Synthetic progestin etonogestrel negatively affects mating behavior and reproduction in Endler's guppies (Poecilia wingei)

Steinbach, Christoph; Císař, Petr; Šauer, Pavel; Klicnarová, Jana; Schmidt‐Posthaus, Heike; Golovko, Oksana; Kroupová, Hana Kocour

doi:10.1016/j.scitotenv.2019.01.276

Cited by 21 publications

(7 citation statements)

References 54 publications

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“…Although, MT dietary administration to adult females stimulates the development of male secondary sexual characteristics, e.g., the growth of sword extension [16,17]; the development of male secondary sexual coloration [18], none have resulted in functional sex reversal. Similarly, eco-toxicological reports on the effects of endocrine disrupting chemicals (EDCs) on adults are also limited to masculinization of secondary sexual characters, e.g., [19].…”

Section: Introductionmentioning

confidence: 99%

Masculinization of Adult Gambusia holbrooki: A Case of Recapitulation of Protogyny in a Gonochorist?

Tran

Kwan

Purser

et al. 2022

Biology

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17α-Methyltestosterone (MT) is a synthetic steroid that has been widely used to masculinize many fish species when administered early during larval development, however, reports on its efficacy on adults is limited. To this end, this study investigated the efficacy of MT in the masculinization of the eastern mosquitofish (G. holbrooki) at two adult stages (maiden and repeat gravid females). The treated females were fed control or respective MT incorporated feed (0–200 mg/kg diet) for 50 days. Effects of the hormone on secondary sexual characteristics, internal gonad morphology, expression of the Anti-Müllerian Hormone (amh) gene and sexual behavior of the treated females were investigated. The results showed that MT at the dose of 50 mg/kg feed stimulated secondary sexual character development, upregulated expression of amh, formation of testicular tissue and a shift in the behavior similar to those of normal males, prominently so in treated maiden gravid females. Post-treatment, long-term observations indicated that only two masculinized females reverted back to being females and gave birth to young. Induction of masculinizing effects in most individuals suggests that the sexual phenotype of this species appears to be highly plastic with potential to sex reverse at adulthood. This in combination with its small size and short reproductive cycle could provide an ideal system to explore the mechanisms of sequential hermaphroditism in fish and contribute to genetic control of this pest fish.

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Section: Introductionmentioning

confidence: 99%

Masculinization of Adult Gambusia holbrooki: A Case of Recapitulation of Protogyny in a Gonochorist?

Tran

Kwan

Purser

et al. 2022

Biology

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“…The relationships between quality traits and morphological traits, gonad development, the gamete maturation cycle, and nutrient requirements are all basic fundamental aspects of artificial breeding and aquaculture of commercial shellfish [23][24][25][26][27][28][29]. In the current study, we clarified the relationships between qualitative traits (BM and STM) and eight phenotypic traits, the characteristics of gonad development and the gamete maturation cycle, and the pleopod nutrient composition of the whelk in both sexes, for the first time.…”

Section: Discussionmentioning

confidence: 87%

Morphological Trait Correlations, Gonadal Development Characteristics and Pleopod Nutrient Compositions of the Whelk Volutharpa perryi perryi

Yu,

Yin,

Han

et al. 2024

Fishes

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The aim of this study was to clarify the “morphological-trait–body weight” correlation, gonadal development characteristics, and pleopod (main edible part) nutrient composition of the whelk (Volutharpa perryi perryi). Live body mass (BM), soft tissue mass (STM), and eight other morphological traits of the whelk were measured, and path coefficients, correlation indices (R2), and coefficients of determination were then calculated. Gonadal development characteristics were investigated by histological observation. Pleopod nutrient composition was analyzed by standard biochemical assays. The results indicated that 1) shell aperture width (SAW) and body whorl height (BWH) were positively correlated with both live BM and STM (p < 0.01), and shell height (SH) was positively correlated with both live BM and STM (p < 0.01) in male whelks; 2) similar gonadal development characteristics were observed in both female and male whelks; and 3) pleopod nutrient composition was consistent in both female and male whelks, whereas sex-specific variation in pleopod nutrient content was observed in the whelks. The observations in this study will provide theoretical support for the development of the whelk aquaculture industry.

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“…Gonopodium-like structures do not lead to complete modification into the male morphology [ 40 , 48 ] and, similar to our observation, reversion may not happen following the removal of the stimulant [ 39 , 44 ]. Fish displaying reproductive reversal (either intersex gonad development or external gonopodium formation) have higher mortality and reduced fecundity [ 39 , 47 , 56 ], and in related Endler’s guppies ( Poecilia wingei ), intersex females are completely sterile [ 64 ]. Therefore, it is likely that the external changes in reproductive morphology associated with the OWTS-effluent-contaminated sites in St. Tammany and Iberia Parish are likely indicators of reduced mosquitofish long-term population viability and stability in these locations.…”

Section: Discussionmentioning

confidence: 99%

Battle of the Bites: The Effect of Sewage Effluent Exposure on Mosquitofish Biocontrol of Mosquitoes in Residential Louisiana

Kane,

Yadav,

Fogle

et al. 2024

Toxics

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Mosquitofish, Gambusia affinis, are eponymous larval mosquito predators. Their ability to colonize and survive in habitats that are uninhabitable by other potential predators allows them to naturally manage larval mosquito populations in most ground pools they are present in. However, effluent from residential onsite wastewater treatment systems (OWTSs) appears to limit the presence of fish predators. This is especially problematic in Louisiana, where regulations allow the discharge of OWTS effluent into open drainage conveyances. To determine the effect of effluent on the capacity of mosquitofish for biocontrol in contaminated areas, we assessed the body condition metrics of populations from two effluent-exposed sites and two sites not exposed to effluent, determined the lethal effect of effluent-contaminated drainage water on fish, and measured the prey consumption rates in the presence of effluent. Female fish collected from effluent-impacted sites had a reduced somatic body condition and most females examined displayed masculinized anal fins resembling the male gonopodium structure. This trait was not seen in fish collected from the control sites and has not yet been documented in association with OWTSs or in the state of Louisiana. Fish from the control sites survived at effluent-contaminated water levels < 70%, and the prey clearance rates increased with dilution. Onsite wastewater treatment system effluent has significant effects on both the short- and long-term persistence of mosquitofish, their body composition, reproductive health, and larval mosquito consumption. These effects likely release mosquito larvae from suppression and may increase the threat of mosquito-transmitted pathogens in effluent-contaminated locations.

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Synthetic progestin etonogestrel negatively affects mating behavior and reproduction in Endler's guppies (Poecilia wingei)

Cited by 21 publications

References 54 publications

Masculinization of Adult Gambusia holbrooki: A Case of Recapitulation of Protogyny in a Gonochorist?

Masculinization of Adult Gambusia holbrooki: A Case of Recapitulation of Protogyny in a Gonochorist?

Morphological Trait Correlations, Gonadal Development Characteristics and Pleopod Nutrient Compositions of the Whelk Volutharpa perryi perryi

Battle of the Bites: The Effect of Sewage Effluent Exposure on Mosquitofish Biocontrol of Mosquitoes in Residential Louisiana

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