CHAPTER 13
EUPHAUSIIDS IN THE MARINE ECONOMY
It is now time to examine the importance of euphausiids in the
general economy of the oceans. This cannot, as yet, be done in a very
definite manner because of the lack of quantitative data in many
geographical and scientific areas of investigation. There are, however,
many lines of thought that can be supported by facts but it must be
remembered that many of the problems discussed in this chapter are
of general ecological importance and, because of their complicated
nature, much further work is required to elucidate the mechanisms
involved and their significance in the general marine economy.
The predators of euphausiids are listed in Chapter 12 and a list of
species of euphausiids important in the marine economy emerges :
North Atlantic :
Nyctiphanes couchii.
Around South Africa :
Meganyctiphanes norvegica; Thysanoessa raschii, T . inermis;
Occasionally Nematoscelis megalops.
Nyctiphanes capensis.
Occasionally Euphausia rccurva, E . lucens; Thysanoessa gregaria.
North Pacific :
T . inspinata, T . raschii, T . spinifera.
Western Australia to New Zealand :
Euphausia paciJica, E . similis; Thysanozssa inermis, T . longipesl
Pseudeuphausia latifrons; Nyctiphanes australis.
Occasionally Euphausia recurva, E . hemigibba, E . spinifera;
Thysanoessa gregaria; Nematoscelis megalops.
Indian Ocean :
Pseudeuphausia latifrons.
Antarctic :
&sa macr ura .
Euphausia superba, E . crystallorophias, E. vallentini; Thysano374