International Journal of Limnology

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.

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 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.