Efeito da sazonalidade na reprodução de peixes Characiformes em um rio Neotropical

Portella, Andréia C.; Arsentales, Anderson D.; Cavallari, Daiane Elen; Smith, Welber Senteio

doi:10.1590/1678-4766e2021012

Cited by 3 publications

(3 citation statements)

References 20 publications

(25 reference statements)

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“…Except for the sex ratio, which seems unbalanced and unexpectedly favorable to males, the general pattern observed in this study of the reproductive period and sexual maturity of a naturally isolated population of P. aff. fasciatus from southern Brazil is similar to others small characins (e.g., Hojo et al, 2004;Carvalho et al, 2009;Portella et al, 2021). This species can spawn throughout the year, with peak spawning activity in spring and summer, with an increase in air temperature associated with precipitation, as evidenced by numerous studies (Baroiller et al, 2009;Bartolini et al, 2015;Firkus et al, 2018;Quirino et al, 2021).…”

Section: Discussionsupporting

confidence: 73%

Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil

Kerniske,

Ossa-Guerra,

Dalcin

et al. 2023

Acta Limnol. Bras.

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Aim To investigate reproductive characteristics in a small population of Psalidodon aff. fasciatus living in isolation in an environment with a unique geological configuration, a doline-shaped depression (known as Furna 2), with a mean diameter of 80 m and water depth of 50 m, a natural heritage of the Vila Velha State Park (VVSP). Methods The fish were collected between February 2019 and January 2020 using nets and pots; standard length and total weight were measured. The gonads were also removed for histological analysis. Estimates were made for the weight-length ratio, the relative condition factor, the sex ratio, and the size at first maturity (L50 and L95) for males and females. Results The five gonadal stages that were characterized (resting, early mature, mature, partially empty, and totally empty) were consistent with what was expected for the species. The results obtained here indicate that these lambaris have an opportunistic (r) life strategy. Compared to previous studies, we discovered that fish of this population start maturing at smaller sizes. Indicating negative allometric growth, the length-weight ratio was WT = 0.0002 * LT2.3039, and the condition index (Kn = 0.95) showed no significant gender differences. When compared to other non-isolated populations of the same species, the population's sex ratio showed an unexpectedly significant male predominance (1M: 0.6 F). Conclusions Our results show an imbalance in the sex ratio, contrary to what would be expected for non-isolated populations. This imbalance may be related to the complete isolation of this environment, suggesting that females may be affected by some evolutionary force, such as inbreeding. However, other factors cannot be ruled out, as the underlying genetic mechanisms remain unknown, and only future investigations can reveal a more complete understanding of reproduction in isolated populations.

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Section: Discussionsupporting

confidence: 73%

Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil

Kerniske,

Ossa-Guerra,

Dalcin

et al. 2023

Acta Limnol. Bras.

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“…Adaptive mechanisms, such as the regulation of metabolic rate and the optimization of energy efficiency, become imperative to meet the intensified energy demands associated with migratory efforts and reproductive activities (Ueda & Yamauchi, 1995;Yeşilbaş & Oğuz, 2022). Practical examples of these adaptations abound in Brazilian rivers, where, for instance, the golden dorado can adjust its feeding behavior to ensure the necessary energy reserve for migration (Portella et al, 2021). Simultaneously, piraputanga can synchronize its reproductive cycles with changes in environmental conditions, optimizing the chances of reproductive success (Monteiro et al, 2007).…”

Section: Contextualization Of Piracema and Considerations On Fish Phy...mentioning

confidence: 99%

The impact of climate change on piracema and the sustainability of aquatic resources

Costa,

Oliveira

2024

RSD

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The impact of climate change on piracema and the sustainability of aquatic resources are essential topics in riverine conservation. Piracema refers to the reproductive period of fish, during which they masse migrate to specific locations for spawning. Thus, climatic variations altering environmental conditions directly affect this vital cycle. This study addresses the implications of these changes, emphasizing the vulnerability of the mentioned phenomenon and delineating its repercussions on aquatic biodiversity. Through scientific articles and academic works, it was analyzed that temperature elevation, irregular rainfall patterns, and extreme climatic events can compromise the migration and successful reproduction of fish. Therefore, conservation strategies, including community engagement, infrastructure adaptation, and continuous scientific research, are essential to mitigate these impacts. The sustainability of aquatic resources depends on a delicate balance between preserving piracema and active participation in adaptive management, fostering a healthy coexistence between riverine ecosystems and human communities.

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“…Allometric growth data is an important tool to develop better management protocols for the production of high-quality juveniles, assisting in the management and welfare of production fish (Getso et al, 2017). Given this, it is possible to understand how animal development can be influenced by various environmental factors, sex and gonadal maturity, health status, populations and variations within species (Froese, 2006;Portella et al, 2021). Characiformes fish, for example, are capable to maintain their body size throughout their life cycle, which is why they tend to show isometric growth (Lizama and Ambrósio, 1999;Costa and Nunes, 2019;Urbanski et al, 2023) The allometric growth of fish can be evaluated in different production systems such as nurseries, cages and hapas.…”

Section: Biometric Variablesmentioning

confidence: 99%

Brycon hilarii produced in hapas: effects in allometric growth

Oliveira,

Corrêa-Filho,

Acunha

et al. 2023

Braz. J. Biol.

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Biometric evaluations are essential to determine the growth characteristics related to the weight and length of fish. This study aimed to determine the growth patterns of juvenile piraputangas (Brycon hilarii) produced in hapas within an excavated pond. The piraputangas were anesthetized and micro-chipped and their biometric characteristics were measured. Subsequently, the fish were distributed in six hapas of eight m3 at the density of 20 fish/hapa, totaling 120 animals. During the experimental period six months, the fish were fed twice (5% of the biomass) a day. Every 30 days, all fish were sampled to measure the biometric characteristics of body weight (g); standard length; total length; head height; head length; body height and body width (cm). The calculations of the weight ratio with the biometric characteristics were determined using allometric equation and estimated by linear regression according to the equation log Y = log a + b log X. All tested relationships were significant by the Student t-test (p < 0.05). Allometric growth was positive for: weight x total length; standard weight x length; weight x head height; weight x head length and weight x body height. The relative condition factor of piraputangas observed in this study was 1.00. The study provided information on the allometric parameters of juvenile Brycon hilarii produced in hapas, and the relative condition factor indicated good growth conditions for piraputangas with positive allometric growth.

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Efeito da sazonalidade na reprodução de peixes Characiformes em um rio Neotropical

Cited by 3 publications

References 20 publications

Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil

Reproductive aspects of an isolated population of Psalidodon aff. fasciatus (Teleostei: Characidae) from southern Brazil

The impact of climate change on piracema and the sustainability of aquatic resources

Brycon hilarii produced in hapas: effects in allometric growth

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