Biological Dredge

Station: Rock Pile
Date: 3/17/2018, 1:56 PM
Conditions: 57°C, sunny, no clouds, winds WSW 13 mph
Latitude: 33° 40' 34" to 33° 40' 30" N
Longitude: 118° 13' 35" to 118° 13' 23" W

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

Common Name Scientific Name Total Captured Method of Take Disposition
Hydroid Feathers unknown 5 biodredge released
Sea Stars - brittle star unknown 8 biodredge released
Sea Star - Common Sea Star unknown 1 biodredge released
Stalked Tunicate Boltenia ovifera 1 biodredge released
Urchin - white unknown 5 biodredge released
coral - cup unknown 20 biodredge released
Kelp - Turkish Towel Chondracanthus exasperatus 10 biodredge released
Sand dollar Dendraster excentricus 3 biodredge released
Sponge unknown 1 biodredge released
whelk - Kellet's Kelletia kelletii 2 biodredge released
Algae - Coraline Red Calliarthron cheilosporioides 20 biodredge released
Snails - Wentaltraps unknown 2 biodredge released
Chiton unknown 1 biodredge released
Shrimp unknown 1 biodredge released
Salp unknown 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.