Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878) (Pisces: Cichlidae) exposed to different temperatures and salinities
Tropical river sardine, Caquetaia kraussii, captured from La Aguá lagoon (Sucre State, Venezuela) were acclimatized for four weeks at 22, 24, 30 and 32ºC and at 0, 5, 10, 15 and 17 ‰ salinity. To evaluate effects of thermal response to acclimatization level, the fish were transferred suddenly from l...
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| Format: | Article |
| Language: | English |
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Vicerractoría Investigación
2001-03-01
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| Series: | Revista de Biología Tropical |
| Subjects: | |
| Online Access: | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442001000100014 |
| _version_ | 1797761160442806272 |
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| author | M.I. Segnini de Bravo K.S. Chung |
| author_facet | M.I. Segnini de Bravo K.S. Chung |
| author_sort | M.I. Segnini de Bravo |
| collection | DOAJ |
| description | Tropical river sardine, Caquetaia kraussii, captured from La Aguá lagoon (Sucre State, Venezuela) were acclimatized for four weeks at 22, 24, 30 and 32ºC and at 0, 5, 10, 15 and 17 ‰ salinity. To evaluate effects of thermal response to acclimatization level, the fish were transferred suddenly from lower temperatures (22 and 24ºC) to higher ones (32 and 30ºC) respectively. Then thermal resistance time was measured at the lethal temperature of 40.9ºC for 30 days. We considered that acclimatization process completed when resistance time was stabilized at the new temperature regime. For the saline effect, the concentrations of sodium and potassium were measured in the tissues at each treatment: gills, white muscle, gut and heart. The results showed that thermal tolerance increased rapidly in 3 h with a 6ºC rise in temperature (from 24 to 30ºC) and in 24 h with a 10ºC rise (22 to 32ºC). With decreasing temperatures, the acclimatization level reached its lowest in 11 days with a 6ºC decreases (from 30 to 24ºC) and in 14 days with a 10ºC decrease (32 to 22ºC). Caquetaia kraussii regulates as much sodium as potassium in gills and white muscle tissues at all salinity levels tested; however, gut and heart tissues showed significantly different regulations among salinities examined.<br>La sardina tropical de río, Caquetaia kraussii, capturada en la laguna La Aguá (Estado Sucre, Venezuela) fue aclimatada durante cuatro semanas a la temperatura de 22, 24, 30 y 32ºC y a 0, 5, 10, 15 y 17 ‰ de salinidad. Para evaluar los efectos de respuestas térmicas a los niveles de aclimatación, los peces fueron transferidos abruptamente desde las temperaturas bajas (22 y 24ºC) hasta las altas (32 y 30ºC) respectivamente. Se midió entonces la resistencia térmica a la temperatura letal de 40.9ºC durante 30 días. Se consideró que los peces habían alcanzado completamente su aclimatación cuando se estabilizaba al nuevo régimen de temperatura. Para el efecto salino, las concentraciones de sodio y potasio fueron determinadas en los tejidos: branquial, muscular, gástrico y cardíaco. Los resultados mostraron que la tolerancia térmica aumentaba rápidamente en 3 h cuando la diferencia de temperatura era de 6ºC (24 a 30ºC) y en 24 h cuando la diferencia era de 10ºC (22 a 32ºC). En los descensos de temperaturas, el nivel de aclimatación se alcanzó a los 11 días cuando el intercambio se hizo desde 30 a 24ºC y en 14 días con un descenso de 10ºC (32 a 22ºC). Los resultados indican que Caquetaia kraussii regula tanto sodio como potasio a nivel muscular y branquial a todos los niveles de salinidad estudiados; sin embargo a nivel gástrico y cardíaco se observaron regulaciones significativamente diferentes entre las salinidades examinadas. |
| first_indexed | 2024-03-12T19:09:55Z |
| format | Article |
| id | doaj.art-2ef4a921940749259f34b0a40b5c05e1 |
| institution | Directory Open Access Journal |
| issn | 0034-7744 2215-2075 |
| language | English |
| last_indexed | 2024-03-12T19:09:55Z |
| publishDate | 2001-03-01 |
| publisher | Vicerractoría Investigación |
| record_format | Article |
| series | Revista de Biología Tropical |
