The influence of temperature on the embryonic development of the annual fish Cynopoecilus melanotaenia (Cyprinodontiformes, Rivulidae)
Braz. j. biol
;
62(4b): 743-747, Nov. 2002. tab
Article
in English
| LILACS
| ID: lil-339372
RESUMO
The present study aims to provide data about the time required for Cynopoecilus melanotaenia kept at different temperatures to complete embryonic development. This information can be valuable for optimizing laboratory culture and facilitating future use of this species as a test organism in toxicity tests. Temperature effects on hatching rate are presented as well as information related to embryonic development stages. Eggs were observed daily, from start to finish of embryonic development. Thirteen developmental stages were described. Eggs were kept at two constant temperatures (20°C and 25°C) and at a variable ambient temperature (16-25°C - mean = 21°C, sd = 1.95), to determine developmental rate (velocity) at each temperature. A shorter incubation period was necessary to complete development at 25° ± 1°C. However, all embryos kept at this temperature hatched with morphological defects, which prevented their survival. No significant difference in developmental time period (p = 0.05) was observed at the 20°C and 16°-25°C (mean = 21°C, sd = 1.95) temperatures
Full text:
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Index:
LILACS (Americas)
Main subject:
Temperature
/
Cyprinodontiformes
/
Embryo, Nonmammalian
Limits:
Animals
Language:
English
Journal:
Braz. j. biol
Journal subject:
Biology
Year:
2002
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Federal do Rio Grande do Sul/BR
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