Length-weight relationships for seven fish species from Marajó Bay, Amazon estuary, northern Brazil

Loureiro, Sofia; Júnior, Moisés Mourão; Giarrizzo, Tommaso

doi:10.1111/jai.13281

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…In the Pará River Estuary, length-weight relationships of fish species (Loureiro et al, 2017), as well as the reproductive biology of commercial sciaenids are available (Santos et al, 2010;Barbosa et al, 2012). Plagioscion squamosissimus (sciaenidae) reproduces primarily in February/March and August/September (Barbosa et al, 2012), while Plagioscion magdalenae (Sciaenidae) spawns mainly from August to February (Santos et al, 2010).…”

Section: North Brazil Shelfmentioning

confidence: 99%

Systematic Review of Fish Ecology and Anthropogenic Impacts in South American Estuaries: Setting Priorities for Ecosystem Conservation

Barletta

Lima

2019

Front. Mar. Sci.

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Research on estuarine ecology in South America (SA) increased quali-quantitatively since the early 1980 in search of consistent recommendations for estuarine conservation. The most important ecological theory achieved is that the seasonal fluctuation of the salinity gradient creates an ecocline influenced by gradual changes between river-dominated to marine-like waters. Estuarine fish fauna adapts to these changeable abiotic characteristics, including the spatial, and seasonal bioavailability of dissolved oxygen and numerous pollutants. However, studies on the influence of the estuarine ecocline are still missing for key estuarine systems. This study provides an overview of fish ecology and anthropogenic impacts within estuarine systems of SA and discusses priorities for environmental conservation. Research on fish reached important conclusions regarding essential habitats and fish interaction with other biological and abiotic compartments over spatio-temporal settings, including conditions of severe anthropogenic impacts. These impacts are related to unplanned urban settlements, industrial estates, ports, damming of major rivers, dredging activities, and deforestation for extensive farming. Changes in estuarine morphology alter natural flows and lead to habitat losses, disrupting the ecocline and impairing fishes from moving among formerly connected habitats, especially earlier ontogenetic phases. In addition, industrial, urban, and farming activities often result in high loads of metals and persistent organic pollutants, organic enrichment and oxygen depletion. Moreover, plastic debris, a ubiquitous contaminant with sources on every human activity, including fishing, when fragmented into microplastics, become preferably concentrated in semi-enclosed environments, as estuaries. Metals, POPs and microplastics are actually asserted to be persistent. When in high concentrations, they become bioavailable to the estuarine trophic web through bioaccumulation, being biomagnified or biotransfered toward higher trophic level organisms, such as top predator fishes. Therefore, research on environmental quality and fish ecology must be based on robust sampling designs along the whole ecocline using long-term approaches. In addition, basic sanitation, co-management, an improved Barletta and Lima Ecology and Conservation of South American Estuaries licensing system and scientifically-based risk assessments/monitoring for all sorts of enterprise are also urgent. These conservation priorities need to be in place before human-driven changes surpass the ecosystem's capacity to produce resources and maintain services.

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Section: North Brazil Shelfmentioning

confidence: 99%

Systematic Review of Fish Ecology and Anthropogenic Impacts in South American Estuaries: Setting Priorities for Ecosystem Conservation

Barletta

Lima

2019

Front. Mar. Sci.

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“…Knowledge of the richness of marine and freshwater fish fauna in the State of Amapá is still poor and few studies have generated length-weight relationship parameters (LWR) (Silva, Oliveira, Florentino, & Tavares Dias, 2015;Oliveira, Silva, Prestes, & Tavares Dias, 2018) which are essential for the management of fish stocks, knowledge of the ecological behavior of fish species, biomass estimates, and determine fish welfare using the allometric condition factor (Vazzoler, 1996;Froese, 2006;Giarrizzo, Bastos, & Andrade, 2011;Soares, Santos, Mendes, Barthem, & Montag, 2015;Loureiro, Mourão Júnior, & Giarrizzo, 2017;Oliveira et al, 2018). Among such studies only one deeper investigation was conducted, as it evaluated the Maximum Sustainable Yield (MRS) of fishery resources in the Araguari River, and observed that the effort and yield of Characiformes and Siluriformes -target fisheries are above what the environment supports, characterizing it as an overexploited resource (see Oliveira et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Length-weight relationship and condition factor of eight fish species from the upper Araguari River, State of Amapá, Brazil

Prestes¹,

Oliveira²,

Tavares‐Dias³

et al. 2019

Acta Sci. Biol. Sci.

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The present study estimated parameters of the length-weight relationship (LWR) and allometric condition factor for eight fish species from the upper Araguari River, in the State of Amapá, Brazil. A total of 615 fish of eight species were analyzed: Acestrorhynchus falcatus, A. falcirostris, Ageneiosus inermis, Hemiodus unimaculatus, Hoplias aimara, Myloplus asterias, M. ternetzi and Tometes trilobatus. The allometric condition factor varied from 0.742 to 1.435. The coefficient of allometry ranged from 2.723 to 3.225. The coefficient of determination (R2) of the LWR ranged from 0.742 to 0.985. This is the first estimate of the length-weight relationship for fish from the Araguari River and the first record of these parameters for Myloplus ternetzi and Tometes trilobatus.

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Length-weight relationships for seven fish species from Marajó Bay, Amazon estuary, northern Brazil

Cited by 2 publications

References 15 publications

Systematic Review of Fish Ecology and Anthropogenic Impacts in South American Estuaries: Setting Priorities for Ecosystem Conservation

Systematic Review of Fish Ecology and Anthropogenic Impacts in South American Estuaries: Setting Priorities for Ecosystem Conservation

Length-weight relationship and condition factor of eight fish species from the upper Araguari River, State of Amapá, Brazil

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