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Data from: Hypoxia tolerance is unrelated to swimming metabolism of wild, juvenile striped bass (Morone saxatilis)

Citation

Kraskura, Krista; Nelson, Jay (2020), Data from: Hypoxia tolerance is unrelated to swimming metabolism of wild, juvenile striped bass (Morone saxatilis), Dryad, Dataset, https://doi.org/10.25349/D9RK54

Abstract

Juvenile striped bass reside in the Chesapeake Bay where they are likely to encounter hypoxia that could affect their metabolism and performance. The ecological success of this economically valuable species may depend on their ability to tolerate hypoxia and perform fitness-dependent activities in hypoxic waters. We tested whether there is a link between hypoxia tolerance (HT) and oxygen consumption rate (MO2) of juvenile striped bass measured while swimming in normoxic and hypoxic water, and to identify the interindividual variation and repeatability of these measurements. Fish (N = 18) had their HT (loss of equilibrium) measured twice collectively, 11 weeks apart, between which each fish had their MO2 measured individually while swimming in low flow (10.2 cm s-1) and high flow (~ 67% Ucrit) under normoxia and hypoxia. Both HT and MO2 varied substantially among individuals. HT increased across 11 weeks while the rank order of individual HT was significantly repeatable. Similarly, MO2 increased in fish swimming at high flow in a repeatable fashion, but only within a given level of oxygenation. MO2 was significantly lower when fish were swimming against high flow under hypoxia. There were no clear relationships between HT and a fish&[prime]s MO2 while swimming under any conditions. Only the magnitude of increase in HT over 11 weeks and an individual&[prime]s MO2 under low flow were correlated. The results suggest that responses to the interacting stressors of hypoxia and exercise vary among individuals, and that HT and change in HT are not simple functions of aerobic metabolic rate. 

Methods

1. Hypoxia tolerance was determined following hypoxia challange test protocol (see methods in published article). Hypoxia tolerance is expressed as cumulative oxygen deficit. Fish ID, size, and date of repeat tests are provided. 

2. Oxygen consumption rates were measured in swim tunnel respirometer. Metabolic performance was measured in fish under normoxic and hypoxic conditions at low and high flow. Oxygen consumption data represent visually inspected data, after it was corrected for background respiration. Fish ID, size and date of tests are provided. 

Usage Notes

Repeat hypoxia tolerance, oxygen consumption rates under hypoxia and normoxia and two flow rates, body size, and cost of transport data of individual juvenile striped bass. These data are supplementary to "Hypoxia tolerance is unrelated to swimming metabolism of wild, juvenile striped bass (Morone saxatilis)" manuscript accepted in the Journal of Experimantal Biology.