He retired in 1991, became an Emeritus Professor in 1992 and pursued his scientific work at the Station de Biologie Marine in Sète, where he was still active in 2012, aged 89.

He travelled and collected parasites in many countries, including Africa (Senegal, Benin, Cameroon, Mali, Madagascar, Morocco, Tunisia, Algeria), the United States, Mexico, India, Indonesia, French Polynesia and New Caledonia.

[2] Louis Euzet created a school of parasitology named “montpelliéro-perpignanaise” (from both Montpellier and Perpignan, France)[1][4] and his students are now researchers or university professors in many countries.

Among his students who continued a successful career in parasitology were Academician Claude Combes, Guy Oliver, Claude Maillard, Alain Lambert, Antoine Pariselle and Jean-Lou Justine (France), Isaure de Buron (United States), Mohamed Hedi Ktari, Fadhila Mokhtar-Maamouri, Lamia Gargouri, Lobna Boudaya and Lassad Neifar (Tunisia), Nezha Noury-Sraïri (deceased) and Ouafae Berrada-Rkhami (Morocco), Faïza Amine, Nadia Kechemir-Issad and Fadila Tazerouti (Algeria), and Branko M. Radujković (Montenegro).

In 2003, many of his former students and several researchers from all parts of the world happily contributed to a two-volume Festschrift in his honour entitled “Taxonomy, Ecology and Evolution of Metazoan Parasites”.

[5] Louis Euzet's huge collections of parasitic worms, consisting in more than 10,000 fully labelled, stained and mounted specimens of Monogenea and Cestoda on microscope slides prepared by himself, are deposited in the Muséum National d’Histoire Naturelle in Paris.

Genera include Euzetiella de Chambrier, Rego & Vaucher, 1999 (Cestoda), Euzetia Chisholm & Whittington, 2001, Euzetplectanocotyle Mamaev & Tkachuk, 1979 and Euzetrema Combes, 1965 (Monogenea), and Euzetacanthus Golvan & Houin, 1964 (Acanthocephala).