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Body length-dependent variability of the 5 following characteristics, commonly regarded as diagnostic, was studied: head length, maximum body depth, interorbital distance, horizontal eye diameter, and snout length. Ray counts in the dorsal, anal, and pectoral fins were analysed. Skeletal bones were described in detail, based on material from 3 individuals. The data obtained served to extend the species description. Functional and evolutionary importance of variability in the characters studied was analysed.

Studies were carried out on morphologic parameters, length-weight relationship, condition, fecundity and food of Psilodraco breviceps - little known benthopelagic fish from the region of South Georgia. Absolute fecundity was within the range 1206-3537. The fish fed mostly on Mysidacea.

The present paper evaluates the relevance of otoliths, vertebrae and other osseous elements to the age determinations; the age composition of stock, growth rate, length-weight relationship, condition, stage of gonads maturity as well as the age at first maturity were investigated, too.

Studies were made on the content of 278 stomachs of Parachaenichthys georgianus from the region of South Georgia and 30 stomachs of Parachaenichthys charcoti from the region of South Shetlands. Small P. georgianus fed mostly on Mysidacea, medium-sized on shrimps and fishes, large specimens on fishes. P. charcoti fed on fishes, Mysidacea and Euphausiacea.