Safety first

Sampling takes lot of courage, because you never know, what can be attached to your CTD when it comes up. Octopuses, for example, are quite a danger, especially above the very deep parts of the Baltic Sea (this drawing was found washed ashore in Kaliningrad, 14 Nov 1873, and was very likely sketched by the last survivor of unknown research vessel).

Since then, for most frequent and dangerous by-catches, standard set of repellents is always near the CTD operator.