ML 118106


Common Minke Whale -- Balaenoptera acutorostrata More
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Cole Levenson
5 Mar 1974 at 22:51

  • Bahamas
  • waterbody:North Atlantic OceanGrand Turk Island; U.S. Naval Facility
No locations found with lat/long
  • Mono
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NOTES: Notes on tape: "Time 0351 Zulu 06Mar1974" [MLNS notes: This should be 2251 the previous date. Low level thumps throughout, with several louder thumps interspersed.] Notes from analysis log: "Cassette number side up - rewind. Ambient noise moderate, distant ship traffic. At 730 recorder off & on. Humpback: Pos.; No. Calling: 1; No. Full Calls: N.A. Need for further analysis: No. Notes: at 094 hear a distant hump groan, heard weak in distance off & on thru out recording. Minke: Pos.; No. Heard: 3-4; No. Trains: 20+. Need for further analysis: Yes. At 094 hear a thump train again at 191 both weak. At 207 a moderate level train - at 229 a different one close. At 272 a moderate level train, - at 291 the slow thumper. At 308 a thump train, at 342 a different one, at 379 thump train. At 445 a strong train, - at 496 the slow thumper shows, at 525 a thump train, at 571 different one, thump train strong 595, at 612 a thump train (strong one), at 658 a thump train, at 705 the different one, at 753 a thump train, at 774 another thump train. At 795 the slow thumper (tape ends)." [MLNS notes: last two strong thump trains removed due to recorder cutouts. 16Dec2003 CB]

[Notes from analysis log for all tapes in the GRANDTURKS series: "Six half-hour background recording samples on selected days for a period of 53 days... to detect the arrival and departure of the Humpback whales (via sounds) for the season in the Caribbean Sea, Mouchier, Navidad and Silver Banks...There are indications that recordings used a 420Hz Low Pass Filter. Recording equipment used was a Realistic model CTR-19. Cassette recorder operating on 110VAC, Freq 60-10,000Ha.. The Realistic recorder is poor recording frequencies below 60Hz as evidenced by spec sheet and sonograms. There is 120 & 180Hz electrical interference 'splatter' on some tapes. In certain cases when the ambient is low, the gain of the systems are raised hence we have heavy interference masking wanted signals. This could be caused by a fluorescent light fixture near the recording system? I doubt that it is in the hydrophone pre-amp network." See analysis log for more details.] SEAOCEAN

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