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Fish reproduction

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https://www.readbyqxmd.com/read/28821466/endocrine-disrupting-effects-of-waterborne-fluoxetine-exposure-on-the-reproductive-axis-of-female-goldfish-carassius-auratus
#1
Jan A Mennigen, Jacob M Zamora, John P Chang, Vance L Trudeau
Evidence suggests that pharmaceuticals and personal care products reach urban watersheds, bioconcentrate in fish, and potentially disrupt physiological homeostasis. These impairments often affect hormone functions. Selective serotonin reuptake inhibitors (SRRIs) are increasingly studied with regards to their endocrine disrupting effects on teleost physiological processes, including reproduction. To examine whether FLX effects on the endocrine regulation of reproductive physiology in goldfish are sex-specific, we exposed sexually recrudescent female goldfish to two waterborne concentrations of FLX (0...
August 15, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28808557/timing-and-pattern-of-annual-silver-eel-migration-in-two-european-watersheds-are-determined-by-similar-cues
#2
Odd Terje Sandlund, Ola H Diserud, Russell Poole, Knut Bergesen, Mary Dillane, Gerard Rogan, Caroline Durif, Eva B Thorstad, Leif Asbjørn Vøllestad
Many animals perform long-distance migrations in order to maximize lifetime reproductive success. The European eel migrates several thousand kilometers between their feeding habitats in continental waters (fresh-, brackish, and sea water) and their spawning area in the Sargasso Sea. Eels residing in freshwaters usually initiate their spawning migration as silver eels during autumn, triggered by diverse environmental cues. We analyzed the time series of silver eel downstream migration in Burrishoole, Ireland (1971-2015), and Imsa, Norway (1975-2015), to examine factors regulating the silver eel migration from freshwater to the sea...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28808542/the-relationship-between-male-sexual-signals-cognitive-performance-and-mating-success-in-stickleback-fish
#3
Ross Minter, Jason Keagy, Robin M Tinghitella
Cognitive ability varies dramatically among individuals, yet the manner in which this variation correlates with reproduction has rarely been investigated. Here, we ask (1) do male sexual signals reflect their cognitive ability, and (2) is cognitive ability associated with male mating success? Specifically, we presented threespine sticklebacks (Gasterosteus aculeatus) with a detour-reaching task to assess initial inhibitory control. Fish that performed better were those who solved the detour-reaching task, solved it faster, and required fewer attempts to solve...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28794413/chemical-diplomacy-in-male-tilapia-urinary-signal-increases-sex-hormone-and-decreases-aggression
#4
João L Saraiva, Tina Keller-Costa, Peter C Hubbard, Ana Rato, Adelino V M Canário
Androgens, namely 11-ketotestosterone (11KT), have a central role in male fish reproductive physiology and are thought to be involved in both aggression and social signalling. Aggressive encounters occur frequently in social species, and fights may cause energy depletion, injury and loss of social status. Signalling for social dominance and fighting ability in an agonistic context can minimize these costs. Here, we test the hypothesis of a 'chemical diplomacy' mechanism through urinary signals that avoids aggression and evokes an androgen response in receiver males of Mozambique tilapia (Oreochromis mossambicus)...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28791680/immigrant-reproductive-dysfunction-facilitates-ecological-speciation
#5
Ola Svensson, Johanna Gräns, Malin C Celander, Jonathan Havenhand, Erica H Leder, Kai Lindström, Sofie Schöld, Cock van Oosterhout, Charlotta Kvarnemo
The distributions of species are not only determined by where they can survive - they must also be able to reproduce. Although immigrant inviability is a well-established concept, the fact that immigrants also need to be able to effectively reproduce in foreign environments has not been fully appreciated in the study of adaptive divergence and speciation. Fertilization and reproduction are sensitive life history stages that could be detrimentally affected for immigrants in non-native habitats. We propose that 'immigrant reproductive dysfunction' is a hitherto overlooked aspect of reproductive isolation caused by natural selection on immigrants...
