Lipid-related thiamine deficiency cause mortality of river lampreys (Lampetra fluviatilis) during pre-spawning fasting

Oxygen consumption, ventilatory frequency and heart rate of lampreys (Lampetra fluviatilis) during their spawning run.

1. The standard rate of oxygen consumption, ventilatory frequency and heart rate of adult Lampetra fluviatilis were measured during the light phase of the photoperiod and at times corresponding to various stages in the upstream migration. 2. All three parameters increased during the spawning run but only in mature individuals were significant differences found between the sexes. 3. The regressi...

Oxygen dissociation curves of the blood of larval and adult lampreys (Lampetra fluviatilis).

1. An electrolytic method was used to plot the oxygen dissociation curves of whole blood from both the larva and adult of the lamprey Lampetra fluviatilis at a temperature of 10 degrees C and over a pH range of 6-5-8-1. 2. Larval blood has a far higher affinity for oxygen than that of adults, the respective calculated P50's at a pH of 7-75 being 1-9 and 10-7 mmHg. 3. The high affinity of larval...

The Osmoregulatory Ability of the Lampern (lampetra Fluviatilis L.) in Sea Water during the Course of Its Spawning Migration

The Food Hygienic Quality of European River Lamprey (lampetra Fluviatilis L.)

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A micropuncture study of kidney function in the river lamprey Lampetra fluviatilis adapted to sea water.

Micropuncture techniques have been used to investigate kidney function in lampreys adapted to hyperosmotic media. Plasma electrolyte concentrations were maintained well below corresponding concentrations in the external environment. Urine composition was variable, but generally showed high concentrations of magnesium, sulphate and chloride ions. Lampreys in 50% sea water produced urine which wa...