Biological Dredge

Station: Rock Pile
Date: 110/13/2018, 9:15 AM
Conditions: 65°C, light rain
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
Pacific Red Octopus Octopus rubescens 1 biodredge released
Hydroid Feathers unknown 10 biodredge released
Sea Stars - brittle star unknown 3 biodredge released
Sea Star - Common Sea Star unknown 5 biodredge released
Stalked Tunicate Boltenia ovifera 2 biodredge released
Urchin - white unknown 13 biodredge released
Kelp - Turkish Towel Chondracanthus exasperatus 10 biodredge released
Kelp - Southern Sea Palm Eisenia arborea 14 biodredge released
Kelp - Red Dendraster excentricus 20+ biodredge released
Rock Crab Cancer antennarius (?) 2 biodredge released
whelk - Kellet's Kelletia kelletii 2 biodredge released
Snails - Cone unknown 1 biodredge released
Snails - Wentaltraps unknown 4 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.