Rhizons improved estimation of nutrient losses because of seepage in aquaculture ponds

Muendo, Patricia; Stoorvogel, J.J.; Gamal, Naggar E; Verdegem, Marc

doi:10.1111/j.1365-2109.2005.01337.x

Cited by 12 publications

(8 citation statements)

References 13 publications

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“…For phosphorus, the seepage water was 21 times more concentrated than pond water (Muendo et al . ). Assuming an annual seepage loss of 1000 mm, and a dietary N and P input of 23 and 4.5 g m −2 year −1 , respectively, then 28% of N fed and 44% of P would be lost through seepage (Verdegem & Bosma ).…”

Section: Nutrient Loading and Nutrient Dischargementioning

confidence: 97%

“…In tilapia ponds built on alluvial soils in the Nile delta, the concentration of nitrogen in the seepage water was 6.5 times higher than in water 2-10 cm above the sediment. For phosphorus, the seepage water was 21 times more concentrated than pond water (Muendo et al 2005). Assuming an annual seepage loss of 1000 mm, and a dietary N and P input of 23 and 4.5 g m À2 year À1 , respectively, then 28% of N fed and 44% of P would be lost through seepage (Verdegem & Bosma 2009).…”

Section: Stagnant Pondsmentioning

confidence: 99%

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Nutrient discharge from aquaculture operations in function of system design and production environment

Verdegem

2013

Reviews in Aquaculture

132

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In aquaculture, nutrient loading is defined as the difference between nutrients supplied with fertilizers and feed and nutrients harvested in the form of finfish, crustaceans, molluscs and seaweeds. On average, the production of finfish and crustaceans results in a net nutrient loading, while for the production of molluscs and seaweeds the nutrient loading is negative. In marine and brackish water aquaculture, on a global scale, more nutrients are extracted than added to the environment. However, in freshwater, more nutrients are loaded than extracted. In 2008, the global aquaculture production of finfish and crustaceans resulted in an environmental loading of 1.7 million metric tonnes of nitrogen (N) and 0.46 million metric tonnes of phosphorus (P). This nitrogen loading represents 0.9% of the human input to the N‐cycle and 0.4% of the global N‐cycle. For phosphorus, the loading from finfish and crustacean aquaculture represents 2.3% of the global annual fertilizer supply. With cage aquaculture, nutrients are directly discharged to the environment. Mitigation measures should be shared equally between all polluters involved. For land‐based aquaculture, the development of water re‐use systems is still in its infancy. Although still a minor contributor to global aquaculture production, recirculation technology shows that control and mitigation of pollution from aquaculture is possible. A 15–20 year goal should be to have all inland aquaculture operations applying water re‐use and purification technology and generating useful (waste) outputs in addition to standard aquaculture products.

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Section: Nutrient Loading and Nutrient Dischargementioning

confidence: 97%

Section: Stagnant Pondsmentioning

confidence: 99%

Nutrient discharge from aquaculture operations in function of system design and production environment

Verdegem

2013

Reviews in Aquaculture

132

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“…However, in the present study we found that sludge contain less nutrient than water, this can be attributed to the very short period of the fry collection, every 15 days, compared to the fish growing season, that may last for 4 months, that did not provide enough time for solid settlement. Muendo et al (2005) reported that in tilapia ponds in the Nile delta, never drained, the concentration of nitrogen in the seepage water is 6.5 times higher than in water 2-10 cm above the sediment. As the results showed (Table 1), the sludge contained 11.3 ± 0.78 % of the feed nitrogen, as a total of fish excretion and uneaten feed settled at the tank bottom.…”

Section: Nitrogen Budgetmentioning

confidence: 99%

Nitrogen and Phosphorus budget for Nile tilapia hatchery

Moustafa

Ali

Gomha

et al. 2020

Egyptian Journal for Aquaculture

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Tilapia hatcheries if not well managed, it can cause environmental damage. The present study was designed to quantify the impacts generated by Nile tilapia hatcheries, through applying environmental indicators, which is necessary for tilapia hatcheries sustainable development. Three culture trials, each of 15 days, have been carried out to determine environmental indicators: the nitrogen and phosphorus flux and nutrient mass balance based on inputs from feed and losses in fish harvest, nutrients load in the effluent water, and fish bio-solid wastes (sludge). In each, three cement ponds were assigned to determine the nutrients input and loss for 15 days intervals, fry production cycle. The results showed that every 1 Kg feed of 35% protein produce 420 g sludge, of which 262 gm fish excretion. Uneaten feed was found to represent 15.8-20% of the introduced feed and produce 37.6 -43.2 % of sludge. Fish retained at least 25.8 ± 3.91 % and 2.74 ± 0.37 % of the input feed nitrogen and phosphorus, respectively. While the sludge contained 11.3 ± 0.78 % and 32.62 ± 14.46 of the feed nitrogen and phosphorus, respectively. Effluent water contained 43.64 ± 6.45 % and 50.22 ± 16.63 % of feed nitrogen and phosphorus, respectively, distributed in three main fractions: particulate form; dissolved organic and dissolved inorganic forms. The feed nitrogen recovery in the present study was 80. 57%, while the phosphorus recovery reached 85.58% of the feed phosphorus content. Fry production is discussed in response to the feed protein content and feeding rate.

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“…The Comparative Sustainability of Cage-and PondBased Tilapia Culture Although significant nutrient losses may occur in ponds through seepage (Muendo et al 2005) and, periodically, when water is exchanged or drained, cages discharge a far greater proportion of nutrients into receiving waters than do semi-intensively managed ponds (Edwards 1993) and are thus, in general terms, more likely than ponds to promote or add to the eutrophication of surrounding water bodies. This may alter the makeup of ecological communities and their function and, in the most severe cases, result in oxygen depletion that kills fish and other aquatic organisms (Gong and Zie 2001;Helminen et al 2000).…”

Section: Prioritizing Sustainability Issuesmentioning

confidence: 99%

Passing the Panda Standard: A TAD Off the Mark?

Belton

Murray

Young

et al. 2010

AMBIO

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Tilapia, a tropical freshwater fish native to Africa, is an increasingly important global food commodity. The World Wide Fund for Nature (WWF), a major environmental nongovernmental organization, has established stakeholder dialogues to formulate farm certification standards that promote ''responsible'' culture practices. As a preface to its ''tilapia aquaculture dialogue,'' the WWF for Nature commissioned a review of potential certification issues, later published as a peer-reviewed article. This article contends that both the review and the draft certification standards subsequently developed fail to adequately integrate critical factors governing the relative sustainability of tilapia production and thereby miss more significant issues related to resource-use efficiency and the appropriation of ecosystem space and services. This raises a distinct possibility that subsequent certification will promote intensive systems of tilapia production that are far less ecologically benign than existing widely practiced semiintensive alternatives. Given the likely future significance of this emergent standard, it is contended that a more holistic approach to certification is essential.

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Rhizons improved estimation of nutrient losses because of seepage in aquaculture ponds

Cited by 12 publications

References 13 publications

Nutrient discharge from aquaculture operations in function of system design and production environment

Nutrient discharge from aquaculture operations in function of system design and production environment

Nitrogen and Phosphorus budget for Nile tilapia hatchery

Passing the Panda Standard: A TAD Off the Mark?

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