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Striped Bass Exercise and Handling Stress in Freshwater: Physiological Responses to Recovery Environment
Author(s) -
Cech Joseph J.,
Bartholow Steven D.,
Young Paciencia S.,
Hopkins Todd E.
Publication year - 1996
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1996)125<0308:sbeahs>2.3.co;2
Subject(s) - bass (fish) , brackish water , zoology , acidosis , chemistry , seawater , salinity , medicine , biology , fishery , ecology
Freshwater‐acclimated subadult striped bass Morone saxatilis that had undergone cannulation of the dorsal aorta were exercised against a water current at 100 cm·sec −1 (2–3 fork lengths·sec −1 ) for 5 min in freshwater and placed in flow‐through holding boxes in a recovery tank at 25°C. Recovery tanks contained water with either 0 (freshwater, FW), 10 (brackish water, BW), or 30 (seawater, SW) g NaCl·L −1 or 10 mM NaHCO 3 − ·L −1 (buffered freshwater, BFW). A postexercise metabolic acidosis (decreased postexercise blood pH and increased blood lactate) was compensated within 2–4 h in all recovery environments except SW. Arterial O 2 tension and cortisol, glucose, and hemoglobin concentrations transiently increased immediately after exercise, and arterial CO 2 tension and HCO 3 − generally decreased. Plasma Cl − did not change until 2–4 h postexercise, when decreases (FW and BFW), an increase (SW), or no change (BW) indicated passive fluid or Cl − exchanges with the recovery environment. Increasing plasma Cl − in the SW recovery environment inhibited HCO 3 − retention or uptake, which slowed pH compensation. In summary, postexercise acidoses were corrected and ionic imbalances were minimized by recovery in brackish water (10 g NaCl·L −1 ).