August 9, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28783897/gonadal-intersex-in-smallmouth-bass-micropterus-dolomieu-from-northern-indiana-with-correlations-to-molecular-biomarkers-and-anthropogenic-chemicals
#6
Ahmed Abdel-Moneim, Daragh Deegan, Jiejun Gao, Chloe De Perre, Jarrod S Doucette, Byron Jenkinson, Linda Lee, Maria S Sepúlveda
Over the past decade, studies have shown that exposure to endocrine disrupting chemicals (EDCs) can cause gonadal intersex in fish. Smallmouth bass (Micropterus dolomieu) males appear to be highly susceptible to developing testicular oocytes (TO), the most prevalent form of gonadal intersex, as observed in various areas across the U.S. In this study, prevalence and severity of TO was quantified for smallmouth bass sampled from the St. Joseph River in northern Indiana, intersex biomarkers were developed, and association between TO prevalence and organic contaminants were explored...
July 31, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28783116/teratogenic-effects-of-topiramate-in-a-zebrafish-model
#7
Yu-Heng Lai, Yu-Ju Ding, David Moses, Yau-Hung Chen
Topiramate is commonly used for treating epilepsy in both children and adults. Recent clinical data suggests that administration of topiramate to women during pregnancy increases the risk of oral clefts in their offspring. To better understand the potential effects of topiramate, we dosed adult female zebrafish with topiramate, and investigated the altered morphologies in adult females and their offspring. It showed that topiramate-treated female fish had reduced oocyte maturation, and the survival rates of their offspring were seriously decreased during embryogenesis...
August 7, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28782810/establishment-of-estrogen-receptor-1-esr1-knockout-medaka-esr1-is-dispensable-for-sexual-development-and-reproduction-in-medaka-oryzias-latipes
#8
Saki Tohyama, Yukiko Ogino, Anke Lange, Taijun Myosho, Tohru Kobayashi, Yu Hirano, Gen Yamada, Tomomi Sato, Norihisa Tatarazako, Charles R Tyler, Taisen Iguchi, Shinichi Miyagawa
Estrogens play fundamental roles in regulating reproductive activities and they act through estrogen receptor (ESR) in all vertebrates. Most vertebrates have two ESR subtypes (ESR1 and ESR2), whereas teleost fish have at least three (Esr1, Esr2a and Esr2b). Intricate functionalization has been suggested among the Esr subtypes, but to date, distinct roles of Esr have been characterized in only a limited number of species. Study of loss-of-function in animal models is a powerful tool for application to understanding vertebrate reproductive biology...
August 7, 2017: Development, Growth & Differentiation
https://www.readbyqxmd.com/read/28780570/sex-steroids-differentially-regulate-fshb-lhb-and-gnrhr-expression-in-atlantic-cod-gadus-morhua
#9
Kristine von Krogh, Gunnveig Toft Bjørndal, Rasoul Nourizadeh-Lillabadi, Kjetil Hodne, Erik Ropstad, Trude Marie Haug, Finn-Arne Weltzien
Depending on the stage of gonad maturation, as well as other factors, gonadal steroids can exert either a positive or negative feedback at the brain and pituitary level. While this has been demonstrated in many teleost species, little is known about the nature of steroid feedback in Gadiform fish. Using an optimized in vitro model system of the Atlantic cod pituitary, the present study investigated potential effects of two physiologically relevant doses of estradiol, testosterone or dihydrotestosterone (DHT) on cell viability and gene expression of gonadotropin subunits (fshb/lhb) and two suggested reproduction relevant gonadotropin-releasing hormone receptors (gnrhr1b/gnrhr2a) during three stages of sexual maturity...
August 5, 2017: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/28780444/tissue-specific-distribution-and-maternal-transfer-of-polybrominated-diphenyl-ethers-pbdes-and-their-metabolites-in-adult-common-sole-solea-solea-l-over-an-entire-reproduction-cycle
#10
C Munschy, N Bely, K Héas-Moisan, N Olivier, V Loizeau
Tissue-specific accumulation and distribution of polybrominated diphenyl ethers (PBDEs) and their debrominated metabolites were studied in common sole (Solea solea) over an entire reproduction cycle. The fish were dietary-exposed to selected PBDEs in laboratory-controlled conditions for one year. Fish of both sexes were sampled throughout the reproduction cycle and their muscle, liver, viscera, carcass, skin and gonads (female) were analysed for total lipid content, PBDEs and their debrominated metabolites...
