Survival, osmoregulation and oxygen consumption of YOY coastal largemouth bass,Micropterus salmoides (Lacepede) exposed to saline media |
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| Authors: | Gregorius N. Susanto Mark S. Peterson |
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| Affiliation: | (1) Department of Biological Sciences, Mississippi State University, P.O. Drawer GY, 39762 Mississippi State, Mississippi, USA;(2) Present address: Faculty of Mathematics and Natural Sciences (MIPA), University of Lampung, JL.S Brojonegoro, No. 1, 35145 Bandar Lampung, Indonesia;(3) Present address: Gulf Coast Research Laboratory, Fisheries Ecology Program, 703 East Beach Drive, 39564 Ocean Springs, Mississippi, USA |
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| Abstract: | The effect of salinity on survival, osmoregulation and oxygen consumption was determined on coastal young-of-the-year (YOY) largemouth bassMicropterus salmoides by exposing them to saline media of 0, 4, 8, 12, and 16‰. The data indicated a decrease in survival with longer exposure time and increased salinity. There were no significant differences in plasma osmolality with increased salinity from 0 to 8‰ but osmolality was significantly greater at 12‰ than 0‰ and osmolality from 16‰ was greater than all other salinity treatments. No significant differences in hematocrits were detected between 0 and 12‰, but hematocrits in the 16‰ treatment were significantly reduced compared to all other treatments. YOYM. salmoides are good osmoregulators up to 8‰ but increased salinity caused measurable osmoregulatory dysfunction. Oxygen consumption rate increased significantly as salinity increased, suggesting that adaptation of this species to hypersaline media is in part accompanied by increased energy expenditure. |
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| Keywords: | centrarchidae ontogeny osmoregulation oxygen consumption salinity |
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