ML 117892


Common Minke Whale -- Balaenoptera acutorostrata More
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Cole Levenson
3 Jan 1974 at 07:00

  • Bahamas
  • waterbody:North Atlantic OceanGrand Turk Island; U.S. Naval Facility
No locations found with lat/long
  • Mono
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NOTES: Notes from tape: "time: 1200 Zulu." [MLNS notes: low level thumps throughout, with several louder trains - at 1:41, 6:42, 9:37, 16:53, 17:42, 25:45.] Notes from analysis log: "Cassette number side up - rewind. Ambient level moderate - distant ship traffic. Humpback: Neg.; Minke: Pos.; No. Heard: 2 or 3; No. Trains: 9. Need for further analysis: Yes - see if 3 can be differentiated. Notes: At 069 a mod. level thump train, at 227 again at 304. At 467 a distant thumper, very weak. At 475 a closer mod. level thump train, at 492 a different stronger one, - maybe 3. a weak one starting at 561, at 593 a weak one. At 649 the strong one. At 661- for sure this one twice has started just after. At 727 a crack sound (not multipulse) made gramm to see." [MLNS notes: two 'crack' sounds: at 26:53 and 30:07.]

[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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