August 3, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28777841/-genetic-analysis-of-three-families-affected-with-split-hand-split-foot-malformation
#11
Wenbin He, Ge Lin, Ping Liang, Dehua Cheng, Xiao Hu, Lihua Zhou, Bo Xiong, Yueqiu Tan, Guangxiu Lu, Wen Li
OBJECTIVE: To explore the genetic etiology of three families affected with split-hand/split-foot malformation (SHFM). METHODS: Peripheral venous blood samples from 21 members of pedigree 1, 2 members of pedigree 2, and 2 members of pedigree 3 were collected. PCR-Sanger sequencing, microarray chip, fluorescence in situ hybridization (FISH), real-time PCR, and next-generation sequencing were employed to screen the mutations in the 3 families. The effect of the identified mutations on the finger (toe) abnormality were also explored...
August 10, 2017: Zhonghua Yi Xue Yi Chuan Xue za Zhi, Zhonghua Yixue Yichuanxue Zazhi, Chinese Journal of Medical Genetics
https://www.readbyqxmd.com/read/28776707/reproductive-biology-of-the-tarpon-snook-centropomus-pectinatus-perciformes-centropomidae-in-estuarine-waters-in-the-south-western-atlantic
#12
M O Freitas, V Abilhoa
The reproductive biology of Centropomus pectinatus is described from an artisanal fish landings collaborative monitoring programme between May 2012 and April 2013 in estuarine waters in north-eastern Brazil. The total length (LT ) at which 50% are mature was 24 cm, corresponding to 37·7% of the maximum recorded LT . Gonado-somatic indices were variable, but highest values were in June and August 2012. Length-frequency distributions showed male dominance in smaller length classes (15-30 cm) and females in larger length classes (>30 cm)...
August 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28772185/vitellogenin-levels-and-others-biomarkers-show-evidences-of-endocrine-disruption-in-fish-species-from-igua%C3%A3-u-river-southern-brazil
#13
F Y Yamamoto, J R E Garcia, A Kupsco, C A Oliveira Ribeiro
The adverse effects of endocrine disrupting chemicals (EDCs) on aquatic wildlife and human health represent a current issue of high public concern. Even so, they are still poorly studied in aquatic environments of South America. The aim of the present study was to investigate the impact of EDCs in five cascading reservoirs from the Iguaçu River, evaluating reproductive endpoints in three native fish species (Astyanax bifasciatus, Chrenicicla iguassuensis and Geophagus brasiliensis). Additionally, a polyclonal antiserum anti-vitellogenin from G...
July 24, 2017: Chemosphere
https://www.readbyqxmd.com/read/28771590/exploring-the-larval-fish-community-of-the-central-red-sea-with-an-integrated-morphological-and-molecular-approach
#14
Stamatina Isari, John K Pearman, Laura Casas, Craig T Michell, Joao Curdia, Michael L Berumen, Xabier Irigoien
An important aspect of population dynamics for coral reef fishes is the input of new individuals from the pelagic larval pool. However, the high biodiversity and the difficulty of identifying larvae of closely related species represent obstacles to more fully understanding these populations. In this study, we combined morphology and genetic barcoding (Cytochrome Oxidase I gene) to characterize the seasonal patterns of the larval fish community at two sites in close proximity to coral reefs in the central-north Red Sea: one shallower inshore location (50 m depth) and a nearby site located in deeper and more offshore waters (~ 500 m depth)...
2017: PloS One
https://www.readbyqxmd.com/read/28770585/life-history-and-initial-assessment-of-fishing-impacts-on-the-by-catch-species-dules-auriga-teleostei-serranidae-in-southern-brazil
#15
A T Rovani, L G Cardoso
The life history of Dules auriga, a small hermaphrodite serranid species inhabiting deep waters and a frequent component of the discarded catch of bottom trawling in southern Brazil, was studied to assess the fishery effects on the stock through the estimation of the remaining spawning-potential ratio. Sampling was conducted throughout a year and included specimens to determine sex, maturity and age. Age was validated by the edge type and marginal-increment analysis. The oldest and the largest individuals were 9 years and 195 mm total length...
