1. On the mating aggregation of Ragged Sea Hares (Bursatella leachii) in Mandahl Bay Lagoon, St. Thomas, Virgin Islands.

    # vimeo.com/280888522 Uploaded
  2. Possible Bursatella leachii (Ragged Sea Hare) mating aggregation in Mandahl Bay Lagoon [Google Map: 18.360023, -64.894594].

    FILMED OBSERVATION PERIOD: 1:30am - 2:30am AST, July 11, 2018.
    Visual no-touch identification of sea hares subject to verification. Individuals seemed to be young adults/late adolescents ranging in size from 1.5 inches to three inches.

    Lighting: 50 lumens, 5000k led diffused with 6 1/2 inch diameter flat plate. {Light was kept as low as possible to avoid adverse effects on nightlife. As a result, some graininess and focus issues exist in parts of the video. This lower-grade footage was left in place to maintain the consistency of the observation. Additionally, larger patches of mating sea hares that were visible to the human eye, did not render on camera (black frames) and those segments have been deleted.)

    Camera: LG cell phone
    Water depth: Sea level to 4 inches
    Tide: Low
    Water Turbidity: Low
    Water Visibility: 18 inches
    Water type: Brackish, Mangrove Roots (tanic acid)
    Water Temp: Unknown
    Air Temp: 78f
    Humidity: (Not measured on site. Averaged from regional NOAA Climatological Report (Daily) preliminary data - 70%)
    Wind: East (110), Intermittent, light to moderate gusts (to 10 knots), mostly calm.
    Sky Cover: Light cumulus cloud patches

    Video highlights:
    00:00 - 00:30 Yellow-crowned Night Heron with hermit crab in beak runs about in front of headlights of car entering Mandahl Bay.

    00:31 - First sea hare sightings ... individuals stranded on sand by retreating tide. Juvenile fish.

    01:16 - Possible juvenile Sphoeroides testudineus (Checkered Puffer) ??? (Positive ID of juvenile fish can be extremely tricky using no-touch observation methods. Collection and microscopic analysis is typically required for confirmation).

    01:53 - First encounter with active sea hare. 2 inches of water. Within 20 minutes, the sand was covered with sea hares. Dorsal respiration and excreting activity visible.

    03:31 Small hermit crab passes sea hare. Sea hare obviously responds to crab's proximity.

    Throughout: Unidentifiable juvenile fish, various shrimp, other swift moving water life

    06:34 - Lighting angle and water depth optimal for best video detail and close up of sea hares. (4 inches depth). 6 1/2 in. diameter flat diffusion plate added to light to eliminate minor spotlighting.

    08:00 - First mating contact of sea hares

    16:55 - Attempt to get to denser patches of sea hares, not enough light to penetrate lagoon water.

    17:03 - Fiddler Crab ???

    18:21 - Tide stranded Cassiopea xamachana (Mangrove Upsidedown Jelly) Visual no-touch ID notes longer arm length and greater symmetry of white markings than C. frondosa (Upsidedown Jelly)

    19:06 - Sea hares among unidentified lagoon plants. No obvious signs of egg strings. Will require followup observation. individuals appear younger and smaller than those in sand.

    22:51 - { Middle Salt Pond beach area} Adult Sphoeroides testudineus (Checkered Puffer)

    24:11 - Needlefish chases fish, appears distracted by light - Suspected Tylosurus crocodilus (T. Acus [agujon] also present in region). Identity inconclusive from dorsal view. T. crocodilus suspected because: Beak short compared to other needlefishes, dorsal fin begins set back from anal fin, known to adapt a darker blue/black/purple dorsal coloration when stalking prey close to sandy bottoms however bluish coloration may also be due to camera lighting refracting off the silvery scales.

    25:10 - Sea hares washed ashore on salt pond beach plus various juvenile fish and shrimp to conclusion.

    # vimeo.com/279828833 Uploaded
  3. The Summer Solstice aerial survey of the Mandahl Bay APC Wilderness Preserve Eco-system is part of the Mandahl Bay APC Wilderness Preserve Aerial Eco-System Survey. These survey flights are conducted on the solstices and equinoxes to map seasonal and annual changes to the area Eco-system. Video taken at mid day, June 21, 2017, by Danet Operations Group. All rights reserved.

    # vimeo.com/228752055 Uploaded
  4. 360 Shallows Cam (270 degree field of view), Mandahl Bay APC Wilderness Preserve

    # vimeo.com/228568786 Uploaded
  5. In 2008 the Virgin Islands population was surprised to learn of plans to develop the Mandahl Bay Beach, Salt Pond and lagoon into a large scale luxury hotel and marina. Matters proceeded to public hearings before the V.I. Coastal Zone Management (CZM) Board in spite of two V.I. laws specifically prohibiting negotiations for the property that exceed the deed restrictions. By diverting the 23+ acre shoreline rent of $500 a month for 99 years to the College of the Virgin Islands (now University), it was argued that a hotel/marina has an environmentally educational purpose.

    This musical slide show of life presence at Mandahl Bay is the first DVD of the Save Mandahl Bay series. It was created at the spur of the moment by Karl Callwood from archived observations after an "Alternative Facts" statement was made by Developer's representatives on a radio talk show.

    The statement was: There is no significant life present that will be detrimentally affected by a resort and marina.

    This slideshow challenged that statement and was originally intended to run on-screen during our opposition testimony at the 2009 hearings. Thus it is a musical presentation with no associated vocals attached. The images were captured by Karl and Johnathon Callwood between 2006 and 2008.

    JUST A FEW DECADES AGO, THE BROWN PELICAN WAS ALMOST EXTINCT DUE TO PESTICIDE POISONING.
    The first portion of the presentation is quite heavy with Brown pelican images. At the time, the Brown pelican had recently been removed from protected status and pesticide-free Eco-systems such as Mandahl played a role in the species' re-population. The sheer density of migratory pelican roosting and feeding was presented as an important argument against disturbing Mandahl.

    A re-mastered version with wording will be released in a few months. For historical purposes we thought you'd enjoy viewing this original as well.

    # vimeo.com/201009216 Uploaded

Mandahl Bay

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