Oxygen consumption of two marine teleosts, Lithognathus mormyrus (linnaeus, 1758) and Lihognathus lithognathus (cuvier, 1830) (Teleosti: Sparidae)
1986; Elsevier BV; Volume: 85; Issue: 2 Linguagem: Inglês
10.1016/0300-9629(86)90257-4
ISSN0300-9629
AutoresH.H. Du Preez, W. J. Strydom, P.E.D. Winter,
Tópico(s)Fish Ecology and Management Studies
Resumo1. The oxygen consumption of two shallow water teleosts,Lithognathus mormyrus and Lithognathus lithognathus was determined at 10, 15, 20 and 25°C. 2. Oxygen consumption of the experimental fish fluctuated for the first 9–12 hr. 3. L. mormyrus generally showed a nocturnal peak and L. lithognathus a diurnal peak in routine oxygen consumption. 4. The value of the exponent b in the mass/metabolism equation for the routine oxygen consumption of the two species varied between 0.29 and 0.43 (Mean: L. mormyrus, 0.34; L. lithognathus, 0.31) and was temperature independent. 5. Starving the teleosts resulted in a maximum decrease in active, routine and standard oxygen consumption of 51, 47 and 56%, respectively. 6. The maximum rates of oxygen consumption of the two species induced by feeding were 1.22–5.85 and 1.40–2.97 times the routine value for teleosts that have been starved for 40 and 162 hr, respectively. 7. The estimated heat increments for L. mormyrus and L. lithognathus starved for 40 hr were 31.5 and 14.5%, respectively, and 18.8 and 20.8%, respectively, when starved for 162 hr.
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