Reproduction of the threatened Annual Killifish Austrolebias nigrofasciatus (Cyprinodontiformes: Rivulidae), confined in a natural environment

Volcan, Matheus Vieira; Fonseca, Alinca Peres da; Robaldo, Ricardo Berteaux

doi:10.11609/jott.o2575.1864-7

Cited by 17 publications

(19 citation statements)

References 15 publications

(8 reference statements)

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“…(Vaz‐Ferreira et al, ; Tanizaki, ). From the fourth week after hatching until the natural death of the adult fish caused by the drought period (27 weeks after hatching), M. robustus continuously produced embryos ― as reported in southern annual killifishes Austrolebias charrua (Arezo et al, ), A. nigrofasciatus (Volcan et al, ), A. vandenbergi , and Neofundulus ornatipinnis (Schalk et al, ) ― that, through a complex dynamic of development, are able to hatch, after waiting during the drought and humid periods, in the next rainy season, thus completing the annual life cycle and reestablishing the population.…”

Section: Introductionmentioning

confidence: 76%

Developmental ecology of annual killifish Millerichthys robustus (Cyprinodontiformes: Cynolebiidae)

Domínguez-Castanedo

Valdesalici

Rosales‐Torres

2017

Developmental Dynamics

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Populations of annual killifishes persist in temporary water bodies over the dry season through the expression of diapause in their drought-resistant embryos. Environmental cues may influence expression of the diapause phenotype during embryonic incubation. Millerichthys robustus is the only annual killifish distributed in North America. The aim of this review is to analyze the ecology of M. robustus development and contrast this with that of annual killifishes in austral locations. The temporary water bodies inhabited by M. robustus present the following environmental conditions: flood, drought, and humidity. During the flooding period, the environment presents the lowest temperatures, shortest photoperiod, and highest precipitation, and embryos were found in diapause I. The drought period features the highest temperatures and lowest precipitation, and embryos were found in diapause II. In contrast, during the humid period at the beginning of the rainy season, embryos were found in diapause I, II, and III, associated with the longer photoperiod and high temperatures. These dynamics of the diapause phenotypes can be explained by a combination of the strategies of phenotypic plasticity during flood and drought periods, and bet-hedging during the humid period. Moreover, the microenvironmental conditions in which embryos were buried could influence developmental trajectories. Developmental Dynamics 246:802-806, 2017. © 2017 Wiley Periodicals, Inc.

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Section: Introductionmentioning

confidence: 76%

Developmental ecology of annual killifish Millerichthys robustus (Cyprinodontiformes: Cynolebiidae)

Domínguez-Castanedo

Valdesalici

Rosales‐Torres

2017

Developmental Dynamics

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“…Annual fishes in general are exposed to marked fluctuations in abiotic conditions in their natural habitat (Errea & Danulat 2001, Arenzon et al 2002b, Volcan et al 2011c). Frenkel & Goren (2000) studying the effect of temperature on the growth of killifish, between 18 and 27 °C, showed higher growth of Aphanius dispar at 18 and 23 °C.…”

Section: Figura 2 Crescimento De Machos (A) E Fêmeas (B) Dementioning

confidence: 99%

Effect of temperature on growth of the threatened annual fish Austrolebias nigrofasciatus Costa & Cheffe 2001

et al. 2012

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This study evaluated the effect of temperature on growth of Austrolebias nigrofasciatus, an endemic and threatened annual killifish species of the Patos-Mirim lagoon system in Southern Brazil. In order to verify the effect of temperature on initial growth of A. nigrofasciatus, eggs stored in the laboratory were hatched and juveniles reared for eight weeks at 16 and 22 ºC. The standard length of newly hatched fishes was 4.67 ± 0.25 mm and after eight weeks they reached 23.68 ± 3.73 and 22.68 ± 5.36 mm, respectively at 16 and 22 ºC. However, initial growth of fish reared at 22 ºC was faster and they reached sexual dimorphism at an earlier age compared to those reared at 16 ºC. Final length of females reared at 22 ºC was 23.00 ± 2.83 mm, they were significantly larger than those reared at 16 ºC (17.91 ± 2.47 mm). Males were significantly larger than the females at 16 ºC, but there was no difference for growth between sexes of fish reared at 22 ºC. The sex ratios were 1:0.6 and 1:1.1 (M:F) at 16 ºC and 22 ºC, respectively, suggesting temperature determination of phenotypic sex. Considering the results, it appears that juveniles to be developed in captivity should be kept at 22 ºC during the first six weeks of life, thus ensuring a higher growth rate until puberty.

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“…This area is additionally the type‐locality of A. nigrofasciatus (Costa and Cheffe, ) and where the biggest populations of both Austrolebias species in Brazil (Reis et al., ; Volcan et al., ) are recorded, further demonstrating the importance of these wetlands for conservation. Little is known about the bioecological and population aspects of these species that is necessary to support conservation efforts (Fonseca, ; Gonçalves et al., ; Volcan et al., , ). The aim of this work was to present LWRs for populations of the annual fishes Austrolebias nigrofasciatus , A. wolterstorffi and Cynopoecilus melanotaenia living in the temporary freshwater wetlands of southern Brazil.…”

Section: Introductionmentioning

confidence: 99%

Length-weight relationship of three annual fishes (Rivulidae) from temporary freshwater wetlands of southern Brazil

2013

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Summary The present study describes length‐weight relationships (LWRs) of three species of the family Rivulidae, Austrolebias nigrofasciatus, Austrolebias wolterstorffi and Cynopoecilus melanotaenia, captured in temporary freshwater wetlands of southern Rio Grande do Sul, Brazil from May to December 2011. The growth pattern for both species was predicted using a linear regression of LWR. Estimates of parameter b ranged from 2.81 in male C. melanotaenia to 3.34 for females A. nigrofasciatus. The present observations are significant for conservation and management because these species are threatened and their habitats are under pressure.

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Reproduction of the threatened Annual Killifish Austrolebias nigrofasciatus (Cyprinodontiformes: Rivulidae), confined in a natural environment

Cited by 17 publications

References 15 publications

Developmental ecology of annual killifish Millerichthys robustus (Cyprinodontiformes: Cynolebiidae)

Developmental ecology of annual killifish Millerichthys robustus (Cyprinodontiformes: Cynolebiidae)

Effect of temperature on growth of the threatened annual fish Austrolebias nigrofasciatus Costa & Cheffe 2001

Length-weight relationship of three annual fishes (Rivulidae) from temporary freshwater wetlands of southern Brazil

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