Abstract
The originality of the device described depends on the scanning of the experimental tank by sensors, which facilitates the high sensivity required to distinguish small animals (≈ 2 mm long) and the use of a large tank (containing ≈ 30 1 of sea water and measuring 90 cm high). Consequently, prolonged observations of both swimming and spatio-temporal distribution are possible simultaneously. The cylindrical and transparent experimental tank is isolated inside an enclosure where both temperature and light are either regulated, respectively, to a constant level or varied periodically according to a large range of schemes. The tested animals are detected by infrared barriers set on a ring frame constantly scanning the whole height of the tank. The processing of photocurrent signal gives out-put impulses which are simultaneously recorded on a sequential printing counter and on a plotting chart recorder. This recorder produces an analogic actotaxigram which also gives the temperature and light diagrams.To give an example of possibilities of this appliance, two experiments have been made on mysid shrimps (Leptomysis lingvura G.O. Sars).
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