Interference of cage fish farm on diet, condition factor and numeric abundance on wild fish in a Neotropical reservoir

Ramos, Igor Paiva; Brandão, Heleno; Zanatta, Augusto Seawright; Zica, Érica de Oliveira Penha; Silva, Reinaldo José da; Rezende-Ayroza, Daercy M.M. de; Carvalho, Edmir Daniel

doi:10.1016/j.aquaculture.2013.07.013

Cited by 32 publications

(38 citation statements)

References 24 publications

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“…; Ramos et al . ), (ii) changes in zooplankton composition (Zanatta et al . ) and (iii) accumulation of toxins in the meat (Deblois et al .…”

Section: Discussionmentioning

confidence: 99%

“…In addition to the direct impacts, the expansion of aquaculture may further enhance a myriad of indirect effects. Studies have demonstrated that the farming system using cage nets is associated with a series of changes in the native fauna, including (i) changes in diet of native fish (Dem etrio et al 2012;Ramos et al 2013), (ii) changes in zooplankton composition (Zanatta et al 2010) and (iii) accumulation of toxins in the meat (Deblois et al 2008). The lack of a clear rule guiding the transit of cage nets and other related structures between the different APs may intensify the process of secondary introductions, such as those of mollusks and macrophytes responsible for serious ecological impacts such as Limnoperna fortunei and Hydrilla verticillata (Darrigran & Damborenea 2011; Thomaz et al 2015).…”

Section: Negative Ecological Impactsmentioning

confidence: 99%

“…; Ramos et al . ), which ultimately disturbs the structure and dynamics of natural food webs and facilitates the exchange of parasites between farmed and native fauna (Orsi & Agostinho ; Johnson et al . ; Peeler & Feist ); (iii) cage nets can alter the quality of the local habitat, for instance by promoting eutrophication (Figueredo & Giani ).…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the farming of non-native species in aquaculture systems based on cage nets (the main farming modality used in APs) will most likely increment their chances of establishment and impact. As the cage nets are located directly inside natural water bodies, serious consequences may arise, including: (i) escapes are inevitable in such farming systems, thus creating a continuous source of non-native propagules into the environment (Azevedo-Santos et al 2011), which is worrisome as propagule pressure is widely recognized as the main factor responsible for the establishment of non-native species (Johnston et al 2009;Simberloff 2009;Britton & Gozlan 2013); (ii) cage nets attract the native fauna, leading to changes in their diet patterns (Dem etrio et al 2012;Ramos et al 2013), which ultimately disturbs the structure and dynamics of natural food webs and facilitates the exchange of parasites between farmed and native fauna (Orsi & Agostinho 1999;Johnson et al 2004;Peeler & Feist 2011);(iii) cage nets can alter the quality of the local habitat, for instance by promoting eutrophication (Figueredo & Giani 2005). As demonstrated by other studies, changes in the local habitat affect negatively native species resulting in local extirpations and increasing invasion success of nonnative species (Baltz & Moyle 1993;Moyle & Light 1996;Marchetti et al 2004;Sk ora et al 2015).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Expansion of aquaculture parks and the increasing risk of non‐native species invasions in Brazil

Lima

Oliveira

Giacomini

et al. 2016

Reviews in Aquaculture

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Aquaculture is the main vector for introduction of non‐native species in Brazil and around the world. Despite the potentially serious and irreversible ecological impacts caused by non‐native species, they continue to be in many cases the preferred option in aquaculture farms, of which the recent plans of aquaculture expansion promoted by the Brazilian Government are an emblematic example. In this study, we present a survey of publicly available information on aquaculture parks to be installed across the Brazilian territory, with emphasis on species status as native or non‐native, and discuss the implications for the conservation of aquatic biodiversity. One hundred and thirty‐nine aquaculture parks (APs), with a total of 1556 sites covering 941.38 hectares, have been called for bids. Among these, 122 APs will contain at least one non‐native species, and 68 APs will be based exclusively on their cultivation. A predictable consequence is the enhancement of propagule pressure in surrounding aquatic ecosystems, increasing the risk of non‐native species establishment or persistence, which will likely intensify the environmental impacts already in course in four major river basins and along the Brazilian coast. These impacts will add up to more direct effects of aquaculture farming – for example elevated input of nutrients and organic matter – and include changes in habitat and water quality, spread of diseases, biotic homogenization, loss of population viability resulting from hybridization and outbreeding depression, and the local extirpation of native species.

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“…; Ramos et al . ), (ii) changes in zooplankton composition (Zanatta et al . ) and (iii) accumulation of toxins in the meat (Deblois et al .…”

Section: Discussionmentioning

confidence: 99%

Section: Negative Ecological Impactsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Expansion of aquaculture parks and the increasing risk of non‐native species invasions in Brazil

Lima

Oliveira

Giacomini

et al. 2016

Reviews in Aquaculture

View full text Add to dashboard Cite

show abstract

“…However, this activity can have a significant impact on aquatic environments (Garcia et al 2014, Li et al 2014, and minimizing these risks requires planning, legislating compliance, and managing and monitoring the environmental quality of the fish farms (Nyanti et al 2012, Ling et al 2013, Ramos et al 2013.…”

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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Dazed and confused: Behavioural constraints impose major challenges to fish passage in the neotropics

Lopes

Alves²,

Peressin

2021

Aquatic Conservation

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1. The role of fish translocation upstream of dams, for the conservation of migratory species, is controversial. An important but still unaddressed question is whether migratory patterns are affected, after the translocation events, by a hydropower dam. In existing dams, a useful means to test this might be to compare the behaviour of translocated fish with those in undammed river segments in the same region.2. The objective of this study was to evaluate the effectiveness of fish translocation in promoting access to spawning areas through a behavioural approach using Prochilodus costatus as a study model in the São Francisco River, south-east Brazil.3. The reservoir acted as a barrier to the dispersal of translocated individuals with only a small fraction of the population able to locate lotic stretches in the tributaries. Individuals translocated to undammed stretches of river upstream of the reservoir exhibited movement behaviour that was markedly different from that of individuals native to this region. Translocated individuals mainly displayed an erratic pattern of movement between upstream and downstream stretches of river with no specific route. In contrast, local individuals made long-distance upstream spawning migrations and downstream return migrations to feeding sites during specific periods of the year. The results indicate that translocating individuals upstream of Três Marias damtends to be ineffective for the conservation of P. costatus in the region. The study showed that the behaviour of translocated individuals, a largely neglected factor for the tropical region, may be an additional barrier to the success of conservation programmes based on fish passage systems. For the population studied, the maintenance of a free-flowing stretch where fish are able to complete their life cycle is a more viable and effective alternative for conservation.

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Interference of cage fish farm on diet, condition factor and numeric abundance on wild fish in a Neotropical reservoir

Cited by 32 publications

References 24 publications

Expansion of aquaculture parks and the increasing risk of non‐native species invasions in Brazil

Expansion of aquaculture parks and the increasing risk of non‐native species invasions in Brazil

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

Dazed and confused: Behavioural constraints impose major challenges to fish passage in the neotropics

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