Impact of fish cage-culture on the community structure of zooplankton in a tropical reservoir

Dias, Juliana Déo; Takahashi, Érica Mayumi; Santana, Natália Fernanda; Bonecker, Cláudia Cósta

doi:10.1590/s0073-47212011000100011

Cited by 25 publications

(27 citation statements)

References 26 publications

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“…Several authors have also verified the negative effect of Cyanobacteria and their toxins on the development and growth of the zooplankton community (Haney, 1987;Lampert, 1987;DeMott, 1999;Ferrão-Filho et al, 2000;Ghadouani et al, 2003;(Dias et al, 2010) in addition to Cryptophyceae, as stated above, whose density decreased during this experimental phase.…”

Section: Discussionsupporting

confidence: 62%

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Effects of fish farming on plankton structure in a Brazilian tropical reservoir

et al. 2010

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This study investigated the effects of fish farming on phytoplankton and zooplankton structure in a Brazilian tropical reservoir. Samplings were undertaken among 15 net cages and upstream and downstream of the cages over a 120-day period. Soon after the tilapia feeding, we observed the highest density of phytoplankton, with dominance of Cyanobacteria which probably increased due to the increase in predation pressure by cladocerans and copepods on the Cryptophyceae. However, after 30 days from that, a reduction in zooplankton density was registered due to the dominance of Cyanobacteria. The absence of a clear spatial difference in the phytoplankton and zooplankton densities was observed. The effects of the net cages on the nutrients and planktonic communities were small, probably due to the low number of net cages and fish employed, the seasons (autumn/ winter) and the hydrodynamics, as lotic traits, the strong influence of the wind, and the large extension of the mixture zone.

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Section: Discussionsupporting

confidence: 62%

“…Furthermore, over time, the constant release of nutrients may exceed the environmental carrying capacity causing eutrophication, which has a considerable impact on planktonic communities (Guo & Li, 2003;Agostinho et al, 2007;Dias et al, 2010;Guo et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Effects of fish farming on plankton structure in a Brazilian tropical reservoir

et al. 2010

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“…Because studies on the effects of fish farming in cages on the population structure of phytoplankton and zooplankton show a change in their structure because some of the parameters such as using food for feeding and farming the fish in the cages, taking antibiotics to control the diseases or increase the immunity of bodies of the fish in the cages, the amount of uneaten food and presence of nutrient substances in food and soluble water and ultimately influencing the water quality especially changing the amount of phosphorous and nitrogen can affect the structure of plankton [25]. Demir et al [26] stated that the density of zooplankton in fish cages off the coast of Turkey increased due to high amounts of ammonium, nitrate and phosphorous but it did not happen on the coats of Brazil [27]. In the present study the population of diatoms compared to other groups of phytoplankton comprised the major part of the density and biomass of microalgae.…”

Section: Discussionmentioning

confidence: 99%

Examining the Effects of Fish Cage Culture on Phytoplankton and Zooplankton Communities in the Southern Coast of the Caspian Sea (Mazandaran Waters– Kelarabad)

Bandpei¹,

Nasrolahzadeh²,

Rahmati³

et al. 2016

AJLSR

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Introduction: This study is in line with the plan to farm trout in cages in the southern areas of the Caspian Sea (Mazandaran waters-Kelarabad) which was carried out in 2012. Methods: Sampling was conducted on a monthly basis and at 3 stations. The goal of this study was to examine the condition of planktonic groups, density, biomass and diversity in the location of fish cages and comparison with the control station. Results:The results showed that the phytoplankton group of 5 phylum and zooplankton of 6 phylum were identified which the population of phytoplankton were only in the spring season the highest and their biomass in station 1 while the population density of zooplankton in most seasons at station 1 had the highest sampling. The density and biomass of phytoplankton and zooplankton in spring and winter were more than other seasons that can be due to the activity of farming rainbow trout in the cages. Over the years, under the dominance of phytoplankton diatoms (84%) and dominant zooplankton population was also Copepods (67%) based on ISI index. Shannon diversity index of phytoplankton varied in the range of 1.25 to 2.73 and for zooplankton in the range of 0.24 to 1.41. There was a significant difference between the intensity and biomass of different seasons (P < 0.05). Conclusions: The conclusion is that the phytoplankton and zooplankton communities at the location of fish cages culture was by far more than the control station which shows the effect of fish cage culture on planktonic organisms and possibly algae blooming in larger size (using several cages and several places for the development of aquaculture) and it irreversible effect on the closed ecosystem of the Caspian Sea in the future.

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“…In Brazil, the use of reservoirs for fish cage farming has significantly grown in recent years (Dias et al 2011) because of the regularization of the multiple use of reservoirs, including aquaculture. This regularization was achieved through the establishment of the National Water Resources Policy in 1997 (Bueno et al 2013), and more specifically by Law No.…”

Section: Introductionmentioning

confidence: 99%

Environmental characterization and impacts of fish farming in the cascade reservoirs of the Paranapanema River, Brazil

Neto¹,

Nocko²,

Ostrensky³

2015

Aquacult. Environ. Interact.

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The goal of this study was to characterize current water quality, simulate water quality in 8 large artificial reservoirs occurring along the course of the Paranapanema River, Brazil, and estimate fish production in the region to assess the impacts of this production on the local aquatic environment. Primary data describing the bottom sediments and water quality, and time series recorded between 2001 and 2011 were used. Water quality was modeled to simulate the trophic state index (TSI) for each reservoir, and 37 fish cage farms along the length of those reservoirs were identified. Only one-third of these farms had environmental licensing for regular operations. The potential increase in fish production was estimated to exceed 250% in the short to medium term. The concentrations of nutrients (organic matter, nitrogen, and phosphorus) present in the bottom sediment beyond areas of fish production were similar to those found in areas distant from the fish farms. The TSI results indicated that the reservoirs could be classified between oligotrophic and mesotrophic. The few eutrophied areas represented approximately 1% on average of the total area of the reservoirs. The reservoirs of the Paranapanema River have adequate water quality standards for aquaculture, and there is no indication that this activity is currently causing significant impacts to the overall aquatic environment in each reservoir. Nevertheless, caution is required when selecting areas for new fish farms to avoid areas that are more susceptible to eutrophication.

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Impact of fish cage-culture on the community structure of zooplankton in a tropical reservoir

Cited by 25 publications

References 26 publications

Effects of fish farming on plankton structure in a Brazilian tropical reservoir

Effects of fish farming on plankton structure in a Brazilian tropical reservoir

Examining the Effects of Fish Cage Culture on Phytoplankton and Zooplankton Communities in the Southern Coast of the Caspian Sea (Mazandaran Waters– Kelarabad)

Environmental characterization and impacts of fish farming in the cascade reservoirs of the Paranapanema River, Brazil

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