The influence of temperature on the embryonic development of the annual fish Cynopoecilus melanotaenia (Cyprinodontiformes, Rivulidae)

Brazilian Journal of Biology

A. Arenzon¹  C. A. Lemos¹  M. B. C. Bohrer¹ 

[1] ,Universidade Federal do Rio Grande do Sul Centro de Ecologia Porto Alegre RS ,Brazil

关键词: annual fish;    temperature;    Cynopoecilus melanotaenia;    embryonic development;    peixe anual;    temperatura;    Cynopoecilus melanotaenia;    desenvolvimento embrionário;   

DOI  :  10.1590/S1519-69842002000500002

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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