Oxygen consumption of the larvae of pike (Esox lucius L.) and sheat-fish (Silurus glanis L.) at temperatures of 0,5 to 28 °C

Woynárovich, Elek (1960) Oxygen consumption of the larvae of pike (Esox lucius L.) and sheat-fish (Silurus glanis L.) at temperatures of 0,5 to 28 °C. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 27. pp. 183-191. ISSN 0365-3005

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Abstract

Investigations were made to ascertain the oxygen consumption of the larvae of a fish spawning in cool water (Esox) and of one spawning in warm water (Silurus) at seven different temperatures between 0,5 and 28° G. The oxygen consumption of 100 larvae is shown in Table 1, and the values (in mg/hour,) of oxygen consumption as calculated to 1 g dry substance are given in Table 2. The oxygen consumption was measured at these given temperatures in three different stages of development: 1 . in freshly-hatched larvae (I); 2 . larvae in mid-development (II); and 3. larvae respiring through the gills, the yolk substance already consumed but before they begin to food (III). Larval oxygen consumption changes considerably with changes in temperature and as development progresses. At the different degrees of temperature the quotient of the increase in oxygen consumption between two stages of development is not the same. The lowest quotient is found in the pike larva at 15 °C and in the sheat-fish larva at 25 °C. Values surpassing the mean of the quotients are for the pike (which spawns in cool water) at 25 to 28 °C and for the sheat-fish (which spawns in warm water) at 15-10-5 and 0,5° C. (See Table 4 and Fig. 1). The quotients for the oxygen consumption of the larvae in mid-development also change but in this phase of development the value of the quotient of the pike larva rises above the average at 5 and 0,5 °C. This is explained by the fact that the pike larva in this stage of development is exceptionally sensitive to cold. The oxygen consumption of the sheat-fish larva as calculated to 1 g dry substance equals that of a pike larva in the same stage and differs only at low temperatures, in which case it is considerably smaller in absolute values.

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