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Fish reproduction

Juliana M B Ricci, Emanuel R M Martinez, Arno J Butzge, Lucas B Doretto, Marcos A Oliveira, Robie Allan Bombardelli, Jan Bogerd, Rafael H Nóbrega
We have characterized the full-length vasa cDNA from Jundiá, Rhamdia quelen (Heptapteridae, Siluriformes). vasa encodes a member of the DEAD-box protein family of ATP-dependent RNA helicases. This protein is highly conserved among different organisms and its role is associated with RNA metabolism. In the majority of the investigated species, vasa is restricted to the germ cell lineage and its expression has been used to study germline development in many organisms, including fish. The deduced R. quelen vasa amino acid sequence displayed high similarity with Vasa protein sequences from other organisms, and did not cluster with PL10 or P68 DEAD-box protein subfamilies...
February 14, 2018: Gene
Selma Hurem, Tânia Gomes, Dag A Brede, Ian Mayer, Viola H Lobert, Stephen Mutoloki, Kristine B Gutzkow, Hans-Christian Teien, Deborah Oughton, Peter Aleström, Jan L Lyche
The biological effects of gamma radiation may exert damage beyond that of the individual through its deleterious effects on reproductive function. Impaired reproductive performance can result in reduced population size over consecutive generations. In a continued effort to investigate reproductive and heritable effects of ionizing radiation, we recently demonstrated adverse effects and genomic instability in progeny of parents exposed to gamma radiation. In the present study, genotoxicity and effects on the reproduction following subchronic exposure during a gametogenesis cycle to 60 Co gamma radiation (27 days, 8...
February 13, 2018: Ecotoxicology and Environmental Safety
Jan Werner, Nikolaos Sfakianakis, Alan D Rendall, Eva Maria Griebeler
Ectothermic and endothermic vertebrates differ not only in their source of body temperature (environment vs. metabolism), but also in growth patterns, in timing of sexual maturation within life, and energy intake functions. Here, we present a mathematical model applicable to ectothermic and endothermic vertebrates. It is designed to test whether differences in the timing of sexual maturation within an animal's life (age at which sexual maturity is reached vs. longevity) together with its ontogenetic gain in body mass (growth curve) can predict the energy intake throughout the animal's life (food intake curve) and can explain differences in energy partitioning (between growth, reproduction, heat production and maintenance, with the latter subsuming any other additional task requiring energy) between ectothermic and endothermic vertebrates...
February 13, 2018: Journal of Theoretical Biology
Matthew W Pennell, Judith E Mank, Catherine L Peichel
Despite the prevalence of sexual reproduction across eukaryotes, there is a remarkable diversity of sex determination mechanisms. The underlying causes of this diversity remain unclear, and it is unknown if there are convergent trends in the directionality of turnover in sex determination mechanisms. We used the recently assembled Tree of Sex database to assess patterns in the evolution of sex determination systems in the remarkably diverse vertebrate clades of teleost fish, squamate reptiles, and amphibians...
February 16, 2018: Molecular Ecology
Jeffrey C Wolf, James R Wheeler
Although frequently examined as a target organ for non-endocrine toxicity, histopathological evaluation of the liver is becoming a routine component of endocrine disruption studies that utilize various fish species as test subjects. However, the interpretation of microscopic liver findings can be challenging, especially when attempting to distinguish adverse changes associated with endocrine disrupting substances from those caused by systemic or direct hepatic toxicity. The purpose of this project was to conduct a critical assessment of the available peer-reviewed and grey literature concerning the histopathologic effects of reproductive endocrine active substances (EAS) and non-endocrine acting substances in the livers of fish models, and to determine if liver histopathology can be used to reliably distinguish endocrine from non-endocrine etiologies...
February 12, 2018: Aquatic Toxicology
Irfan Ahmad Bhat, Mir Ishfaq Nazir, Irshad Ahmad, Gireesh-Babu Pathakota, T I Chanu, Mukunda Goswami, J K Sundaray, Rupam Sharma
Chitosan nanoparticles (CNPs) have been proven considerable delivery agents due to their remarkable physicochemical properties. Present study reports the fabrication of CNPs by ionic gelation process and their characterization by different approaches. The constructed nanoparticles were successfully conjugated with eurycomanone with significant entrapment efficiency. Particle size of chitosan and chitosan conjugated eurycomanone nanoparticles were 126.2 nm and 130 nm respectively. Scanning electron microscopy showed that the particles were spherical in shape and well dispersed...
