Abstract
The present study was carried out to evaluate the phytoplankton community and water quality in four parallel fishponds (FP1 to FP4) during one year. Some abiotic parameters of water column and phytoplankton was sampled in four sites, one in each fishpond. Similarity analysis showed that FP2 fishpond was markedly different for the others ponds with regard to phytoplankton community. Conductivity, orthophosphate, temperature, TSS and hardness parameters were significantly different (p<0.05) between fishponds and all limnological parameters were significantly different (p<0.01) among period (months). Organic matter and phosphorus of the sediment were significantly different (p<0.01) only among fishponds. In current study Chlorophyceae and Bacillariophyceae occurred in most months. Cyanobacteria density in April and May was higher in all fishponds, at FP3 represented 71.4% in April and FP1 represented 78.7% in May of total reported, with chlorophyll-a content lower than 41 mg.L-1. The physical and chemical parameters of fishponds water constituted relations between the parameters and algae occurrence. The present study however, indicated that Cyanobacteria was more frequent in the fishponds after the fish grow-out period (April), and the water quality should be monitored more frequently in this period, due to the high total phosphorus, orthophosphate and chlorophyll-a contents.
Highlights
Fishponds are dynamic ecosystems characterized by shallowness and continuous water flow, which directly affect both limnological variables throughout the day
An increase of total phosphorus, orthophosphate, and chlorophyll-a was observed among November to April (Figures 2 and 3)
The highest values of chlorophyll-a was recorded among March and April and nitrate was lowest in these months varying between 99 to 250 mg.L–1 (Table 1; Figure 2)
Summary
Fishponds are dynamic ecosystems characterized by shallowness and continuous water flow, which directly affect both limnological variables throughout the day. The water quality is identified in terms of its biotic and abiotic parameters. In open artificial systems, such as fishponds, the physical, chemical and biological variables are highly affected by environmental conditions and management. The physical and chemical parameters are used to evaluate the water quality of fishponds the results are responses to the rational use of water in the fishponds. 166-174 a Biotic and abiotic parameters in parallel fishponds (Sipaúba-Tavares et al, 2010). Ecological water quality is defined by biological parameters because the composition of aquatic communities is reflected by the sum of all influencing or disturbing factors (Kopp et al, 2012)
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