Effects of biological traits on capture‐induced parturition in a freshwater stingray and perspectives for species management

Rangel, Bianca de Sousa; Ribeiro, Douglas de Castro; Chagas, Jumma Miranda Araújo; Spada, Lucas; Moreira, Renata Guimarães; Ribeiro, Carla

doi:10.1111/jfb.14412

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…T. dumerilii litter size ranges from two to five pups (Marshall et al, 2007), so the presence of four or more pups indicated that potentially two females gave birth the same night. The identification of the female(s) that gave birth was initially based on visual inspection of females' body appearance because near-term pregnancy is evident from dorsal bulges on the two sides, which disappear immediately after parturition (de Sousa Rangel et al, 2020). To confirm parturition, females suspected to have given birth were dip-netted, drawn to the side of the housing tank, and, while lightly restrained, checked with the ultrasound.…”

Section: Neonates' Morphological Measurementsmentioning

confidence: 99%

“…In teleost fishes, stressors can affect a large variety of reproductive traits, both in parents, including reproductive hormone concentrations, reproductive behavior, vitellogenesis, gamete quality, fecundity, and ovulation timing, and in offspring born from stressed parents, such as behavior, hatching success, size, growth, swimming performance, feeding ability, and survival (Schreck et al, 2001;Milla et al, 2009;Leatherland et al, 2010;Schreck, 2010;Li and Leatherland, 2012;Pankhurst, 2016;Sopinka et al, 2016a). Few data exist for chondrichthyans and almost entirely concern observations of capture-induced premature parturition and abortion (Adams et al, 2018;Wosnick et al, 2019;de Sousa Rangel et al, 2020). Given the low probability of neonates surviving after premature parturition (Charvet-Almeida et al, 2005;Campbell et al, 2018), this is the most severe outcome representing the likely complete failure of the reproductive event.…”

Section: Introductionmentioning

confidence: 99%

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Prolonged Alteration of Neonate Traits Following Maternal Exposure to Fishing-Capture Stress During Late Pregnancy in a Chondrichthyan Species

2021

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For animals discarded after fishing capture (unwanted bycatch), the effects of fishing-capture stress can extend beyond immediate or delayed death, causing long-term, sub-lethal effects such as injuries and physiological, behavioral, immune, energetic, and reproductive consequences. Given the importance of successful reproduction for population recruitment, investigating reproductive impairment is essential, even more so for animals with low reproductive rates such as chondrichthyans. However, data for these species are lacking, even though the poor conservation status of many chondrichthyan populations and the threats from overexploitation and discard require a better understanding of fishing-capture stress consequences. In this study, we investigated the reproductive consequences of trawling and air exposure stress when experienced by southern fiddler rays (Trygonorrhina dumerilii) during late pregnancy, with a focus on neonatal traits. Compared with neonates from unstressed mothers, neonates born from mothers subjected to capture simulation had significantly lower body mass and yolk sac volume at birth, showed a granulocyte-to-lymphocyte ratio indicative of a stressed condition, reduced growth, altered burying behavior, reduced boldness, and swam for shorter distances after a simulated predator attack. Smaller size and lower growth rate might expose neonates to a higher rate of predation, and similarly, the altered burying and swimming behaviors may reduce their ability to escape from predators. Decreased boldness could impact neonate survival by reducing their ability to compete and obtain food and resources. Further investigations are needed, but these initial results suggest that capture stress suffered by pregnant rays may alter traits and survival of their offspring with consequences for recruitment and population abundance.

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Section: Neonates' Morphological Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prolonged Alteration of Neonate Traits Following Maternal Exposure to Fishing-Capture Stress During Late Pregnancy in a Chondrichthyan Species

2021

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“…tribute to two other factors that affect the populations of elasmobranchs, even when the fishes are released into the water: (a) a reduction in the number of spontaneous abortions, which occur due to the capture stress of females in advanced stages of gestation (Adams et al, 2018;Rangel et al, 2020) and (b) a reduction in the number of nest losses with ovigerous capsules, caused by the action of trawls (Cordeiro & Oddone, 2019;Rolim & Avila da Silva, 2016). In both cases, specimens may die or be born outside the parturition areas, decreasing the potential for success of these individuals (Adams et al, 2018).…”

