Abstract
The study assessed the trophic state of three lakes used as fish farms in the region of Junín-Peru, under different hydrological conditions. Surface water samples were collected from three points at each lake in 2018 during the rainy (March-April) and dry (June-July) seasons. Total phosphorus, turbidity, and chlorophyll-a (Chl-a) were measured. Trophic indexes (TSI Chl-a, and TSI TP) were also computed. The water trophic state categorization was performed by adapting and calculating the Trophic State Index (TSI). The TSI (TP) classified the three lakes in both seasons (rainy and dry) as mesotrophic (30 < TSI ≤ 60). Pomacocha and Tipicocha were classified as eutropic (60 < TSI ≤ 90) in the two seasons according to TSI (Chl a), while Tranca Grande was classified as mesotrophic (also two seasons). The results for TSI showed a predominance of eutrophic and mesotrophic conditions in all lakes used as fish farms.
Highlights
Eutrophication is a complex process in which lakes, rivers and coastal waters receive enormous quantities of nutrients and sediments that may cause accelerated growth of algae and other forms of plant life, which produces a disturbance in the aquatic system (Newman, 2005)
Rainy season lixiviated a lot of minerals from soil, which were discharged in water ecosystems
This study assessed the trophic states of three lakes used as fish farms using the Trophic State Index (TSI)
Summary
Eutrophication is a complex process in which lakes, rivers and coastal waters receive enormous quantities of nutrients (especially phosphorus and nitrogen) and sediments that may cause accelerated growth of algae and other forms of plant life, which produces a disturbance in the aquatic system (Newman, 2005). It is mainly caused by agricultural activities, animal feedlots, sewage water, factories, air pollution and urban areas that release nutrients, which are washed into water ecosystems (Honkanen and Helminen, 2000). Mustapha (2014) reported that eutrophication increased dissolved oxygen depletion, leading to negative impacts on fish growth and production and caused high mortality rates. Smith (2003) examined how eutrophication influences the biomass and species composition of algae in both coastal marine systems and freshwater, concluding that eutrophication causes predictable increases of biomass of algae in lakes, streams, rivers, wetlands, reservoirs, and coastal marine ecosystems
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