Near-field loading dynamics of total phosphorus and short-term water quality variations at a rainbow trout cage farm in Lake Huron

2006 ◽  
Vol 8 (9) ◽  
pp. 947 ◽  
Author(s):  
Gregor K. Reid ◽  
Ian McMillan ◽  
Richard D. Moccia
Keyword(s):  
Water Quality ◽  
Rainbow Trout ◽  
Total Phosphorus ◽  
Near Field ◽  
Lake Huron ◽  
Short Term

Short-term effects of a wildfire on the water quality and macroinvertebrate community of a saline stream

2012 ◽  
Vol 21 (5) ◽  
pp. 537 ◽  
Author(s):  
Tracy A. Corbin
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Dissolved Oxygen ◽  
Total Phosphorus ◽  
Macroinvertebrate Community ◽  
Total Kjeldahl Nitrogen ◽  
Short Term ◽  
Reactive Phosphorus ◽  
Kjeldahl Nitrogen ◽  
Fire Conditions

The effects of a wildfire on the water quality and macroinvertebrate community of a saline stream in a semiarid, predominantly cleared catchment were investigated. Samples collected for 12 months following the fire were compared with pre-fire conditions. Small increases in filterable reactive phosphorus, total Kjeldahl nitrogen, total phosphorus, colour and turbidity and decreases in dissolved oxygen were recorded the day after the fire; however, most concentrations returned to pre-fire conditions within 2–3 months. Increases in nutrients were likely due to the deposition of ash, smoke and debris. Total phosphorus and total Kjeldahl nitrogen in the lower part of the catchment remained significantly higher for the year after the fire. No fire-related changes in the macroinvertebrate community structure were apparent. Reduced rainfall following the fire, the predominantly cleared catchment and the presence of a saline-tolerant macroinvertebrate assemblage all contributed to the reduced effects from the fire.

Effects of three pesticides on respiration, coughing, and heart rates of rainbow trout (Salmo gairdneri Richardson)

1976 ◽  
Vol 54 (2) ◽  
pp. 214-219 ◽  
Author(s):  
Carolyn R. Lunn ◽  
Daniel P. Toews ◽  
David J. Pree
Keyword(s):  
Water Quality ◽  
Rainbow Trout ◽  
Fresh Water ◽  
Organochlorine Pesticides ◽  
Water Quality Index ◽  
Quality Index ◽  
Salmo Gairdneri ◽  
Short Term ◽  
Juvenile Rainbow Trout ◽  
Carbamate Insecticide

Short-term, sublethal changes in respiration, heart, and coughing rates in juvenile rainbow trout (1–1.5 years) exposed to the organochlorine pesticides p,p′-DDT (1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane) and HEOD (dieldrin) and the methyl carbamate insecticide carbaryl (1-naphthyl N-methyl carbamate) were monitored at 13 ± 2 °C to investigate the effects of these pesticides on fish in fresh water. Sublethal responses to carbaryl and HEOD on physiological parameters were difficult to measure because dosages required to elicit them resulted in 30% to 60% mortality. DDT in various concentrations gave graded sublethal responses, and it is suggested that the coughing response in particular might be useful as a water-quality index. The DDT threshold for the coughing response was between 52 and 140 parts per billion.

scholarly journals Impact of calculation method, sampling frequency and hysteresis on suspended solids and total phosphorus load estimations in cold climate

2017 ◽  
Vol 48 (6) ◽  
pp. 1594-1610 ◽  
Author(s):  
Pasi Valkama ◽  
Olli Ruth
Keyword(s):  
Water Quality ◽  
Total Phosphorus ◽  
Suspended Solids ◽  
Sampling Frequency ◽  
Cold Climate ◽  
Short Term ◽  
Load Calculation ◽  
Daily Sampling ◽  
Continuous Measuring ◽  
Total Phosphorus Load

Abstract Load calculations of nutrients and suspended solids (SS) transported by rivers are usually based on discrete water samples. Water quality changes in cold climate regions often occur very rapidly and therefore discrete samples are unrepresentative of the range of water quality occurring. This leads to errors of varying magnitude in load calculation. High-resolution turbidity data were used to determine the SS and total phosphorus (TP), and paired with discharge to determine loads from two small catchments in southern Finland. The effect of sampling frequency was investigated by artificially sub-sampling the high frequency concentrations. Regardless of the sampling frequency, the TP load was more likely underestimated while using discrete samples. To achieve ±20% accuracy compared with the reference load, daily sampling should be performed. Hysteresis was detected to have an impact on TP load. Hysteresis analysis also revealed the main source of the TP to be in the fields of the catchment. Continuous measuring proved to be a valuable method for defining loads and short-term fluctuations in water quality in small clayey watercourses in a boreal cold climate, where the climate change will increase the frequency of winter floods.

