Underwater trapping of insects on light

560 specimens of adult individuals of invertebrates and their larvae have been caught for four nights, from May 6th till May 10th of 1995, with an aid of the underwater light trap of the original construction. Representatives of the order Coleoptera, families Haliplidae (104 ind.) and Dytiscidae (47 ind.), as well as crustaceans: Daphniidae (256 ind.) and Cyclopidae (89 ind.) dominated in the collection.