Hello and thanks again for your answers and interest. I'll try to address and clarify all the issues below:
RE: Marie Roch >I would begin by not using MP3 recordings We're recording AIFF or WAV files, 24bit 48KHz, the linked file was compressed in mp3 for practical purposes. RE: Jerome Sueur / Corixidae It was in a small artificial(?) lake/pond, quite shallow, during summertime in Switzerland. RE: justin.halls >A cautionary tale Unfortunately I don't have access to that document... Should I take this "cautionary" advice as a warning? Could we be attacked by those insects? (just kidding, but curious about the "cautionary"). RE: Stim Wilcox >But I can't hear them on my computer, alas, though the sound track shows. Are you referring to my link? Did you try control+click "save link as..." ? RE: Braulio León >What I would recomend first is a little of research about what animal you >can find in those lakes and ponds, because the equipment you need will >depend of what band of frequencies you want to record. You cannot always >expect to find the same animals, as well the same sounds. It is not only a >equipment problem, it will depend on what season you are recording, the >size of the pond or the lake that may change the biological parameters and >at the same time the type of sounds you could get. Well, we don't know what to expect, and weren't looking for anything in particular - we "just" want to aurally observe any underwater organic sound activity we may find in lakes, ponds and rivers in Europe and central Russia from 35°N latitude upwards. So, probably aquatic insects and, I can imagine, some fishes... About fishes: what could we expect to hear in terms of species and of types of sounds (= freq. range)? If I'm not wrong, that should be below 10KHz - so to reiterate my question: would any relatively low-cost 48V electrostatic hydrophone do the job? We'd love a Brüel/Kjaer hydrophone (we have some B&K/DPA mics so we could imagine that with one of those...) but that's out of our budget now... The recording device is a Tascam DR-100, sometimes a Sound Devices 722, file format is WAV, 48KHz, 24bits. Kind regards! Gianluca
