Biological Dredge

Station: Rock Pile
Date: 3/11/2017, 1:43 PM
Conditions: 70° F, foggy, winds S 5 mph
Latitude: 33° 40' 21" to 33° 40' 19" N
Longitude: 118° 13' 44" to 118° 13' 27" W

Sediment Desc: Gravel to boulder sized rocks (siltstones)
Flora & Fauna:

Common Name Scientific Name Total Captured Method of Take Disposition
Common Sea Star unknown 7 biodredge released
whelk - Kellet's Kelletia kelletii 4 biodredge released
Urchin - white unknown 3 biodredge released
Sea Stars - brittle unknown 3 biodredge released
Urchin - heart unknown 2 biodredge released
crabs - hermit unknown 2 biodredge released
whelk - Knobbed  Busycon carica 2 biodredge released
Stalked Tunicate Boltenia ovifera 2 biodredge released
Snails - Cowrie Neobernaya spadicea 1 biodredge released
crabs - Rock unknown 1 biodredge released
Bat Star Asterina miniata 1 biodredge released
Clams -  unknown 1 biodredge released
Sponge unknown 1 biodredge released
Sand-rose anemone (?) Urticina columbiana 1 biodredge released


Kelp does not put down roots in the sediments on the seafloor. Instead, it anchors itself onto rocks. Many organisms make these rocks their own. The area on the San Pedro shelf called the "Rock Pile" is where the coastline used to be 10,000 years ago. As the planet warmed and the ice sheets melted, sealevels rose, covering this rocky coastline with seawater.

Below are some pictures of the organisms we collected during this biodredge. All creatures were returned to the ocean.