Effects of one-year exposures to gas supersaturation on lake trout
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Abstract
Lake trout (Salvelinus namaycush) were reared for 1 year in water with one of six levels of incoming differential gas pressure (▵P): 4, 17, 33, 43, 58, or 75 mm Hg. Growth and survival of fish were evaluated as measures of response to the potential long‐term stress of elevated dissolved gases in rearing water. Mortality rates were not different among fish held in supersaturated water up to ▵P 58 (108% of total gas saturation), but mortality at ▵P 75 (110% saturation) was significantly higher after day 28. From days 21 to 35, the number of nonfeeding, moribund fish increased with increasing gas level. By day 56, the length and weight of fish were significantly greater at ▵P 4 than at higher gas levels. Growth rate reductions were evident for lake trout in ▵P 17 and above for more than 252 d. Feed conversion efficiency was significantly better in fish held at ▵Ps 4 and 17 than at higher pressures. Lake trout grew fastest and most efficiently at ▵P 4 for 252 d, but ▵P 58 was also a safe rearing level in terms of mortality. There were no signs of gas bubble formation in fish held at or below ▵P 58 and only 3% of the fish at ▵P 75 exhibited emphysemas after 269 d of exposure. For optimum growth of juvenile lake trout, total dissolved gas levels should be less than ▵P 17, probably near ▵P 0.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Effects of one-year exposures to gas supersaturation on lake trout |
| Series title | Progressive Fish-Culturist |
| DOI | 10.1577/1548-8640(1993)055%3C0169:EOOYET%3E2.3.CO;2 |
| Volume | 55 |
| Issue | 3 |
| Year Published | 1993 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Leetown Science Center |
| Description | 8 p. |
| First page | 169 |
| Last page | 176 |