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Oxygen consumption by eggs of the grubby, Myoxocephalus aenaeus , and the longhorn sculpin, Myoxocephalus octodecemspinosus

1989; NRC Research Press; Volume: 67; Issue: 7 Linguagem: Inglês

10.1139/z89-230

1480-3283

William A. Walsh, William A. Lund,

Fish biology, ecology, and behavior

Oxygen consumption rates of individual eggs of the grubby, Myoxocephalus aenaeus, and the longhorn sculpin, Myoxocephalus octodecemspinosus, were determined by microrespirometry. Eggs of both species were incubated in temperature – salinity combinations (grubby: in 2, 5, 8 °C at 10, 12.5, 15, 20, 25, 30, 35 parts per thousand (ppt); longhorn sculpin: in 2, 5, 8 °C at 15, 17.5, 20, 25, 30, 35 ppt) to determine the effects of these abiotic factors and development on oxygen consumption rates. Respiration rates of eggs of both species were not affected significantly by constant salinities. Multiple regression analyses demonstrated that the natural logarithms of oxygen uptake rates increased linearly with the temperature – age (in hours after fertilization) interaction and parabolically with age in both species. Oxygen consumption rates increased at hatching. Acute salinity changes did not affect embryonic oxygen consumption by either species. An acute temperature increase, however, elicited increased oxygen uptake by longhorn sculpin embryos (Q 10 = 2.56).