This study deals with temporal variations in eel Anguilla anguilla diet, sampled seasonally inthe Languedocian Mauguio lagoon (Gulf of Lion), from Autumn 1998 to Summer 1999. Eel mainlyfeeds on benthic organisms, primarily small Amphipoda, Crustacea (mainly Gammarus gr. locusta),Polychaeta, insect larvae (Chironomidae) and small fish. Based on variations in the eels feedingregime, seasonal influence is illustrated by decreased feeding activity in summer, which progressivelyincreases during the following seasons. The trophic quality available to eels in the Mauguiolagoon depends more on allochtonous inputs from the catchment area than on its own hydrodynamicson which water of marine origin has little influence due to its long distance from the sea.Variations observed during the four seasons illustrate the opportunist type feeding behaviour ofeels. They consume the most available benthic preys at a given moment without using a particularfeeding strategy like specialisation or generalisation. Eel adapts its diet according to the availableresources offered by the ecosystem. Because of this eel, as an amphihaline migrant species, can becharacterised as an obvious indirect bioindicator of the trophic capacity and very marked level ofconfinement in the brackish lagoon ecosystem of Mauguio.U ovom radu se raspravlja o vremenskim kolebanjima u prehrani jegulje Anguilla anguilla, koja je uzorkovana sezonski u laguni Mauguio pokrajine Languedoc u Lionskom zaljevu, od jeseni 1998. do ljeta 1999. Jegulja se hrani bentoskim pridnenim organizmima, i to pretežito manjim rakušcima (poglavito Gammarus gr. locusta), mnogočetinašima, larvama insekata (Chironomidae) i manjim ribama. Temeljem varijacija u prehrambenom režimu jegulje sezonski utjecaj pokazuje da hranidbena aktivnost opada u ljeto, dok progresivno raste u ostalim godišnjim dobima. Trofička kvaliteta dostupna jeguljama u laguni Mauguio ovisi više o alohtonom unosu iz slivnog područja nego o vlastitoj hidrodinamici na koju morska voda ima malo utjecaja zbog njenog dugog miješanja s morem. Zapažena kolebanja tijekom četiri godišnja doba ukazuju na oportunistički tip prehrambenog ponašanja jegulje. Ona se hrani najdostupnijim bentoskim organizmima u datom trenutku bez ikakve prehrambene strategije kao što je su to specijalizirana ili generalizirana prehrambena strategija. Jegulje prilagođavaju svoju prehranu prema dostupnoj hrani unutar ekosustava. Stoga se jegulja kao migracijska vrsta može biti okarakterizirana kao očiti indirektni bioindikator trofičkog kapaciteta i vrlo značajnog nivoa ograničenja u ekosustavu bočate lagune Mauguio