February 12, 2018: International Journal of Biological Macromolecules
Radka Symonová, W Mike Howell
To understand the cytogenomic evolution of vertebrates, we must first unravel the complex genomes of fishes, which were the first vertebrates to evolve and were ancestors to all other vertebrates. We must not forget the immense time span during which the fish genomes had to evolve. Fish cytogenomics is endowed with unique features which offer irreplaceable insights into the evolution of the vertebrate genome. Due to the general DNA base compositional homogeneity of fish genomes, fish cytogenomics is largely based on mapping DNA repeats that still represent serious obstacles in genome sequencing and assembling, even in model species...
February 14, 2018: Genes
Isabel S Keller, Till Bayer, Walter Salzburger, Olivia Roth
Sexual dimorphism is founded upon a resource allocation trade-off between investments in reproduction versus other life-history traits including the immune system. In species with conventional parental care roles, theory predicts that males maximize their lifetime reproductive success by allocating resources towards sexual selection, while females achieve this through prolonging their lifespan. Here, we examine the interrelation between sexual dimorphism and parental care strategies in closely related maternal and biparental mouthbrooding cichlid fishes from East African Lake Tanganyika...
February 14, 2018: Evolution; International Journal of Organic Evolution
Citlalli Osorio-Yáñez, Bizu Gelaye, Daniel A Enquobahrie, Chunfang Qiu, Michelle A Williams
Pregnancy is a period when the mother and her offspring are susceptible to the toxic effects of metals. We investigated associations of intake of frequently consumed foods with urinary metals concentrations among pregnant women in the Pacific Northwest. We measured urinary cadmium (U-Cd), arsenic (U-As) and molybdenum (U-Mo) concentrations from spot urine samples in early pregnancy (15 weeks of gestation, on average) among 558 women from Seattle and Tacoma, Washington. We assessed periconceptional dietary intake using a semi-quantitative food frequency questionnaire (FFQ)...
February 10, 2018: Environmental Pollution
Jill A Jenkins, Michael R Rosen, Rassa O Draugelis-Dale, Kathy R Echols, Leticia Torres, Carla M Wieser, Constance A Kersten, Steven L Goodbred
Lake Mead National Recreational Area (LMNRA) serves as critical habitat for several federally listed species and supplies water for municipal, domestic, and agricultural use in the Southwestern U.S. Contaminant sources and concentrations vary among the sub-basins within LMNRA. To investigate whether exposure to environmental contaminants is associated with alterations in male common carp (Cyprinus carpio) gamete quality and endocrine- and reproductive parameters, data were collected among sub-basins over 7 years (1999-2006)...
February 10, 2018: Environmental Research
Daniane C Zago, Alessandro C Santos, Carlos F C Lanes, Daniela V Almeida, Gessi Koakoski, Murilo S de Abreu, Carla C Zeppenfeld, Berta M Heinzmann, Luis F Marins, Bernardo Baldisserotto, Leonardo J G Barcellos, Mauro A Cunha
Dietary supplements are commonly used by animals and humans and play key roles in diverse systems, such as the immune and reproductive systems, and in metabolism. Essential oils (EOs), which are natural substances, have potential for use in food supplementation; however, their effects on organisms remain to be elucidated. Here, we examine the effects of dietary Aloysia triphylla EO supplementation on zebrafish behavior, metabolism, stress response, and growth performance. We show that fish fed diets containing A...
February 8, 2018: Fish Physiology and Biochemistry
JoLynn Carroll, Frode Vikebø, Daniel Howell, Ole Jacob Broch, Raymond Nepstad, Starrlight Augustine, Geir Morten Skeie, Radovan Bast, Jonas Juselius
We simulate oil spills of 1500 and 4500m3/day lasting 14, 45, and 90days in the spawning grounds of the commercial fish species, Northeast Arctic cod. Modeling the life history of individual fish eggs and larvae, we predict deviations from the historical pattern of recruitment to the adult population due to toxic oil exposures. Reductions in survival for pelagic stages of cod were 0-10%, up to a maximum of 43%. These reductions resulted in a decrease in adult cod biomass of <3% for most scenarios, up to a maximum of 12%...
January 2018: Marine Pollution Bulletin
Gajenathirin Sinnathamby, Gemma Henderson, Saleh Umair, Peter Janssen, Ross Bland, Heather Simpson
Culture-independent methods were used to study the microbiota of adult worms, third-stage larvae and eggs, both in faeces and laid in vitro, of Haemonchus contortus, a nematode parasite of the abomasa of ruminants which is a major cause of production losses and ill-health. Bacteria were identified in eggs, the female reproductive tract and the gut of adult and third-stage larvae (L3). PCR amplification of 16S rRNA sequences, denaturing gradient gel electrophoresis (DGGE) and clone libraries were used to compare the composition of the microbial communities of the different life-cycle stages of the parasites, as well as parasites and their natural environments...
