Aspects of deep sea biology

abundant adult angler-fishes Antarctic arrow-worms bathypelagic Beebe Bermuda biology bottom waters brotulids catch cells cephalopods ceratioid Chauliodus sloani coccolithophores colour Copenhagen copepods creatures crustaceans Dana-Rep deep ocean deep scattering layers deep waters deep-sea fishes deep-sea floor deep-water depths developed diatoms distribution dredging echo-sounding environment euphausiids Expedition eyes fauna feeding female float gelatinous genus gland Gonostoma gonostomatid hatchet-fishes hauls Hjort inches long invertebrates lantern-fishes larvae lateral line lateral line organs length levels light organs living space luminescent luminous macrourids male Mediterranean metres Michael Sars mid-water migrations Murray muscles Myctophidae nets North Atlantic number of species oceanic waters Oceanographic oozes oxygen pattern pelagic peridinians photophores plankton planktonic animals plants Plate populations prawns prey pteropods Radiolaria rat-tails region retina salps sea water siphonophores sound spawning squid Stomias stomiatoid fishes subtropical surface waters swim swim-bladder temperature tissue towed trawl tropical underwater upper vertical water masses