Treatment with thiamine hydrochloride and astaxanthine for the prevention of yolk-sac mortality in Baltic salmon fry (M74 syndrome).

Two practical methods are reported for treating feral Baltic salmon with thiamine hydrochloride against M74 syndrome (abnormally high yolk-sac fry mortality of the Baltic salmon). Both bathing of the yolk-sac fry in thiamine hydrochloride (1000 mg l-1, 1 h) and a single intraperitoneal injection given to the female brood fish (100 mg kg-1 fish) during the summer 3 mo before stripping were shown to elevate the whole body total thiamine concentration in the fry. Both treatments were also shown to be effective in preventing mortality due to M74 syndrome.

Seasonal changes in certain metabolic and haematologic responses of Salmo gairdneri acutely exposed to dehydroabietic acid (DHAA).

Physiological effects of a high sublethal DHAA exposure on respiration, ammonia excretion and haematology of rainbow trout were studied in July at 15 degrees C and in December at 10 degrees C. In the control fish plasma glucose concentration was higher (P less than 0.001) in December than in July, but plasma protein (P less than 0.

Blood oxygen transport of hypoxic Salmo gairdneri.

The in vivo blood oxygen binding properties of rainbow trout were studied in normoxia and hypoxia (PO2 55-60 mmHg). Owing to hypoxia the in vivo oxygen dissociation curve of blood was shifted to the left; the P50 value decreased from 37 mmHg in normoxia to 27 mmHg in hypoxia. Hypoxia also caused an increase in the erythrocytic volume, a decrease in the concentrations of ATP and hemoglobin inside the cell, and an increase in the intraerythrocytic pH.

Oxygen transfer, gill resistance and structural changes in rainbow trout (Salmo gairdneri, Richardson) gills perfused with vasoactive agents.

1. Gill resistance (Rg) and oxygen transfer (To2) were measured in perfused rainbow trout gills. After perfusion the gills were analysed morphometrically.

Comparison of induced and spontaneous arousals in hibernating hedgehogs.

Respiratory and circulatory differences between periodic spontaneous arousals and induced arousals in hibernating hedgehogs were studied in a constant ambient temperature of + 4.2 +/- 0.5 oC.

The distribution of the hedgehog (Erinaceus europaeus L.) in Finland in 1975.

The distribution of the hedgehog (Erinaceus europaeus L.) in Finland was surveyed in the light of an inquiry. The range presented is based on more than one thousand answers to a questionnaire.

On the [4-14C]progesterone metabolism of keloid and hypertrophic scar. A preliminary report.

Tissue specimens from keloids (K) and hypertrophic scars (H), as well as from the healthy skin in their vicinity (KS resp. HS) were incubated in a medium containing [4-14C]progesterone. The metabolites were isolated and verified with thin layer chromatography.

A technique for repeated sampling of the blood of individual resting fish.

A dorsal cannulation technique is described. It has been employed for repeated blood sampling in unanaesthetized rainbow trout (Salmo gairdneri) kept singly in special receptacles described in the paper. The level of the studied haematological parameters (Haematocrit, Hb, glucose, lactate, K+, Na+, Ca2+) differed between fish kept in receptacles for 1 week and free-swimming fish, most probably owing to differences in the motility of the fish.