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confidence: 99%

Coastal sharks and rays in a marine protected area in southernBrazil

Santos

Alves²,

Severo

2021

Journal of Fish Biology

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In southern Brazil, we investigated shark and ray capture records in an integral protection marine protection area (MPA) that allows fishing in that area. We found 10 shark and nine ray species, of which 88.5% and 66.2%, respectively, are endangered. Female adults and neonates of both sexes are abundant in the area, with records of stranding of large specimens, postcapture abortions and ovigerous capsules with fresh embryos on the beach. We suggest the application of continuous fisheries monitoring and an increase in guidelines on the capture of endangered species.conservation, elasmobranchs, endangered species, Lagoa do Peixe National Park Coastal regions of southern Brazil are areas with frequent presence of species of sharks, including pregnant females and neonates (de Chelotti & Santos, 2020;Vooren & Klippel, 2005). However, these regions have an intense fishing effort due to recreational fishing from the coast or pier (Motta et al., 2016), artisanal fishing practiced in shallow waters (de Chelotti et al., 2019;Santos et al., 2016) and industrial fishing carried out at greater depths between 50 and 200 m. This makes the coastal region an area with great difficulty in controlling fishing mortality (de Chelotti & Santos, 2020;Vooren & Klippel, 2005).Marine protected areas (MPAs) in the coastal region have an important role, providing a reduction of fishing mortality (Rolim et al., 2019) and, sometimes, overlapping with nursery areas, which are critical for the conservation of these species (Heupel et al., 2019;Vooren & Klippel, 2005). The absence of fishing in MPAs can still con-

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“…Parturition events were disclosed by the presence of neonates in the housing tanks. Identification of individual mothers was made by visual inspection of females' body appearance, because near‐term pregnancy is characterized by an evident bulge of the dorsal side of a female's body, which disappears immediately after parturition (Sousa Rangel et al, 2020). Parturition was then confirmed with ultrasound.…”

Section: Methodsmentioning

confidence: 99%

Influence of female reproductive state and of fishing‐capture stress on the oxygen uptake rate of a viviparous elasmobranch

2023

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In animals discarded after a fishing capture event, the elicited stress response necessary to ensure their survival is energetically costly. This energy is diverted from other important biological activities, including growth and reproduction, possibly impairing them. Given that elasmobranchs are among the most threatened vertebrate groups, estimating capture‐induced energetic changes and comparing these variations to the energy requirements of pregnancy maintenance is necessary. In pregnant southern fiddler rays (Trygonorrhina dumerilii), we measured changes in oxygen uptake rate (ṀO2; a proxy for metabolic rate and energy usage) in response to trawling simulation and air exposure, and estimated the oxygen requirements of sustaining late‐term pregnancy and embryos. ṀO2 was measured in pregnant females, before (prestress ṀO2) and after trawling simulation (after‐capture ṀO2), and again after females gave birth (postpartum ṀO2). After‐capture ṀO2 was 31.7% lower than ṀO2 measured in minimally stressed females, suggesting a reduction in energy expenditure. This reduction is likely triggered by an initially excessive energetic investment in the stress response, and is aimed at shutting down nonessential activities to redirect energy to processes fundamental for survival. Prestress ṀO2 was 78.5% higher than postpartum ṀO2. Capture simulation decreased ṀO2 to values similar to those observed postpartum, suggesting a capture‐induced reduction in oxygen and energy allocation to pregnancy and embryonic respiration, which could be associated with reproductive impairments. These data, by better estimating the impact of capture and discard on energetic requirements and reproductive fitness, may support the introduction of area and/or seasonal closures to fishing.

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Effects of biological traits on capture‐induced parturition in a freshwater stingray and perspectives for species management

Cited by 6 publications

References 19 publications

Prolonged Alteration of Neonate Traits Following Maternal Exposure to Fishing-Capture Stress During Late Pregnancy in a Chondrichthyan Species

Prolonged Alteration of Neonate Traits Following Maternal Exposure to Fishing-Capture Stress During Late Pregnancy in a Chondrichthyan Species

Coastal sharks and rays in a marine protected area in southernBrazil

Influence of female reproductive state and of fishing‐capture stress on the oxygen uptake rate of a viviparous elasmobranch

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