Source: https://www.researchgate.net/profile/Jean-Guillard/publication/250869651_Les_techniques_d'etude_de_I'ichtyofaune_lacustre_utilisee_en_France_bilan_et_perspectives/links/53d270da0cf220632f3c9b4b/Les-techniques-detude-de-Iichtyofaune-lacustre-utilisee-en-France-bilan-et-perspectives.pdf