as a vertebrate zoologist, feider surrounded himself with other members of the department of zoology, developing several lines of research for each of them, mentoring them to successfully defending their ph.d. theses. all those collaborators – libertina solomon, viorica simionescu, iulia mironescu, nicolai valenciuc, and iordache ion became full professors and accomplished researchers. some of their joint lines of research topics were “the hyoid-mandibular apparatus in fishes” and “the relative growth in some fish species”. the work was done at the “marine biological station professor doctor ioan borcea", agigea, romania, founded in 1926 at the border of the black sea, as an external research institution pertaining to the alexandru ioan cuza university, iași.