Effects of adaptation to different salinities on the lipids of various tissues in sea dace (Dicentrarchus labrax pisces).

1. Effects of adaptation to four salinities (4, 18, 36 and 40 per 1000) have been studied in the main lipidic constituents (triglycerides, phospholipids, free fatty acids, cholesterol, triglyceride fatty acids) of the liver, muscle and intestinal tissue of Dicentrarchus labrax--a euryhaline fish. 2.

[Effects of a rise in ambient temperature on the metabolism of vitamin A in the rat during growth. Studied by measurements in the liver and plasma].

In growing rats, an increase in ambient temperature from 25 to 34 degrees C decreased the level of vitamin A by 54% in plasma and 17% in the liver. But the quantity of vitamin A available for the organism (quantity per gram body weight) remained unchanged. Various hypotheses have been formulated with a view to further research.

[Influence of some nutritional factors on the canthaxanthine pigmentation of the rainbow trout].

The present investigation was made to approve nutritionnal factors which affect the utilisation of food canthaxanthin by hatchery trout. Rainbow trout were obtained from a commercial trout farm, kept in running water and feeding in experimental pellets for 4 to 8 weeks. Five diets were tested (1-standard [7.

[Influence exerced by the season on the modifications of lipid metabolism induced by an increase of the ambiant temperature in the rat].

A fast increase of 10 degrees C (from 24 degrees C up to 34 degrees C) of the ambient temperature alters the male rat lipid metabolism differently if the experiment takes place in autumn or in spring. Generally to this change of temperature, the rat seems to react more in spring than in autumn.