scholarly journals Effect of red algal bloom on growth and production of carps

Our Nature ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 48-54
Author(s):  
Ram Bhajan Mandal ◽  
Sunila Rai ◽  
Madhav Kumar Shrestha ◽  
Dilip Kumar Jha ◽  
Narayan Prasad Pandit
Keyword(s):  
Water Quality ◽  
Body Weight ◽  
Chlorophyll A ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Algal Bloom ◽  
Total Dissolved Solids ◽  
Dissolved Solids ◽  
Aquaculture Farm ◽  
Red Algal

An experiment was carried to assess the effect of red algal bloom on growth and production of carp, water quality and profit from carp for 120 days at Aquaculture Farm of Agriculture and Forestry University, Chitwan. The experiment included two treatments: carp polyculture in non-red pond and carp polyculture in red pond with algal bloom each with three replicates. Carp fingerlings were stocked at 1 fish/m2 and fed with pellet containing 24% CP at 3% body weight. Net yield of rohu was found significantly higher (p<0.05) in non-red ponds (0.38±0.01 t ha-1) than red ponds (0.24±0.05 t ha-1). Survival of rohu (84.9±1.4%), bighead (95.2±2.0%) and mrigal (88.1±14.4%) were also significantly higher (p<0.05) in non-red ponds than red ponds. Red algal bloom affected DO, nitrate and chlorophyll-a, nitrite, total nitrogen, total phosphorus, total dissolved solids and conductivity. However, overall carp production and profit from carp remained unaffected.

Oil pollution and fisheries

1982 ◽  
Vol 297 (1087) ◽  
pp. 401-411 ◽  
Keyword(s):  
Water Quality ◽  
Adverse Effects ◽  
Oil Pollution ◽  
Coastal Areas ◽  
Short Term ◽  
Fish Stocks ◽  
Local Impacts ◽  
Reduced Water ◽  
Long Term Adverse Effects

The term ‘pollution’ is taken in its broadest sense and effects are recognized to be due to interference, tainting and toxicity. Each of these types of impact is discussed and assessed. It is concluded that no long-term adverse effects on fish stocks can be attributed to oil but that local impacts can be extremely damaging in the short term and that produce from specific localities can be tainted and unmarketable for long periods. In some coastal areas oil can be one among several contributors to reduced water quality, and the implications of this are discussed.

scholarly journals Catchment water quality in the year preceding and immediately following restoration of a drained afforested blanket bog

2021 ◽  
Author(s):  
Paul P. J. Gaffney ◽  
Mark H. Hancock ◽  
Mark A. Taggart ◽  
Roxane Andersen
Keyword(s):  
Water Quality ◽  
Nutrient Release ◽  
Pass Rate ◽  
Future Research ◽  
Negative Effects ◽  
Short Term ◽  
Peatland Restoration ◽  
Blanket Bog ◽  
Quality Threshold ◽  
Policy Incentives

AbstractThe restoration of drained afforested peatlands, through drain blocking and tree removal, is increasing in response to peatland restoration targets and policy incentives. In the short term, these intensive restoration operations may affect receiving watercourses and the biota that depend upon them. This study assessed the immediate effect of ‘forest-to-bog’ restoration by measuring stream and river water quality for a 15 month period pre- and post-restoration, in the Flow Country peatlands of northern Scotland. We found that the chemistry of streams draining restoration areas differed from that of control streams following restoration, with phosphate concentrations significantly higher (1.7–6.2 fold, mean 4.4) in restoration streams compared to the pre-restoration period. This led to a decrease in the pass rate (from 100 to 75%) for the target “good” quality threshold (based on EU Water Framework Directive guidelines) in rivers in this immediate post-restoration period, when compared to unaffected river baseline sites (which fell from 100 to 90% post-restoration). While overall increases in turbidity, dissolved organic carbon, iron, potassium and manganese were not significant post-restoration, they exhibited an exaggerated seasonal cycle, peaking in summer months in restoration streams. We attribute these relatively limited, minor short-term impacts to the fact that relatively small percentages of the catchment area (3–23%), in our study catchments were felled, and that drain blocking and silt traps, put in place as part of restoration management, were likely effective in mitigating negative effects. Looking ahead, we suggest that future research should investigate longer term water quality effects and compare different ways of potentially controlling nutrient release.

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