Knowledge of deep-sea reproductive biology is slight and interpretations of reproductive strategies in deepsea
fishes are controversial. Since the Mediterranean is a fairly stable and constant sea, we might expect a consistent pattern
of reproduction of deep-sea species. Three gadiforms species with a succesive bathymetric and an ecological and economical
importance in the Mediterranean fishing industry, Phycis blennoides, Mora moro and Lepidion lepidion, were selected
for the present study. These three species of gadiforms are sexually dimorphic and their reproductive population is located
at the lower zone of their bathymetric range. Females were always bigger than males. The smallest mature male was
observed at 19, 32 and 18 cm TL (total length) and the smallest mature female at 20, 34 and 20 cm TL for P. blennoides,
M. moro and L. lepidion respectively. The three species are iteroparous and females could be all-at-once or batch-spawners.
An autumn mature season was observed for P. blennoides, whereas M. moro and L. lepidion had mature individuals all year
round except in summer. Hence, physical constancy at greater depths is able to lengthen the reproductive season and the
deepest species has a quasi-continuous reproductive pattern. Similar reproductive tissues have been found in the three
species studied, and they show analogous structure with other deep-sea gadiforms and their shallow-water congeners.
Key words: biology, reproduction, gadiform, deep-sea, Mediterranean.