Brief results of Chionobathyschus dewitti researches which based on data collected from by-catch of bottom longlines at Dissostichus mawsoni fisheries are presented. It is noted that the depths where Dissostichus mawsoni fishery is carried out are inhabited by adult specimens of Chionobathyschus dewitti, aged from 5 to 13. The characteristic feature of Chionobathyschus dewitti reproductive biology was ascertained: ability of females to bear deposits of eggs on ventral fin.
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