General

Encyclopedia of Life for BCs humpbacks and Northern Resident Killer Whales

Species at risk in BC

Marine Mammals

Whales, Dolphins and Porpoises of British Columbia, Canada (DFO publication)

BC Cetacean Sightings Network species information; includes turtle IDs

Marine Invertebrates, Fish, Algae
Oceanlink - online B.C. intertidal field guide from Bamfield Research Station

Emerald Diving - species information for the Pacific Northwest
Sea Slug Forum - the one stop for all your nudibranch queries!

National Geographic’s photos of sea slugs.
Nudipixel - more nudibranch IDs.
Fishbase - best resource for IDs of fishes.
Larvalbase - identification of fish larva
Enature  - on line field guide
British Columbia Creature Page 
British Columbia Seashell Page
Man and Mollusc - many links to mollusc resources
Shorekeepers Guide to Monitoring Intertidal Habitats in Canada’s Pacific Waters – good identification guide of organisms - divided by phylum   
Georgia Strait’s intertidal zone species quick list
Seaweeds (field guide is for Alaska but we have many of the same species)

E-fauna - Electronic atlas of the fauna of British Columbia