Diurnal dynamic of inorganic carbon and oxygen dissolved in a Nile tilapia (Oreochromis niloticus Linnaeus, 1758) fish pond, São Paulo, Brasil

Rodrigues, Claudinei José; Mercante, Cacilda Thais Janson; Carmo, Clóvis Ferreira do; Tucci, Andréa; Osti, João Alexandre Saviolo; Genaro, Ariane Carolina Di

doi:10.4322/actalb.2011.010

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…like as trout farming, continuous renewal of the water decreases the residence time of water in the system and consequently hinders the permanence of phytoplankton (Boyd & Queiroz, 2001). A different situation occurs in lentic systems, such as in the production of tilapia in excavated ponds, where primary production is a major factor related to the variations over the day (Rodrigues et al, 2010;Mercante et al, 2011). The largest saturation percentages of dissolved oxygen were obtained in the affluent and fingerlings sector (Table 1), while the highest consumption occurred in the juveniles sector (Table 3) (Figure 4) due to higher stocking density and the highest rate of feeding (Araripe et al, 2006;Bartoli et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Daily mass balance of phosphorus and nitrogen in effluents of production sectors of trout farming system

et al. 2015

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Aim: The mass balance has recently been applied in Brazilian aquaculture. In relation to trout farming, few studies have used this methodology as environmental indicator, especially when considering each development stage of fish. The daily mass balance allows an estimate of nutrients discharge, because the sampling effort over 24 hours enables to monitor the variations throughout the day. This study aimed to identify the breeding sector (fingerlings, juveniles and adults) in trout farming contributes with the great discharge of phosphorus and nitrogen in the effluent. Methods The concentrations of total phosphorus (TP), orthophosphate (PO4-P), total nitrogen (TN) and ammonium (NH4-N) were determined in affluent and effluents of the production system. The environmental indicators were calculated based on the values of nutrients loads and by quantifying the daily discharge of nutrients from the mass balance method. Results Over the 24 hours, the trout farming exported an average of 0.26 kg TP, 0.11 kg PO4-P, 3.11 kg TN and 0.18 kg NH4-N. The discharge of phosphorus and nitrogen in the effluent was higher at night associated to feeding management (hours and feeding frequency) and the nocturnal habits of trout. The juvenile and adult sectors accounted for the greatest contribution of these nutrients, related the largest fish biomass and metabolism, supported by the feed conversion ratio of 1.95:1 and 2.01:1, respectively. Conclusion In order to reduce exports of phosphorus and nitrogen there is a need to adequate the feeding management (feeding frequency from two to four times per day according to the trout development stage; carry out feeding in times close at twilight due to the nocturnal habits of this specie; reduce excess of ration offered and use good quality ration considering the distinct nutritional requirements of each trout stage of development). Besides the mass balance, the feed conversion ratio is also an efficient tool to detect the efficiency of feed utilization; therefore, it is proposed its use as environmental indicator, aiming the aquaculture environmental sustainability.

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Section: Discussionmentioning

confidence: 99%

Daily mass balance of phosphorus and nitrogen in effluents of production sectors of trout farming system

et al. 2015

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“…The direct change is the assimilation of nutrients that are present in the water body, which are used in the growth metabolism of macrophytes and their associated periphyton. The assimilation of nutrients by autotrophic organisms, such as macrophytes and algae, in general, is associated with the activity of chloroplast through reactions that are activated by light, as well as the balance of CO2/HCO3 -/CO3 2-, which influences the pH, associated with photosynthesis/respiration processes (Henry-Silva and Camargo, 2008;Rodrigues et al, 2010). Aquatic macrophytes with large biomass Artificial floating islands as a tool for … Rev.…”

Section: Discussionmentioning

confidence: 99%

“…The indirect action of macrophytes in the water, on the other hand, occurs through competition between macrophytes and phytoplankton, either for nutrients or for photosynthetic radiation (Abdel-Tawwab, 2006). In fishponds, phytoplankton are of fundamental importance for maintaining water quality, since they can significantly alter the concentration of nutrients, gases and water pH during photosynthesis/respiration processes (Boyd and Tucker, 1998;Rodrigues et al, 2010), and when in bloom formation, they can lead to a decrease in productivity performance and fish mortality with a consequent decrease in the profitability of the activity (Mercante et al, 2007;Boyd, 2006).…”

Section: Discussionmentioning

confidence: 99%

Artificial floating islands as a tool for the water quality improvement of fishponds

Osti¹,

Rodrigues²,

Carmo³

et al. 2021

Rev. ambiente água

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In this study, the ecotechnology artificial floating islands (AFIs), colonized by Eichhornia crassipes, have been tested as a tool for water quality improvement of fishponds. The experiment was carried out in semi-intensive production during the grow-out period of Nile tilapia, comprising one production cycle. It was completely randomized with two treatments (with and without AFIs) and three replications. Temperature, dissolved oxygen, conductivity, pH, turbidity, total dissolved solids (TDS), transparency (Secchi) and concentrations of chlorophyll a (CL a), total nitrogen (TN), total ammonia nitrogen (TAN), total phosphorus (TP) and orthophosphate (PO43--P) were analyzed fortnightly in the fishponds. Two groups ordered based on environmental characteristics were formed by applying the Principal Component Analysis (70.68% of explicability). The fishponds with AFIs were assigned to higher values of Secchi and lower values of pH, turbidity, TDS and concentrations of nutrients. On the other hand, the fishponds without AFIs were assigned to the highest values of these variables, except for Secchi. In 30 days, the AFIs showed the lowest concentrations of TP and PO43--P, and for CL a, TN and TAN, the differences were recorded after 90 days. The use of AFIs has demonstrated potential to conserve water quality in fishponds, notably for biologically assimilable elements (PO43--P and TAN) and for those directly related to eutrophication (P and N). Artificial floating islands should be encouraged for small and medium-sized farmers as tool to improve water quality in fishponds. However, new AFIs coverage rates must be evaluated, as well as the control of hydraulic retention rates. Keywords: aquaculture, ecotechnology, free-floating aquatic macrophytes.

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Diurnal dynamic of inorganic carbon and oxygen dissolved in a Nile tilapia (Oreochromis niloticus Linnaeus, 1758) fish pond, São Paulo, Brasil

Abstract: Dinâmica diurna das formas de carbono inorgânico e oxigênio dissolvido em viveiro de tilápias do Nilo (Oreochromis niloticus Linnaeus,

Cited by 2 publications

References 12 publications

Daily mass balance of phosphorus and nitrogen in effluents of production sectors of trout farming system

Daily mass balance of phosphorus and nitrogen in effluents of production sectors of trout farming system

Artificial floating islands as a tool for the water quality improvement of fishponds

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