Abstract
The total rate of N-waste excretion (M N) in juvenile tambaqui living in ion-poor Amazonian water comprised 85 % ammonia-N (M Amm-N) and 15 % urea-N (M Urea-N). Both occurred mainly across the gills with only ~5 % of M Amm-N and ~39 % of M Urea-N via the urine. Tambaqui were not especially tolerant to high environmental ammonia (HEA), despite their great resistance to other environmental factors. Nevertheless, they were able to maintain a continued elevation of M Amm-N during and after 48-h exposure to 2.5 mmol L−1 HEA. The normally negative transepithelial potential (−18 mV) increased to −9 mV during the HEA period, which would help to reduce branchial NH4 + entry. During 3 h of acute environmental hypoxia (30 % saturation), M Amm-N declined, and recovered thereafter, similar to the response seen in other hypoxia-tolerant teleosts; M Urea-N did not change. However, during gradual hypoxia, M Amm-N remained constant, but M Urea-N eventually fell. The acute temperature sensitivities of M Amm-N and M N were low from 28 °C (acclimation) to 33 °C (Q10 ~1.5), but high (~3.8) from 33 to 38 °C, relative to \( M_{{{\text{O}}_{ 2} }} \) (~1.9 throughout). In contrast, M Urea-N exhibited a different pattern over these temperature ranges (Q10 2.6 and 2.1, respectively). The nitrogen quotient (NQ = 0.16–0.23) was high at all temperatures, indicating a 60–85 % reliance on protein to fuel aerobic metabolism in these fasting animals. During steady-state aerobic exercise, \( M_{{{\text{O}}_{ 2} }} \) and M Urea-N increased in parallel with velocity (up to 3.45 body lengths s−1), but M Amm (and thus M N) remained approximately constant. Therefore, the NQ fell progressively, indicating a decreasing reliance on protein-based fuels, as work load increased. In group feeding trials using 45 % protein commercial pellets, tambaqui excreted 82 % (range 39–170 %) of the dietary N within 24 h; N-retention efficiency was inversely related to the ration voluntarily consumed. M Amm-N peaked at 4–6 h, and M Urea-N at 6–9-h post-feeding, with an additional peak in M Amm-N only at 21 h. During subsequent fasting, M N stabilized at a high endogenous rate from 2 through 8 days post-feeding. Possible reasons for the high wasting of protein-N during both fasting and feeding are discussed.
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Acknowledgments
We thank two anonymous reviewers for constructive comments. Supported in Brazil by FAPEAM and CNPq through the INCT-ADAPTA grant to ALV, and a Science Without Borders Program grant to ALV and CMW (CNPq process number: 401303/2014-4), and in Canada by a Discovery grant to CMW from the Natural Sciences and Engineering Research Council of Canada (NSERC). CMW was supported by the Canada Research Chairs program and a visiting fellowship from the Science Without Borders Program (CNPq-Brazil). RMD received a postdoctoral fellowship from the same program (CNPq process number: 151083/2013-4). JGSN received a PCI fellowship from INPA/CNPq. JMW was supported by the INCT-ADAPTA grant to ALV and a Portuguese Foundation for Science and Technology grant (FCT) PTDC/MAR/98035 and the European Regional Development Fund (COMPETE—Operational Competitiveness Program) and national funds through FCT (Pest-C/MAR/LA0015/2011). ALV received a research fellowship from CNPq.
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Wood, C.M., de Souza Netto, J.G., Wilson, J.M. et al. Nitrogen metabolism in tambaqui (Colossoma macropomum), a neotropical model teleost: hypoxia, temperature, exercise, feeding, fasting, and high environmental ammonia. J Comp Physiol B 187, 135–151 (2017). https://doi.org/10.1007/s00360-016-1027-8
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DOI: https://doi.org/10.1007/s00360-016-1027-8