To address this question, we established an ex vivo system to culture zebrafish blastoderm tissue explants lacking the yolk cell and its associated YSL. Stages of Embryonic Development of the Zebrafish Danio rerio (Hamilton) Spirita Sharmili V, Ahila Angelin J Abstract We describe a series of stages for development of the embryo of the zebrafish, Danio rerio. Laboratory zebrafish embryos and larvaare normally maintained in incubators d uring the first week (7 days) after egg fertilization. The embryos were embedded in agarose, kept at a constant temper-ature (26.5°C) [see (13) for developmental stages] So too are the new behavioral assays that are being adapted from rodent research for use in zebrafish embryos, and which may become relevant in validating the effects of neuroactive compounds such as anxiolytics and antidepressants. We describe a series of stages for development of the embryo of the zebrafish, Danio (Brachydanio) rerio. The zebrafish (Danio rerio) is an increasingly popular animal model biological system. We therefore turned to zebrafish embryos, whose external development and transparency provide good access to almost every stage of embryogenesis. Zebrafish undergo sexual reproduction, so breeding requires both male and female fish. The full life cycle from fertilized egg to adult is a quick 90 days. Zebrafish larvae display raldh2 expression in the pronephric ducts as do Xenopus and chicken ( Chen et al., 2001 ; Berggren et al., 1999 ). In this study, a micromechanical force sensing system was used to characterize and quantitate mechanical modifications of the zebrafish embryo chorion during early development. German scientists published new work on zebrafish embryonic development. So too are the new behavioral assays that are being adapted from rodent research for use in zebrafish embryos, and which may become relevant in validating the effects of neuroactive compounds such as anx-iolytics and antidepressants. Zebrafish embryos are exposed to TCS (control, negative control, 0.2, 0.4, 0.6, and 0.8 mg/l) for 96 h post fertilization (hpf). We define seven broad periods of embryogenesis—the zygote, cleavage, blastula, gastrula, segmentation, pharyngula, and hatching periods. Lethal and sublethal effects on embryo-larval stages of zebrafish in a study of the developmental toxicity of doxorubicin were observed. Using the hspa8 promoter, we generated transgenic zebrafish lines that express mAG-hGem(1/110) or mKO2-hCdt1(30/120). In this research, we report on an in vivo stain-free blood vessel imaging technique at pre-larval stages of zebrafish embryonic development. In the present study, foldscope is used as an innovative tool to study the developmental stages and toxicological analysis of the zebrafish embryos. Toxic effects of Triclosan (TCS) in zebrafish embryo development. In order to analyze zebrafish embryonic de-velopment, we recorded stacks of ~400 images (2048 by 2048 pixels each) in intervals of 60 or 90 s and along two opposing directions (Fig. Images of zebrafish embryos were obtained using the VAST Bioimager (Union Biometrica, Gees, Belgium) (Pardo-Martin et al., 2010; Pulak, 2016) with the on-board camera of 10 µm resolution. In order to generate embryos, it helps to know a little bit about zebrafish mating behavior. Zebrafish or Danio rerio is an established model organism for studying the genetic, neuronal and behavioral bases of diseases and for toxicology and drug screening. Evaluated parameters included survival, development, behaviour and neuronal biochemical markers. In zebrafish, lsd1 is expressed throughout the developing stages: from the one cell embryo the expression pattern becomes restricted to the anterior of the embryo and is particularly enriched at the neural structures as embryonic development progresses. Briefly, the developmental stages, such as zygote, cleavage, blastula, gastrula, segmentation, and pharyngula formation are observed and documented using simple foldscope. This video will cover the basics of embryo collection and handling before describing current research methods that take advantage of zebrafish embryos. The fertilized zebrafish eggs were harvested in hundreds and eggs were raised (one-cell stage) in a glass-plated petri dish filled with E3 embryo medium (in mM: 5 NaCl, 0.17 KCl, 0.33 CaCl, 0.33 MgSO 4 and 0.00001% Methylene Blue) and kept at 28°C. The embryo weight of zebrafish is not easy to be accurately weighed, and there are great differences among different batches of experiments, so it is suggested to weigh the dry weight. Reasons UO covers all stages of zebrafish development - PHS Policy rationale for approximate number - OLAW guidance on hatching - Justification of number of adults needed - Embryos larvae juveniles - Compliance issues - Legal definition of vertebrate animal - Care for embryos / early larvae - IACUC protocol template In general, a reduced growth rate was seen when tumor cells lines were treated with factors drawn