Abstract
In the mid North Atlantic Chauliodus sloani is caught mainly between 55° and 29° N, while the majority is caught north of 35° N. The greatest density is found around 40° N. Chauliodus danae has the northern limit of its distribution at about 45° N. C. danae, in particular the smaller specimens, shows clear vertical migration and has food preference, while C. sloani does not show such migration and is most probably a random feeder. In both species there is a significant increase in length from south to north.
Highlights
When the seasonal variations in density of animals (Ciooo) are considered there is a striking difference between C. sloani and C. danae
For C. danae the distribution found in the mid North Atlantic is completely different
Marshall (1979) developed a theory to explain this difference in maximum length
Summary
(134 mm) (Regan & Trewavas, 1929; Ege, 1948; Koefoed, 1956; Morrow, 1961, 1964; Marshall, 1979; present study). Analysing the Dana material, Ege (1948) found that in the mid Atlantic C. sloani is fairly common at 45 °N and that all positive records are north of 40°N, while the northernmost catches were at 56°N. He relates the northern border of C. danae to the 15°C isotherm (at depths of about 150 m), as most specimens are caught south of it. This means that the northern border for C. danae is at about 40°N
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