| spelling | doaj.art-2ef4a921940749259f34b0a40b5c05e12023-08-02T06:00:15ZengVicerractoría InvestigaciónRevista de Biología Tropical0034-77442215-20752001-03-01491149156Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878) (Pisces: Cichlidae) exposed to different temperatures and salinitiesM.I. Segnini de BravoK.S. ChungTropical river sardine, Caquetaia kraussii, captured from La Aguá lagoon (Sucre State, Venezuela) were acclimatized for four weeks at 22, 24, 30 and 32ºC and at 0, 5, 10, 15 and 17 ‰ salinity. To evaluate effects of thermal response to acclimatization level, the fish were transferred suddenly from lower temperatures (22 and 24ºC) to higher ones (32 and 30ºC) respectively. Then thermal resistance time was measured at the lethal temperature of 40.9ºC for 30 days. We considered that acclimatization process completed when resistance time was stabilized at the new temperature regime. For the saline effect, the concentrations of sodium and potassium were measured in the tissues at each treatment: gills, white muscle, gut and heart. The results showed that thermal tolerance increased rapidly in 3 h with a 6ºC rise in temperature (from 24 to 30ºC) and in 24 h with a 10ºC rise (22 to 32ºC). With decreasing temperatures, the acclimatization level reached its lowest in 11 days with a 6ºC decreases (from 30 to 24ºC) and in 14 days with a 10ºC decrease (32 to 22ºC). Caquetaia kraussii regulates as much sodium as potassium in gills and white muscle tissues at all salinity levels tested; however, gut and heart tissues showed significantly different regulations among salinities examined.<br>La sardina tropical de río, Caquetaia kraussii, capturada en la laguna La Aguá (Estado Sucre, Venezuela) fue aclimatada durante cuatro semanas a la temperatura de 22, 24, 30 y 32ºC y a 0, 5, 10, 15 y 17 ‰ de salinidad. Para evaluar los efectos de respuestas térmicas a los niveles de aclimatación, los peces fueron transferidos abruptamente desde las temperaturas bajas (22 y 24ºC) hasta las altas (32 y 30ºC) respectivamente. Se midió entonces la resistencia térmica a la temperatura letal de 40.9ºC durante 30 días. Se consideró que los peces habían alcanzado completamente su aclimatación cuando se estabilizaba al nuevo régimen de temperatura. Para el efecto salino, las concentraciones de sodio y potasio fueron determinadas en los tejidos: branquial, muscular, gástrico y cardíaco. Los resultados mostraron que la tolerancia térmica aumentaba rápidamente en 3 h cuando la diferencia de temperatura era de 6ºC (24 a 30ºC) y en 24 h cuando la diferencia era de 10ºC (22 a 32ºC). En los descensos de temperaturas, el nivel de aclimatación se alcanzó a los 11 días cuando el intercambio se hizo desde 30 a 24ºC y en 14 días con un descenso de 10ºC (32 a 22ºC). Los resultados indican que Caquetaia kraussii regula tanto sodio como potasio a nivel muscular y branquial a todos los niveles de salinidad estudiados; sin embargo a nivel gástrico y cardíaco se observaron regulaciones significativamente diferentes entre las salinidades examinadas.http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442001000100014Thermal acclimatizationsalinityelectrolytic concentrationCaquetaia kraussii |
| spellingShingle | M.I. Segnini de Bravo K.S. Chung Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878) (Pisces: Cichlidae) exposed to different temperatures and salinities Revista de Biología Tropical Thermal acclimatization salinity electrolytic concentration Caquetaia kraussii |
| title | Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878) (Pisces: Cichlidae) exposed to different temperatures and salinities |
| title_full | Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878) (Pisces: Cichlidae) exposed to different temperatures and salinities |
| title_fullStr | Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878) (Pisces: Cichlidae) exposed to different temperatures and salinities |
| title_full_unstemmed | Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878) (Pisces: Cichlidae) exposed to different temperatures and salinities |
| title_short | Ecophysiological behavior of Caquetaia kraussii (Steindachner, 1878) (Pisces: Cichlidae) exposed to different temperatures and salinities |
| title_sort | ecophysiological behavior of caquetaia kraussii steindachner 1878 pisces cichlidae exposed to different temperatures and salinities |
| topic | Thermal acclimatization salinity electrolytic concentration Caquetaia kraussii |
| url | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442001000100014 |
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