This essay explores the multifaceted personality of Raymond Rouch, a French scientist who contributed to the development of modern groundwater ecology, an area of research combining limnology and hydrogeology. As a widely cultured humanist and talented painter who left his mark on modern art, Rouch is a unique example of the successful combination of scientific creativity and artistic pursuits.

Vegetated shallow habitats strongly influenced macroinvertebrate diversity in Lago Menor, Lake Titicaca. Depth, macrophyte biomass, and seasonal hydrology shaped community structure. These findings improve understanding of biodiversity patterns in high-altitude tropical freshwater ecosystems.

This study presents a smart aquaponics system that integrates Internet of Things (IoT) monitoring with evolutionary optimization methods like Genetic Algorithm, Simulated Annealing, and Particle Swarm Optimization to regulate pH, temperature, and total dissolved solids. The approach improves plant growth, strengthens system stability, and supports sustainable freshwater food production.

Hypselobarbuskurali(Red-tailed Barb)is a commercially important food fish that is endemic to the Western Ghats biodiversity hotspot. The estimated growth parameters of H. kurali include an asymptotic length (L∞) ranging between 263.55 and 368.55 mm and growth coefficient (K) varying from 0.42 and 0.82 yr-1 across different rivers. The fishing mortality rate observed for H. kurali in the Periyar River of 1.37 yr^-1 seems to be among the highest ever documented for this species. The current exploitation rate (E), which varies from 0.44 to 0.63 yr^-1, slightly exceeding the optimum exploitation level (E=0.47) in two rivers and strongly exceeding in one river. It indicates that unmanaged fishery may have resulted in unsustainable exploitation, making this cyprinid population in Western Ghats rivers at risk of an imminent collapse.

We report the first record of a seventh -and first non-native- minnow species occurring in France, the Italian minnow Phoxinus lumaireul, according to a picture of a male specimen in nuptial colouration corresponding to what observed in the Po catchment, and caught in the Lake Geneva in 2010.

Winter swarms of the invasive mysid Hemimysis anomala in Lake Geneva arise from successive demographic and ecological processes. Adult-juvenile succession supports a reproductive role, while water temperature indirectly drives swarm collapse, partly mediated by the littoral return of perch, with active predation observedby video.

We investigated how phytoplankton, epiphyton, and epipelon respond to short-term nutrient enrichment and its interruption in a mesocosm experiment in a mesotrophic shallow lake. Enrichment increased phytoplankton biomass but reduced epiphyton and had little effect on epipelon. After stopping enrichment, phytoplankton declined while epipelon increased. Enrichment also altered community structure, favoring bloom-forming and shade-adapted species. The nutrient enrichment associated with phytoplankton blooms can compromise periphyton function by reducing biomass, diversity, and altering species composition in shallow lake ecosystems.

The Peruća Reservoir in Croatia faces water quality fluctuations due to rapid recharge and climate change. A hybrid GNN-Transformer model accurately predicts water quality parameters (R² > 0.92), outperforming other models. Climate projections for 2050 suggest declining reservoir levels and water quality, aiding sustainable management.

We present Diat.barcode v12, an updated and expert-curated diatom reference library that incorporates newly published rbcL sequences annotated with ecological and biological traits. Using 320 river samples from France and French Guyana, we show that direct trait assignment can complement taxonomy by providing ecological interpretability in regions with limited taxonomic coverage, supporting the use of traits as an additional tool for biomonitoring.

This study integrated years of field measurements and Landsat-5/8 images to assess the water quality of a typical transport lake in China and revealed the increasing risk of water quality deterioration in recent years. The exploration of population and local fishery size were found to be mainly responsible for the deterioration of water quality.