August 2, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28768576/the-xenobiotic-sensor-pxr-in-a-marine-flatfish-species-solea-senegalensis-gene-expression-patterns-and-its-regulation-under-different-physiological-conditions
#16
Carlos Marques, Vânia P Roberto, Luís Granadeiro, Marlene Trindade, Paulo J Gavaia, Vincent Laizé, M Leonor Cancela, Ignacio Fernández
The pregnane X receptor (PXR) is a nuclear receptor belonging to the NR1I sub-family and a known master regulator of xenobiotic metabolism. New roles have been recently proposed in mammals through its activation by vitamin K (VK) such as regulation of glucose metabolism, bone homeostasis, reproduction, neuronal development and cognitive capacities. In marine fish species little is known about PXR and its potential roles. Here, expression patterns of pxr transcripts and conservation of protein domains were determined in the Senegalese sole (Solea senegalensis), a marine flatfish model species in aquatic ecotoxicology...
July 23, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28763939/demographic-and-dietary-risk-factors-in-relation-to-urinary-metabolites-of-organophosphate-flame-retardants-in-toddlers
#17
M B Thomas, H M Stapleton, R L Dills, H D Violette, D A Christakis, S Sathyanarayana
Organophosphate flame retardants (OPFRs), including Tris (1,3-dichloro-isopropyl) phosphate (TDCPP), triphenyl phosphate (TPP), and isopropylated triphenyl phosphate (ITP), are increasingly used in consumer products because of the recent phase out of polybrominated diphenyl ether (PBDE) flame retardants. OPFRs have been widely detected in adults and have been linked to reproductive and endocrine changes in adult males. Carcinogenicity and damage to immunologic, neurologic and developmental systems have been observed in human cell lines...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28762516/fluorescence-in-situ-hybridisation-sperm-examination-is-significantly-impaired-in-all-categories-of-male-infertility
#18
S Petousis, Y Prapas, A Papatheodorou, C Margioula-Siarkou, G Papatzikas, Y Panagiotidis, A Karkanaki, K Ravanos, N Prapas
To study the outcome of FISH sperm examination in cases with sperm pathology and outline the potential correlation with certain chromosomal defects. A retrospective study of prospectively collected data was performed in IAKENTRO, Infertility Treatment Center. Rates of abnormal FISH semen examination were compared between male infertility patients and fertile controls. Detection of abnormal FISH semen examination as well as each chromosomal abnormality detected was correlated with each sperm deficiency (asthenozoospermia, oligozoospermia and teratozoospermia) in a univariate regression model...
August 1, 2017: Andrologia
https://www.readbyqxmd.com/read/28762176/a-salty-landscape-of-fear-responses-of-fish-and-zooplankton-to-freshwater-salinization-and-predatory-stress
#19
William D Hintz, Rick A Relyea
Predator-prey relationships are altered by anthropogenic contaminants. Road salt is a widespread contaminant among freshwater ecosystems, yet a relatively understudied subject in community ecology. Unknown is whether road salt salinization interacts with predatory stress to influence the growth, behavior, or reproduction of freshwater organisms. Using rainbow trout (Oncorhynchus mykiss) and zooplankton (Daphnia pulex), we exposed them to variable levels of road salt (NaCl) crossed with the presence or absence of alarm cues or kairomones...
July 31, 2017: Oecologia
https://www.readbyqxmd.com/read/28761092/early-life-history-predator-prey-reversal-in-two-cyprinid-fishes
#20
Marek Šmejkal, Roman Baran, Petr Blabolil, Lukáš Vejřík, Marie Prchalová, Daniel Bartoň, Tomáš Mrkvička, Jan Kubečka
Predator-prey relationships are often perceived simply as a situation in which a predator enhances its own fitness while reducing the fitness of its prey. However, this relationship may become reversed when the prey feeds on the juvenile predator stages. We investigated this phenomenon in a model asp (Leuciscus aspius; predator)-bleak (Alburnus alburnus; prey) relationship. The adhesive asp eggs are available for bleak predation after a spawning event for only tens of seconds before they adhere to the stones, where bleak do not forage...
July 31, 2017: Scientific Reports
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