Fish farming in lakes and acceptable total phosphorus loads: Calibrations, simulations and predictions using the LEEDS model in Lake Southern Bullaren, Sweden

The effluents from fish farming can increase the quantity of suspended solids and promote the enrichment of nitrogen and phosphorus in aquatic ecosystems. In this context, the aim of this work was to evaluate the efficiency of three species of floating aquatic macrophytes (Eichhornia crassipes, Pistia stratiotes and Salvinia molesta) to treat effluents from Nile tilapia culture ponds. The effluent originated from a 1,000-m² pond stocked with 2,000 male Nile tilapia Oreochromis niloticus. The treatment systems consisted of 12 experimental tanks, three tanks for each macrophyte species, and three control tanks (without plants). Water samples were collected from the: (i) fish pond source water, (ii) effluent from fish pond and (iii) effluents from the treatment tanks. The following water variables were evaluated: turbidity, total and dissolved nitrogen, ammoniacal-N, nitrate-N, nitrite-N, total phosphorus and dissolved phosphorus. E. crassipes and P. stratiotes were more efficient in total phosphorus removal (82.0% and 83.3%, respectively) and total nitrogen removal (46.1% and 43.9%, respectively) than the S. molesta (72.1% total phosphorus and 42.7% total nitrogen) and the control (50.3% total phosphorus and 22.8% total nitrogen), indicating that the treated effluents may be reused in the aquaculture activity.

Download Full-text

Spatial characteristics of total phosphorus loads from different sources in the Lancang River Basin

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.137863 ◽

2020 ◽

Vol 722 ◽

pp. 137863 ◽

Cited By ~ 1

Author(s):

Bingyao Zhang ◽

Wei Ding ◽

Bo Xu ◽

Longfan Wang ◽

Yu Li ◽

...

Keyword(s):

River Basin ◽

Total Phosphorus ◽

Spatial Characteristics ◽

Lancang River ◽

Phosphorus Loads ◽

The Lancang River Basin ◽

Different Sources

Download Full-text

Streambank Alluvial Unit Contributions to Suspended Sediment and Total Phosphorus Loads, Walnut Creek, Iowa, USA

Water ◽

10.3390/w10020111 ◽

2018 ◽

Vol 10 (2) ◽

pp. 111 ◽

Cited By ~ 8

Author(s):

William Beck ◽

Thomas Isenhart ◽

Peter Moore ◽

Keith Schilling ◽

Richard Schultz ◽

...

Keyword(s):

Suspended Sediment ◽

Total Phosphorus ◽

Phosphorus Loads

Download Full-text

Phosphorus budget and productivity of an experimental lake during the initial three years of cage aquaculture

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f08-155 ◽

2008 ◽

Vol 65 (11) ◽

pp. 2485-2495 ◽

Cited By ~ 19

Author(s):

Corben E. Bristow ◽

Antoine Morin ◽

Ray H. Hesslein ◽

Cheryl L. Podemski

Keyword(s):

Steady State ◽

Dissolved Oxygen ◽

Total Phosphorus ◽

Fish Farming ◽

Experimental Lakes Area ◽

Phosphorus Budget ◽

Rainbow Trout Oncorhynchus Mykiss ◽

Cage Aquaculture ◽

Aquaculture Waste ◽

Oxygen Concentrations

An experiment was conducted at the Experimental Lakes Area (ELA; Ontario, Canada) to investigate the effect of rainbow trout ( Oncorhynchus mykiss ) cage aquaculture on the phosphorus budget and productivity of a small Precambrian Shield lake during the first three years of fish farming. Annual inputs of phosphorus to the experimental lake from aquaculture waste (67–100 kg) exceeded combined annual inputs from inflows and direct atmospheric deposition (4–18 kg). Compared with a reference lake, hypolimnetic dissolved oxygen concentrations in the aquaculture lake decreased by 36% and hypolimnetic ammonium and total phosphorus increased by 120% and 35%, respectively. However, compared with an epilimnion-fertilized lake, hypolimnetic dissolved oxygen in the aquaculture lake was 255% greater and epilimnetic suspended carbon and chlorophyll a was lower by 64% and 85%, respectively. Epilimnetic suspended carbon and hypolimnetic dissolved oxygen concentrations during aquaculture were more similar to concentrations measured in a hypolimnion-fertilized lake. Although the experimental lake remained oligotrophic during the initial three years of aquaculture, hypolimnetic dissolved oxygen decreased each year and hypolimnetic ammonium and total phosphorus increased each year, which suggests that the lake did not reach a steady state.

Download Full-text