Biodredge

Station: Biodredge / San Pedro Shelf (Rock Pile)
Date: 12/02/17, 9:36 am
Conditions: 67°F, sunny
Start: 33° 40' 21" N, 118° 13' 32" W
End:   33° 40' 31" N, 118° 13' 19" W

We use a method called "Otter Trawling" or Midwater Trawling to collect pelagic (swimming) organisms. "Otter" refers to the rectangular boards on the net. Hydrodynamic forces act on the boards, keeping them apart and the net open.

All organisms were returned to the ocean

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  • Holdfast
  • Asphalt naturally seeps onto the seafloor, forming chunks like this one.
  • Crab
  • Sand Dollars
  • Bat Star
  • Sand Star (top)
  • Sand Star (bottom)
  • Heart Urchin
  • White Urchin
  • White Urchin
  • Kellet's Whelk (top)
  • Kellet's Whelk (bottom)