Resumo

ZAPATA, Ana Antonia et al. Effect of salinity on the gill ventilation frequency of Dormitator latifrons (Richardson, 1984). Ecosistemas y recur. agropecuarios [online]. 2019, vol.6, n.18, pp.601-607.  Epub 20-Fev-2020. ISSN 2007-901X.  https://doi.org/10.19136/era.a6n18.2179.

Dormitator latifrons inhabits a wide range of salinities as a result of its migratory and reproductive cycle. The objective of the study was to evaluate the physiological response time and survival to saline change under laboratory conditions. The basal gill ventilation frequency (GVF) of organisms was recorded at 33 ups (SW) and in freshwater at 0.3 ups (FW). The gill ventilation frequency of organisms that were transferred from FW-SW and inversely from SW-FW (15, 25, and 33 ups) was counted, in triplicate, for 1 minute and 1, 4, 24 and 48 h. Statistical differences (p < 0.05) were found in fish transferred from FW-SW and SW-FW at the first minute with respect to basal GVF. In all treatments the organisms recovered their GVF one hour after being exposed to saline modification. There was 100% survival in all treatments. D. latifrons has a rapid physiological response to sudden changes in salinity.

Palavras-chave : Adaptation; environmental conditions; stress; native fish.