Nudibranch Facts, by the Numbers

THERE ARE TWO KINDS OF DIVERS: THOSE WHO ARE BONKERS ABOUT NUDIBRANCHS and those who ought to be. For those in the second category, here are some nudibranch facts. First, as the name “nudibranch” suggests – it’s from the Greek for “naked gills” – nudibranchs absorb their oxygen from the water through external breathing structures located on their backs. There’s great variation in gill architecture among the many species of nudibranchs, from flamboyant to demure. And

Read more

Manta Ray Facts, by the Numbers

1)  THERE ARE TWO SPECIES OF MANTA RAYS – OCEAN MANTAS (MANTA BIROSTRIS) AND REEF MANTAS (MANTA ALFREDI). M. birostris is also sometimes known by the names giant ocean manta and Atlantic giant manta. Mantas are the largest members of the ray family and among the largest fishes in the sea. 2) Oceanic mantas are found worldwide, often reported as swimming great distances across oceans. They generally prefer tropical and subtropical waters. 3) Reef mantas are

Read more

How to Treat Stings: Jellyfish & Fire Coral

  LET’S TALK ABOUT HOW TO TREAT STINGS. My front page post, “Nematocysts and the Science of Sting,” discusses the way jellyfish, fire coral and other cnidarians bring about their painful stings. On dive boats, in dive shops and, of course, on the internet there are lots of theories about how to treat stings by cnidarians – most of it more urban legend than factual. Here are some facts, culled from medical resources. THINGS YOU SHOULDN’T

Read more
how cuttlefish hunt

How Cuttlefish Hunt – an Awesome Video

THE FIRST REASON FOR WATCHING THIS VIDEO OF A FLAMBOYANT CUTTLEFISH stalking a shrimp is that it’s a fascinating view of how cuttlefish hunt and capture their prey. The second  is that it’s a flamboyant cuttlefish – that’s its street name – an astoundingly dramatic, colorful creature described as the “flamenco dancer of the cuttlefish world” by the Monterrey Bay Aquarium (MBA), which produced the video. A FRONT-PAGE FEATURE SIDEBAR I get into the characteristics and

Read more