The Developmental Physiology of the Zebrafish: Influence of Environment and Cardiovascular Attributes

Temperature effects on the development of the zebrafish embryos and larvae and adults were examined. It was found that the earlier in development a temperature change was performed on an embryo, the more significant the change in survival and/or subsequent development. Thus, viable temperature ranges for zebrafish widened significantly as development proceeded. Adults reared and bred at 25oC produced embryos that were significantly more successful at the lower range of rearing temperatures compared to embryos produced from adults reared at 28oC. The majority of this study focused on the physiological effects of swim training during development in the zebrafish. The earlier in development the zebrafish larvae were trained, the greater the mortality. Trained free swimming larvae had a significantly higher routine oxygen consumption after 11 days of training, and a higher mass specific routine metabolic rate after 8 and 11 days of training. Trained free swimming larvae consumed significantly less oxygen during swimming and were more efficient at locomotion, compared to control larvae. Training enhanced survival during exposure to extreme hypoxia in all age groups. Performance aspects of training were investigated in attempt to quantify training effects and in most cases, trained fish performed significantly better than controls. As blood vessels formed during development, they decreased in cross sectional area from days two to six. It was also shown that the variability in visual stroke volume measurements could be reduced significantly by using a third dimension in the analysis with a more accurate volume equation. Finally, the ontogeny of cardiac control was evaluated. The adrenergic receptors were the first to respond to pharmacological stimulation but were closely followed by cholinergic pharmacological stimulation a few days later. There was a significant cholinergic tone present in day 15 zebrafish larvae which persisted. Although an adrenergic tone was not documented in this study, this does not prove its lack of existence.

Grantor dc:publisher

University of North Texas

Year dc:date

2001

Author dc:creator

• Bagatto, Brian

Contributors dc:contributor

• Burggren, Warren W.
• Beitinger, Thomas L.
• Burleson, Mark
• Fitzpatrick, Lloyd
• Gross, Guenter W.
• Waller, William T.

• Zebra danio -- Physiology.
• Zebra danio -- Effect of temperature on.
• swim training
• metabolic rate
• hypoxia
• temperature effects
• zebrafish

Statement dc:rights

• Use restricted to UNT Community
• Copyright
• Bagatto, Brian
• Copyright is held by the author, unless otherwise noted. All rights reserved.

Language dc:language

English

Identifier

oclc: 51062152
https://digital.library.unt.edu/ark:/67531/metadc2854/
ark: ark:/67531/metadc2854

OAI identifier oai:identifier

info:ark/67531/metadc2854