Marine life behavior
Bonaire, 2009 – Hatching jawfish eggs! A male jawfish has guarded these eggs in his mouth for close to a week, and we managed to photograph and video them hatching. It only took fifteen years to get the shot! We fell in love with jawfish in 1995 in Bimini. The first magazine article that Ned and I wrote together for Ocean Realm magazine was about Yellowhead Jawfish, Opistognathus aurifrons (a link to a scanned copy of the 1995 article is … Read more
Here is your dose of fishy cuteness: The Signal Goby, a.k.a., Crabeye Goby, a.k.a., Twinspot Goby. Not only fun to watch, this fish has some pretty curious reproductive behavior, as we learned a few years ago. Signigobius biocellatus feeds by sand-sifting so we find them just off reefs or near shorelines in silty, nutrient-rich sand. We have seen them from Palau through Indonesia, so they aren’t really rare, but their populations are certainly not dense. Almost always found in pairs, … Read more
And a double take is just what I did when the big round eyes of this Shorthead Blenny rolled onto Ned’s laptop screen. Something wasn’t quite right with the picture so I took a second look and the image fell into place: The tiny blenny’s googly eyes were rotated backwards staring directly behind the fish’s head at Ned’s approaching camera port—a vision of visual dexterity that would make any blenny lover proud. Ned’s preoccupation with backward focused blenny eyes began … Read more
April 2013 – A nudibranch eating nudibranch – this one gives me the heebie jeebies. I know many divers who go crazy over nudibranchs the way we go crazy for blennies. Nudibranchs belong to the phylum Mollusca and share a subclass, Opisthobranchia, commonly called sea slugs. Many are beautifully colored and some are very cryptic, mimicking the things they feed upon, like coral or sponges. Brightly colored nudibranchs really stand out to us in the muck or rubble bottoms that … Read more
Ever since I attended REEF’s free online Fishinar about hamlets, presented by talented instructor/photographer Jonathan Lavan (his Underpressure photo blog ) I’ve intended to read up on the latest about hamlets. They are one of my other favorite groups of fishes (it’s not always about blennies) so I thought I’d share. Hamlets are a genus of small reef fish in the seabass family Serranidae found in western Atlantic, Caribbean and Gulf of Mexico waters. The first time we ever saw … Read more
Universal Truth of Blenny Watching #1: The desirability of the blenny is inversely proportional to the conditions in which one must dive to see/photograph it. Longhorn Blenny? High on our list and took two 90-minute dives in surge to get the shots (see last year’s post here). A blenny with eggs? Seaweed blennies are pretty common in Florida, but the Seaweed Blenny with eggs was in 72-degree water with 3-foot visibility (see that post here). So why would I even … Read more
March 2013, Halmahera, Indonesia ~ Oh no! Right before my eyes, my beloved benthic ctenophores, so delicate and colorful, have metamorphosed from gentle plankton netters to smothering killers of fishes and crabs! Drifting over a black rubble slope off Makian, our guide Yann Alfian points out a ctenophore-covered starfish. During our October trip around Batanta aboard the Dewi Nusantara, Yann asked me why I was spending so much time looking at these things on the starfish. I explained that these … Read more
April 2013, Halmahera, Indonesia ~ More soft coral mimics! Back in November, I posted a video of a nudibranch, Phyllodesmium rudmani, that mimics the soft coral, Xenia, upon which it feeds (click here to see the previous post). Ned wasn’t with me on that dive so last month, during our cruise through Halmahera aboard the Dewi Nusantara, our guide Yann made sure Ned saw this different species of nudibranch, which I think is Phyllodesmium jakobsenae, another predator of soft coral. … Read more
March 2013 – Waigeo, Indonesia In October 2012, I found a tiny fish that I couldn’t identify. It was wary, darting into a small hole when I got too close. I shot video, noted the location and on the afternoon dive, navigated back to it so Ned and several others could take photographs. Back on the boat we decided, based on its body shape and distinctive dorsal fin that it had to be a juvenile Doublebanded Soapfish (Diploprion bifasciatum). Other … Read more
I love the way Harlequin Shrimp move – their little abdomens waggle – like bobbleheads in reverse – bobblebutts! And the “wax on – wax off” movement with their claws – too cute! However, once you get past their looks, it gets a little gruesome because Harlequin Shrimp are voracious predators of starfish. I say gruesome because they don’t put a quick kill on them. No, they flip the starfish over so it can’t walk away then proceed to consume … Read more