Whale watchers should be on the lookout for Chopfin, the transient orca

When the storms clear out and the ocean is again calm and navigable, marine mammal enthusiasts will venture out in search of Pacific gray whales migrating south to Mexico.

What they might encounter, though, are killer whales that have been seen sporadically in recent weeks off Orange County and Los Angeles. These "transient" orcas prey almost exclusively on marine mammals and perhaps are taking advantage of an abundant California sea lion population in the San Pedro Channel.

The most prominent member of this small sub-pod of transients is "Chopfin," who has a severely damaged dorsal fin.

In all, 150 transient killer whales have been photo-cataloged by researchers Alisa Schulman-Janiger and Nancy Black. None is as easily identifiable or as mobile as Chopfin, who is catalogued as CA217.

So if you're heading out anytime soon, definitely keep an eye peeled for Chopfin and his posse.

Scuba divers note: Avalon Harbor Underwater Cleanup day is Feb. 21

Scuba divers fond of Santa Catalina Island and concerned about the cleanliness of the marine environment might wish to mark Feb. 21 on their calendars.

The 28th annual Avalon Harbor Underwater Cleanup has been scheduled for that day -- the only day diving is permitted in Avalon Harbor.

It's become one of the most popular diving events in Southern California; last year 520 participants from various dive clubs showed up to clear the ocean floor of items lost or thrown overboard by careless humans.

Last year the water was murky, though, as the event followed a period of rain and wind. Hopefully, visibility this time will allow a thorough clean up. Cost is $35 per person for those registering online before February. To register or learn more, click here.

Photo courtesy of Catalina Island Conservancy