Seasonal dynamics of Hemimysis anomala estimated density (ind. m⁻³) from winter 2021 to summer 2022, based on diving observations of the swarm located in the reference concrete pipe (1.4 m³). Points represent individual observations, distinguished by life stage (blue circles = Juvenile, green triangles = Juvenile or Adult, red squares = Adult) and by absence of individuals (open grey circles, i.e., no mysids detected). The black line and grey shaded area show a loess smoother with its 95% confidence interval. The y-axis is shown on a logarithmic scale. Inset pie charts above each month summarize the proportion of juveniles (J) and adults (A) (weighted by total individuals observed across dives).