Complementarity of two high-resolution spatiotemporal methods (hydroacoustics and acoustic telemetry) for assessing fish distribution in a reservoir

Abstract

The complementarity of two high-resolution spatiotemporal acoustic methods, telemetry and hydroacoustics, was evaluated during the same time window to obtain fish distribution in a canyon-shaped reservoir, the Bariousses Reservoir (France). These methods act at an individual scale for telemetry and a community scale for hydroacoustics. The temporal scales are also different: telemetry offers continuous and long-term monitoring while a “snapshot” view is given by hydroacoustics. Day and night hydroacoustic surveys were carried out in this reservoir, during a 24-hour period in spring, using vertical and near-surface horizontal beaming. During this time window, 11 adult fish (length: 22–57 cm) from three species (roach, perch, and pikeperch) were tracked by telemetry. Four metrics were calculated with data collected by application of the two methods: distance to the nearest bank, distance to the tributary, fish depth, and bottom depth at the location. The contrasting (distance to the nearest bank, bottom depth) or partially similar results (distance to the tributary, fish depth) can be explained by the limitations associated with each method. The results obtained with telemetry are very sensitive to the species composition and the size of the tagged fish. The number of fish located in the epibenthic areas of the reservoir can be underestimated by hydroacoustics. This preliminary case study highlights that these methods act in a complementary way and their simultaneous use can provide better information on fish spatial distribution.

Habitat partitioning among three predatory fish in a temperate reservoir

“…Whereas seasonal patterns of habitat use seem to be essentially associated with avoiding unfavourable physical conditions (Lucas & Baras, 2001) and with finding favourable spawning sites (Eckmann & Imbrock, 1996) or prey (Huuskonen et al, 2019), diel movements are generally interpreted as a trade‐off between foraging and predator avoidance behaviour (Lucas & Baras, 2001). In general, small prey fishes in lakes escape predators by finding refuge in littoral shelters during daytime and moving offshore at night (Kubečka, 1993; Riha et al, 2015), which also seemed to be the case in the Bariousses reservoir (Goulon et al, 2018). We could have expected that these prey migrations would drive movements of piscivorous pike and perch.…”

Underwater drones reveal different fish community structures on the steep slopes of a tropical reservoir

“…Different methods have been used to determine the vertical distribution of fish in reservoirs, such as gillnets positioned in different layers of the water column (Prchalová et al, 2008 ), telemetry (Goulon et al, 2018 ), environmental DNA ( Blabolil et al, 2021 ) and hydroacoustic (Busch & Mehner, 2009 ; Pollom & Rose, 2016 ). These methods allow important advances in aquatic ecology, but like any tool, they possess certain biases and limitations.…”