during the different developmental stages, ranging from 73% reduction for the glioblastoma (A) Survival rates, (B) Hatching rates, and (C) Heart beats per 15 s until 96 hpf. During zebrafish development, scl is ex-pressed from the 2 to 3 somite stage in the hemangioblast The following are some of the main stages of the lifecycle of a Zebrafish: Unfertilized egg; Embryo; Larval stage; Juvenile; Adult; A female Zebrafish can produce as many as several hundreds of eggs per spawning. The objective of this study was to evaluate the toxicity and developmental effects of captan on different life stages (embryo and adult) of zebrafish (Danio rerio).The results showed that the 96-h lethal concentration 50 (LC 50) values of embryo and adult zebrafish (exposed to captan) were 0.81(0.75−0.87) mg/L and 0.65(0.62−0.68) mg/L, respectively. Spatio-temporal analysis of gene a expression in zebrafish embryos. So far, all the studies on zebrafish embryonic proteome were conducted on embryos being at a certain developmental advancement, and the informat ion on the early stages, particularly before the maternal-to-zygotic transition (MZT), is missing. Zebrafish embryos dechorionate (hatch) at approximately 72 hours post We define seven broad periods of embryogenesis-the zygote, cleavage, blastula, gastrula, segmentation, pharyngula, and hatching periods. Numbers in each panel represent embryos used for the experiment and embryos with the result shown in the image. stage of development at a given time post fertilization, but a consistent temperature is not critical for the health or welfare of the embryo. 2 and movies S2 and S3). The zebrafish embryo, at different development stages (that is critical time-points for embryo development) has been studied under treatment with AL. zebrafish embryos in early stages of drug safety-screening is discussed. In cardiovascular research, it has been used to model specific cardiac phenomena as well as to identify novel therapies for human cardiovascular disease. During late embryonic and larval stages, distinct local foci of raldh2 expression are seen in tetrapods and zebrafish. Abstract: During early development, the chorion envelope of the zebrafish embryo undergoes a thinning process called "chorion softening," which has so far only been characterized chemically. While the zebrafish cardiovascular system functioning is well examined at larval stages, the mechanisms by which vessel activity is initiated remain a subject of intense investigation. The zebrafish lifecycle is divided into four major periods: Embryo, larva, juvenile, and adult. Abstract. The scl gene has also been extensively studied in the zebrafish hematopoiesis field. In order to understand more fully the effects of AL on the embryos studied, data were collected on key aspects: their death rate, hatchability, malformation rate, voluntary movement and heart rate. Figure 1. Embryo stages were determined by morphological criteria according to Kimmel et al. The use of zebrafish embryos in early stages of drug safety‐screening is discussed. The use of zebrafish embryos as models at 5 dpf adheres to these principles and greatly reduces the use of mammals in later stages of research. Early development occurs at a rapid, but predictable rate when the embryos are raised at 28 °C. Readouts, such as morphological screening High doses of acetaminophen cause lethal impairments such as yolk sac malformation, whereas lower doses lead to pigmentation abnormalities or tail malformations 14. Zebrafish developmental stages webs.com Zebrafish as a Developmental System ucalgary.ca Illustration of developmental stage of zebrafish embryo ... researchgate.net The deformities caused by the drug on zebrafish embryos are dose-dependent and occur at different stages of development 14. Batteries of embryo larval assays with zebrafish were performed to evaluate the potential effects of FLX exposure, including environmentally relevant concentrations. Automated imaging of zebrafish embryos. Zebrafish embryos were incubated at 28°C in embryo water until reaching the desired developmental stage. Representative images of embryos at early (A) or later (B) stages of development, hybridized with a probe specific for c19orf12a mRNA. Importantly, total respiration measured for zebrafish embryos at different developmental stages with the XF24 reproduce the total respiration for zebrafish embryos from 5.5–48 hpf reported by Mendelsohn et al., who used a Clark-type electrode . factors taken from Zebrafish embryos at different develop-mental phases, specific of the beginning, intermediate and final embryonic differentiation stages. Five dpf zebrafish embryos are commonly used to assess toxicology of pesticides and insecticides in aqueous environments. In addition, Scl-/-embryos are not able to initiate primitive erythropoiesis, indicating its requirement in primitive hematopoiesis (Shivdasani et al., 1995). 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