampling location was significantly different with a significance value of 0.01 and 4.03x10-6. TN and TP had a strong relationship to chlorophyll and the TN: TP ratio was obtained <10, which indicates nitrogen as a fertility limiter. The largest TN and TP pollutant load comes from KJA which accounts for almost 84.20% and 91.83% of the total pollutant load. Judging from the mesotrophic capacity of the TN pollutant load has not exceeded while the TP has exceeded the capacity so that it needs a reduction of up to 71.34% for mesotrophic and 90.44% for oligotrophic. Overall, the trophic status of Lake Maninjau is in a eutrophic condition with an index of 63.39.

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“…The authors estimated the support capacity of each place, and, finally, the maximum capacity that could be produced in the whole reservoir. Using the same approach, support capacities for net-tank fish farming have been calculated in several environments (MHLANGA et al, 2013, FEIDEN et al, 2015, GUNKEL et al, 2015. Results of this type of model are strongly dependent on the estimation of phosphorus emission by the cultivated animals, which may be important information for the model than for parameters, such as water volume of lakes or reservoirs.…”

Section: Modelling Of Aquatic Ecosystems Submitted To Aquaculture Actmentioning

confidence: 99%

Food web and ecological models used to assess aquatic ecosystems submitted to aquaculture activities

Moura

Henry-Silva

2019

Cienc. Rural

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Continental aquatic ecosystems play a fundamental role in economic and social development; however, they are vulnerable to environmental degradation due to the various stresses to which they are submitted. Aquaculture is among the main anthropic activities that influence these environments. Mathematical modelling of aquatic ecosystems performed using a set of computational tools allows simplified representation of environment regarding its biotic and abiotic components. Some of the most used techniques are: hydrodynamic modelling, focusing on the dispersion of nutrients; nutrient-mass balance modelling, especially phosphorus; bioenergetic modelling in animal production systems, with an estimate of the generation of residues in the environment by farmed animals; and trophic and ecological modelling, focusing on aquatic communities and their interactions. These techniques help understand changes caused by aquaculture systems in aquatic environments. In this way, it is possible to estimate the magnitude and extent of the impacts of these activities by simulating the possible environmental changes over time. It can be concluded that techniques involving mathematical modelling can provide relevant information for future impacts prediction on aquatic environments, promoting the management of water resources and their multiple uses.

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The application of a phosphorus mass balance model for estimating the carrying capacity of Lake Kariba

Cited by 6 publications

References 10 publications

Trophic state index ( TSI ) and carrying capacity estimation of aquaculture development; the application of total phosphorus budget

Trophic state index ( TSI ) and carrying capacity estimation of aquaculture development; the application of total phosphorus budget

Analisis Beban Pencemar Total Nitrogen dan Total Fosfat akibat Aktivitas Antropogenik di Danau Maninjau

Food web and ecological models used to assess aquatic ecosystems submitted to aquaculture activities

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