First report on metal and metalloid contamination of Ampullae of Lorenzini in sharks: A case study employing the Brazilian sharpnose shark Rhizoprionodon lalandii from Southeastern Brazil as an ecotoxicological model

Willmer, Isabel Q.; Wosnick, Natascha; Rocha, Rafael Christian Chávez; Saint’Pierre, Tatiana Dillenburg; Vianna, Marcelo; Hauser‐Davis, Rachel Ann

doi:10.1016/j.marpolbul.2022.113671

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…Hepatic damage may also result in decreased environmental contaminant metabolization and subsequent excretion, as the liver is the main detoxifying organ in vertebrates (Yao et al, 2019). This, in turn, leads to higher circulating pollutant levels and significant deleterious physiological effects, including oxidative stress, altered hepatocellular lipid metabolism, citotoxicity and, potentially, genotoxicity which have been reported for many taxonomic groups (Hui et al, 2017;Gabriel et al, 2020;de Farias Araujo et al, 2022), including sharks (Hauser-Davis et al, 2021;Wosnick et al, 2021a), potentially affecting animal health conditions due to altered physiological, systemic and, ultimately, behavioral aspects (Wosnick et al, 2021b;Willmer et al, 2022;Wosnick et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Assessment of the physiological vulnerability of the endemic and critically endangered Daggernose Shark: A comparative approach to other Carcharhiniformes

Wosnick

Chaves²,

Dias

et al. 2023

Front. Mar. Sci.

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IntroductionThe current Isogomphodon oxyrhynchus (Daggernose Shark) population status Q7points to 99% losses in the last decade due to certain biological traits, site fidelity, and historical high representativeness as bycatch in artisanal fisheries. This species is listed as Critically Endangered (CR), both in the IUCN and the Brazilian Red Lists. Its vulnerability is so high that its recovery potential requires protection from ongoing fishing pressure.ObjectiveIn this context, this study aimed to evaluate the health status of Daggernose sharks and their ability to cope with allostatic overload in a comparative analysis with other Carcharhinid and Sphyrnid sharks.MethodsSharks incidentally caught by the artisanal fleet in the state of Maranhão, on the Brazilian Amazon Coast, were sampled for blood, and serum was used to assess biochemical markers.ResultsThe findings indicate significant differences in Daggernose Shark homeostatic capacity for ALP, ALT/GTP, creatinine, lactate, urea, total cholesterol, and triglycerides, pointing to lower health scores and recovery capacity when compared to other Carcharhiniformes inhabiting the same region.Discussion and conclusionsIt is possible that such vulnerability is a result of fisheries-induced evolution, leading to remaining populations with very low chances of fully recovering. Conservation planning is thus urgent, as current legislation based on fishing bans does very little for the species. International collaboration and longterm recovery measures are necessary, including the creation of MPAs specially designed for the species and captive maintenance aiming to monitor health status and carry out breeding attempts.

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Section: Discussionmentioning

confidence: 99%

Assessment of the physiological vulnerability of the endemic and critically endangered Daggernose Shark: A comparative approach to other Carcharhiniformes

Wosnick

Chaves²,

Dias

et al. 2023

Front. Mar. Sci.

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“…Moreover, Guanabara Bay is heavily contaminated by several chemical contaminants due to the inflow of significant amounts of untreated sewage and runoff from landfills, industries, and shipyards [ 4 , 56 ]. In fact, several elasmobranch species captured in or near this area have been reported as containing extremely high levels of both inorganic [ 57 , 58 , 59 , 60 ] and organic contaminants ([ 61 ], Hauser-Davis, pers. Obs.).…”

Section: Discussionmentioning

confidence: 99%

New Occurrences of the Tiger Shark (Galeocerdo cuvier) (Carcharhinidae) off the Coast of Rio de Janeiro, Southeastern Brazil: Seasonality Indications

Aximoff

Cumplido

Rodrigues

et al. 2022

Animals

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The tiger shark Galeocerdo cuvier (Péron & Lesueur, 1822) (Carcharhinidae) is classified as near-threatened along the Brazilian coast, in line with its global categorization. Although Rio de Janeiro, located in southeastern Brazil, is internationally identified as a priority shark conservation area, many shark species, including tiger sharks, are landed by both industrial and artisanal fisheries in this state. However, there is a lack of detailed information on the species capture pressures and records for the state of Rio de Janeiro. Therefore, the aims of this study were to expand the tiger shark record database and to improve upon future conservation and management strategies. Tiger shark records from four coastal Rio de Janeiro regions were obtained by direct observation. The information obtained from fishery colonies/associations, environmental guards, researchers, and scientific articles, totaling 23 records, resulted in an approximately 5-fold increase in the number of tiger shark records off the coast of the state of Rio de Janeiro. A possible seasonality pattern concerning the size of the captured/observed animals was noted, emphasizing the need to consider the coast of Rio de Janeiro as an especially relevant area for at least part of the life history of tiger sharks.

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Unveiling the batoid plight: insights from global stranding data and future directions

Giareta,

Leite,

Hauser-Davis

et al. 2024

Rev Fish Biol Fisheries

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First report on metal and metalloid contamination of Ampullae of Lorenzini in sharks: A case study employing the Brazilian sharpnose shark Rhizoprionodon lalandii from Southeastern Brazil as an ecotoxicological model

Cited by 7 publications

References 35 publications

Assessment of the physiological vulnerability of the endemic and critically endangered Daggernose Shark: A comparative approach to other Carcharhiniformes

Assessment of the physiological vulnerability of the endemic and critically endangered Daggernose Shark: A comparative approach to other Carcharhiniformes

New Occurrences of the Tiger Shark (Galeocerdo cuvier) (Carcharhinidae) off the Coast of Rio de Janeiro, Southeastern Brazil: Seasonality Indications

Unveiling the batoid plight: insights from global stranding data and future directions

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