Osmoregulation of juvenile marine goliath grouper (Epinephelus itajara) in low-salinity water
Background: goliath grouper (Epinephelus itajara) is an economically valuable marine species and an excellent candidate for domestication for aquaculture purposes. If this grouper can osmoregulate in lowsalinity water, its cultivation can provide socio-economic benefits, for both coastal communities...
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| Format: | Article |
| Language: | English |
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Universidad de Antioquia
2013-06-01
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| Series: | Revista Colombiana de Ciencias Pecuarias |
| Subjects: | |
| Online Access: | http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-06902013000200008&lng=en&tlng=en |
| _version_ | 1818059716061822976 |
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| author | Lury N García Clara L Sierra Jeiver Perez Frank Esquivel Frank A Chapman |
| author_facet | Lury N García Clara L Sierra Jeiver Perez Frank Esquivel Frank A Chapman |
| author_sort | Lury N García |
| collection | DOAJ |
| description | Background: goliath grouper (Epinephelus itajara) is an economically valuable marine species and an excellent candidate for domestication for aquaculture purposes. If this grouper can osmoregulate in lowsalinity water, its cultivation can provide socio-economic benefits, for both coastal communities and the mainland agricultural sector. Objective: to evaluate the osmoregulatory capacity of juvenile goliath grouper when exposed to low-salinity water. Methods: juvenile goliath grouper (Epinephelus itajara) were either directly or gradually transferred from seawater to freshwater to test osmoregulatory ability. Body weight was assessed during acclimation and blood samples were taken to measure total osmolality and electrolytes. Results: all fish survived the transfer to freshwater and were maintained for up to 12 days after termination of the acclimation trials which lasted 72 hours. Juvenile goliath grouper were hyposmotic (342-462 mosmol/kg) to seawater and hyperosmotic (272-292 mosmol/kg) to freshwater. The gills and kidneys were found to have principal roles in the osmoregulatory processes. Numerous chloride cells were found on superficial regions of the gill filament epithelium, most likely serving to eliminate the excess of electrolytes while in seawater. The kidneys had numerous nephrons to make urine and retain electrolytes while in freshwater. Conclusions: these observations lead to the conclusions that juvenile goliath grouper have the ability to osmoregulate in freshwater and should be considered a marine euryhaline species. Such adaptability opens for consideration the possibility that goliath grouper could be successfully farmed in brackish water or even in freshwater. |
| first_indexed | 2024-12-10T13:20:56Z |
| format | Article |
| id | doaj.art-3d4addc3b9bc4d16b3b62460901fc9a6 |
| institution | Directory Open Access Journal |
| issn | 0120-0690 |
| language | English |
| last_indexed | 2024-12-10T13:20:56Z |
| publishDate | 2013-06-01 |
| publisher | Universidad de Antioquia |
| record_format | Article |
| series | Revista Colombiana de Ciencias Pecuarias |
| spelling | doaj.art-3d4addc3b9bc4d16b3b62460901fc9a62022-12-22T01:47:20ZengUniversidad de AntioquiaRevista Colombiana de Ciencias Pecuarias0120-06902013-06-01262127135S0120-06902013000200008Osmoregulation of juvenile marine goliath grouper (Epinephelus itajara) in low-salinity waterLury N García0Clara L Sierra1Jeiver Perez2Frank Esquivel3Frank A Chapman4Universidad del PacíficoUniversidad del PacíficoUniversidad del PacíficoUniversidad del PacíficoUniversity of FloridaBackground: goliath grouper (Epinephelus itajara) is an economically valuable marine species and an excellent candidate for domestication for aquaculture purposes. If this grouper can osmoregulate in lowsalinity water, its cultivation can provide socio-economic benefits, for both coastal communities and the mainland agricultural sector. Objective: to evaluate the osmoregulatory capacity of juvenile goliath grouper when exposed to low-salinity water. Methods: juvenile goliath grouper (Epinephelus itajara) were either directly or gradually transferred from seawater to freshwater to test osmoregulatory ability. Body weight was assessed during acclimation and blood samples were taken to measure total osmolality and electrolytes. Results: all fish survived the transfer to freshwater and were maintained for up to 12 days after termination of the acclimation trials which lasted 72 hours. Juvenile goliath grouper were hyposmotic (342-462 mosmol/kg) to seawater and hyperosmotic (272-292 mosmol/kg) to freshwater. The gills and kidneys were found to have principal roles in the osmoregulatory processes. Numerous chloride cells were found on superficial regions of the gill filament epithelium, most likely serving to eliminate the excess of electrolytes while in seawater. The kidneys had numerous nephrons to make urine and retain electrolytes while in freshwater. Conclusions: these observations lead to the conclusions that juvenile goliath grouper have the ability to osmoregulate in freshwater and should be considered a marine euryhaline species. Such adaptability opens for consideration the possibility that goliath grouper could be successfully farmed in brackish water or even in freshwater.http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-06902013000200008&lng=en&tlng=enacuicultura de conservacióncélulas de cloruroeurihalinonefronastolerancia a la salinidad |
| spellingShingle | Lury N García Clara L Sierra Jeiver Perez Frank Esquivel Frank A Chapman Osmoregulation of juvenile marine goliath grouper (Epinephelus itajara) in low-salinity water Revista Colombiana de Ciencias Pecuarias acuicultura de conservación células de cloruro eurihalino nefronas tolerancia a la salinidad |
| title | Osmoregulation of juvenile marine goliath grouper (Epinephelus itajara) in low-salinity water |
| title_full | Osmoregulation of juvenile marine goliath grouper (Epinephelus itajara) in low-salinity water |
| title_fullStr | Osmoregulation of juvenile marine goliath grouper (Epinephelus itajara) in low-salinity water |
| title_full_unstemmed | Osmoregulation of juvenile marine goliath grouper (Epinephelus itajara) in low-salinity water |
| title_short | Osmoregulation of juvenile marine goliath grouper (Epinephelus itajara) in low-salinity water |
| title_sort | osmoregulation of juvenile marine goliath grouper epinephelus itajara in low salinity water |
| topic | acuicultura de conservación células de cloruro eurihalino nefronas tolerancia a la salinidad |
| url | http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-06902013000200008&lng=en&tlng=en |
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