Erratum to “Do sewage treatment plant discharges substantially impair fish reproduction in polluted rivers?” [Sci. Total Environ. 372 (2007) 497–514]

Douxfils, Jessica; Mandiki, Robert; Silvestre, Frédéric; Bertrand, Arnaud; Leroy, Delphine; Thomé, Jean-Pierre; Kestemont, Patrick

doi:10.1016/j.scitotenv.2011.06.027

Cited by 8 publications

(8 citation statements)

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“…Unlike previous studies in which increases in energy storage of exposed fish do not translate to increases in energy allocation corresponding to decreases in reproductive development [4,36,37], the larger exposed fish in the Speed River also tended to have larger relative gonad size. Significant increases in gonad size were also found in MWWE-exposed flounder (Platichthys flesus) [38] and longnose sucker [33].…”

Section: Discussioncontrasting

confidence: 91%

Optimization of effects‐assessment of greenside darter (Etheostoma blennioides) exposed to tertiary treated municipal wastewater based on seasonal changes of reproductive endpoints

Tetreault

Bennett

Servos

et al. 2014

Enviro Toxic and Chemistry

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The present study describes the seasonal changes in reproductive endpoints of the greenside darter (Etheostoma blennioides) and its implications for environmental monitoring. Fish collections conducted at the appropriate time for the site-specific sentinel fish species can provide a wide variety of population-level information including recruitment, reproduction, and energy storage. The objectives of the present study were to: 1) characterize seasonal changes in reproductive endpoints of the greenside darter (both sexes) to determine the appropriate period for monitoring of this sentinel species; and 2) evaluate the effect of exposure of this sentinel species to tertiary treated municipal effluent at the selected monitoring period. Based on the selected parameters (gonadosomatic index [GSI], liver somatic index [LSI], condition factor, and in vitro gonadal steroid production [testosterone (T) in both sexes; estradiol (E2) in females; and 11-ketotestosterone (11KT) in males]), the present study provides evidence for the value of collecting darters during recrudescence (late fall/early winter) to ensure temporal stability, minimum variability, and stable steroid production capacity. Darters exposed to tertiary treated municipal effluent tended to be larger and heavier relative to reference fish but did not demonstrate any consistent responses in terms of condition or relative liver size. No effect on gonadal development was observed, even though these tertiary-effluent-exposed fish demonstrated a significant reduction in the ability to produce hormones. The present study suggests that although fish exposed to tertiary treated effluent demonstrate no population-level effects, they are still responding at a physiological level. Documentation of the reproductive cycle of sentinel species allows for selection of the most appropriate sampling period to reduce variability and greatly enhances the reliability and interpretation of biological responses.

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Section: Discussioncontrasting

confidence: 91%

Optimization of effects‐assessment of greenside darter (Etheostoma blennioides) exposed to tertiary treated municipal wastewater based on seasonal changes of reproductive endpoints

Tetreault

Bennett

Servos

et al. 2014

Enviro Toxic and Chemistry

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“…Testosterone (T), 17β‐estradiol (E2), and 11‐ketotestosterone (11KT) concentrations were assayed in developing eggs, larvae, and juveniles by radioimmunoassay, as described in Douxfils et al (). Radioactive hormones were purchased from Amersham Pharmacia (Buckingamshire, England).…”

Section: Methodsmentioning

confidence: 99%

The sensitive period for male-to-female sex reversal begins at the embryonic stage in the Nile tilapia and is associated with the sexual genotype

et al. 2014

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SUMMARYIn this study, we sought to determine the mechanism of early sex reversal in a teleost by applying 4 hr feminization treatments to XY (17a-ethynylestradiol 2000 mg L À1 ) and YY (6500 mg L À1 ) Nile tilapia embryos on the first day post-fertilization (dpf). We then searched for changes in the expression profiles of some sex-differentiating genes in the brain (cyp19a1b, foxl2, and amh) and in sex steroids (testosterone, 17b-estradiol, and 11-ketotestosterone) concentrations during embryogenesis and gonad differentiation. No sex reversal was observed in YY individuals, whereas sexreversal rates in XY progeny ranged from 0À60%. These results, together with the clearance profile of 17a-ethynylestradiol, confirmed the existence of an early sensitive period for sex determination that encompasses embryonic and larval development and is active prior to any sign of gonad differentiation. Estrogen treatment induced elevated expression of cyp19a1b and higher testosterone and 17b-estradiol concentrations at 4 dpf in both XY and YY individuals. foxl2 and amh were repressed at 4 dpf and their expression levels were not different between treated and control groups at 14 dpf, suggesting that foxl2 did not control cyp19a1b in the brains of tilapia embryos. Increased cyp19a1b expression in treated embryos could reflect early brain sexualization, although this difference alone cannot account for the observed sex reversal as the treatment was ineffective in YY individuals. The differential sensitivity of XY and YY genotypes to embryonic induced-feminization suggests that a sex determinant on the sex chromosomes, such as a Y repressor or an X activator, may influence sex reversal during the first steps of tilapia embryogenesis.

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“…Serum concentrations of testosterone (T), 17β‐estradiol (E2), and 11‐ketotestosterone (11 KT) were assayed by radioimmunoassay after two extractions with cyclohexane‐ethyl acetate (1:1) as described in Douxfils et al. (). All samples and standards were assayed in duplicate.…”

Section: Methodsmentioning

confidence: 99%

Do sex reversal procedures differentially affect agonistic behaviors and sex steroid levels depending on the sexual genotype in Nile tilapia?

et al. 2017

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In Nile tilapia Oreochromis niloticus, phenotypic males and females with different sexual genotypes (XX, XY, YY) have particular behavioral and physiological traits. Compared to natural XX females and XY males, XY and YY females and XX males expressed higher level of aggressiveness that could be related to higher levels of 17β-estradiol and 11-ketotestosterone, respectively. Our results suggest that the presence of a Y chromosome increases aggressiveness in females. However, since the same relationship between aggressiveness and the Y chromosome is not observed in males, we can hypothesize that the differences in aggressiveness are not directly dependent on the genotype but on the sex reversal procedures applied on young fry during their sexual differentiation to produce these breeders. These hormonal treatments could have permanently modified the development of the brain and consequently influenced the behavior of adults independently of their genotype. In both hypotheses (genotype or sex reversal influence), the causes of behavioral modifications have to be searched in an early modification of the brain sexual differentiation.

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Erratum to “Do sewage treatment plant discharges substantially impair fish reproduction in polluted rivers?” [Sci. Total Environ. 372 (2007) 497–514]

Cited by 8 publications

References 0 publications

Optimization of effects‐assessment of greenside darter (Etheostoma blennioides) exposed to tertiary treated municipal wastewater based on seasonal changes of reproductive endpoints

Optimization of effects‐assessment of greenside darter (Etheostoma blennioides) exposed to tertiary treated municipal wastewater based on seasonal changes of reproductive endpoints

The sensitive period for male-to-female sex reversal begins at the embryonic stage in the Nile tilapia and is associated with the sexual genotype

Do sex reversal procedures differentially affect agonistic behaviors and sex steroid levels depending on the sexual genotype in Nile tilapia?

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