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Stages of embryonic development from zygote to hatching in the viviparous fish, Gambusia holbrooki


Mousavi, SE and Patil, JG and Purser, GJ, Stages of embryonic development from zygote to hatching in the viviparous fish, Gambusia holbrooki, Australian Society for Fish Biology Conference 2018 Abstracts, 07-11 October 2018, Melbourne (2018) [Conference Extract]

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Developmental staging is indispensable to study developmental pathways, genetics and evolution among taxa. Life-history stages have been described for few Poeciliid species, however, proposed classifications are not generally applicable due to divergent morphology among the different Poeciliid species. In Poeciliid, with placentation developmental strategy, embryos receive the maternal investment throughout gestation. Therefore, normal morpho-physiological characteristics are often compromised by applying previously employed in vitro culture and embryo fixation approaches. Here, we describe the early development of the embryonic process in a livebearing fish, Gambusia holbrooki, based on detailed morphological diagnostics and overlay cardiac rate in developing embryos under normal conditions. Light microscopy observations of live embryos obtained from gravid wild captured females, allowed assignment of the development process into seven periods: zygote, cleavage, blastula, gastrula, segmentation, Pharyngula, and hatching. Thirty-seven stages were determined and assigned within each of these periods applying a numbered staging system. The novelty of the present study is the real-time, in vivo quantification of heart rhythm variations as a marker for embryonic staging from early gastrulation to late hatching. Moreover, at least one morphologic landmark for each of the embryonic stages was defined to maximize the accuracy of staging.

Item Details

Item Type:Conference Extract
Keywords:Poecillid, developmental stages, diagnostic features, morphological marker, heartbeat, Gambusia holbrooki
Research Division:Biomedical and Clinical Sciences
Research Group:Reproductive medicine
Research Field:Reproduction
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Control of pests, diseases and exotic species in coastal and estuarine environments
UTAS Author:Mousavi, SE (Mr Seyed Ehsan Mousavi)
UTAS Author:Patil, JG (Dr Jawahar Patil)
UTAS Author:Purser, GJ (Associate Professor John Purser)
ID Code:130017
Year Published:2018
Deposited By:Fisheries and Aquaculture
Deposited On:2019-01-06
Last Modified:2019-01-17

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