During a 23-d study of Lake Biwa, Japan (starting 23 August 1993), multifrequency inverted echo-sounder measurements of nocturnal scattering layers in the metaand epilimnion were performed at a single location. Direct samples from within this scattering layer indicated that it was composed of Jesogammarus annandulei (Crustacea: Amphipoda), with mean adult length of 8.3 mm and population densiti...

Studies on fish community structure along altitudinal gradients of rivers are lacking in Nepal. This study was carried out to gauge the diversity and composition elevational gradient Ratuwa River. The varies between 70 m 1300 m. Fish samples were collected based habitat representativeness from April (spring) 10-18, July (summer) October (autumn) 2020 January (winter) 2021. A total 3447 specimen...