2018: PloS One
A Khendek, A Chakraborty, J Roche, Y Ledoré, A Personne, T Policar, D Żarski, R Mandiki, P Kestemont, S Milla, P Fontaine
Pikeperch (Sander lucioperca) is a highly valuable fish in Europe. However, development of aquaculture of pikeperch is highly limited due to seasonality of production. This can be overcome by the controlled reproduction of domesticated fish. The first steps of domestication process may induce changes at anatomical, physiological and molecular levels, thereby affecting a variety of biological functions. While there is abundant literature on their effects on stress and growth for example, these effects on reproduction received limited attention notably in pikeperch, a promising candidate for the development of aquaculture...
February 8, 2018: Animal: An International Journal of Animal Bioscience
Ahmad Negintaji, Alireza Safahieh, Hossein Zolgharnein, Soheila Matroodi
Bisphenol A (BPA) is a known environmental endocrine-disrupting chemical that is widely used in plastics manufacturing. BPA enters in the aquatic environment mainly through urban and industrial sewage effluents, thereby posing a potential threat to organisms living in these ecosystems. This study was conducted to investigate the effect of BPA on VTG production with direct (sodium dodecyl sulfate-polyarylamide gel electrophoresis) and indirect (alkali-labile phosphate (ALP), total plasma calcium and protein) methods in immature male yellowfin seabream ( Acanthopagrus latus) as a marine fish model...
January 1, 2018: Toxicology and Industrial Health
Bonnie J Holmes, Lisa C Pope, Samuel M Williams, Ian R Tibbetts, Mike B Bennett, Jennifer R Ovenden
Multiple paternity has been documented as a reproductive strategy in both viviparous and ovoviviparous elasmobranchs, leading to the assumption that multiple mating may be ubiquitous in these fishes. However, with the majority of studies conducted on coastal and nearshore elasmobranchs that often form mating aggregations, parallel studies on pelagic, semi-solitary species are lacking. The tiger shark (Galeocerdo cuvier) is a large pelagic shark that has an aplacental viviparous reproductive mode which is unique among the carcharhinids...
January 2018: Royal Society Open Science
Tiago Figueiredo Abdo, Lucas Marcon, Nilo Bazzoli
To analyze the effect of the Irapé reservoir on the reproduction of "curimba", Prochilodus hartii, a migratory species, 503 specimens were collected during the reproductive period from February 2012 to January 2013. Specimens were collected from two river sections within the Jequitinhonha River Basin: Site 1 - a section of the Itacambiruçu River, a tributary of the Jequitinhonha River upstream of the Irapé reservoir; and Site 2 - a section of the Jequitinhonha River immediately downstream from the Irapé dam...
February 2, 2018: Animal Reproduction Science
Xiaocui Dong, Lemeng Zhang, Meng Chen, Zhibin Yang, Zhenghong Zuo, Chonggang Wang
Difenoconazole (DFZ) is a triazole fungicide which has been detected in the aquatic environment, including estuaries and embayments. However, few studies addressing the reproductive toxicity and transgenerational effects of DFZ on marine fishes are available. The present study was conducted to investigate the effects of DFZ on male marine medaka (Oryzias melastigma). After exposure of the embryo to 1, 10, 100 and 1000ng/L DFZ for 180days, the gonadosomatic index was significantly decreased in the 1000ng/L treatment...
January 2018: Journal of Environmental Sciences (China)
Miguel Gandra, Karim Erzini, David Abecasis
The protection provided by marine reserves directly depends on the short and long-term movement patterns of local organisms. Although there has been an increase in research assessing the behavioural patterns of fishes in reef-based habitats, there is still a paucity of studies addressing the benefits of marine protected areas (MPAs) for soft-sediment species. Here, we investigated both diel and seasonal shifts in spatial behaviour of the Senegalese sole, Solea senegalensis, within a recently-established marine reserve using long-term passive acoustic telemetry...
January 31, 2018: Marine Environmental Research
Liv Sandlund, Heidi Kongshaug, Tor Einar Horsberg, Rune Male, Frank Nilsen, Sussie Dalvin
The salmon louse is a marine ectoparasitic copepod on salmonid fishes. Its lifecycle consists of eight developmental stages, each separated by a molt. In crustaceans and insects, molting and reproduction is controlled by circulating steroid hormones such as 20-hydroxyecdysone. Steroid hormones are synthesized from cholesterol through catalytic reactions involving a 7,8-dehydrogenase Neverland and several cytochrome P450 genes collectively called the Halloween genes. In this study, we have isolated and identified orthologs of neverland, disembodied and shade in the salmon louse (Lepeophtheirus salmonis) genome...
2018: PloS One
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