The Marine Detective

Manta Ray Magic – Fiji

In December of 2009, I had the extraordinary privilege of seeing manta rays while diving off Kaduva Island with the dive crew from the Matava Eco-Resort. It is thanks to the environmental ethic of this team that these dives are very controlled to make sure the animals are disturbed as little as possible.

The video allows us to share all the observations listed below as well as giving you the chance to laugh when you hear my underwater screams of joy when the mantas break from their feeding behaviour, get into a formation of 5 animals and swim by us 4 times! I didn’t even realize I was making these sounds but my dive buddy was there behind me, capturing it on video.

The video shows:

Holy manta rays are big! They are the biggest rays in fact; up to almost 7 m across and more than 1,000 kg. The ones we saw are probably about 4 m across.
They are very “alien” looking animals. They feed on plankton and small fish and can scoop more food using the two big paddle-shaped flaps (“cephalic lobes”) that are just to the inside of their eyes. You will see from the murkiness of the water that it is thick with plankton. The circular diving pattern of the mantas is believed to help them concentrate the plankton.
That manta rays have a relatively short tail for a ray, no stinging spine and you’ll see one animal in the video that has had their tail shredded off, likely by a tiger shark.
That sometimes there are remoras attached to the manta rays. These fish may help in removing parasites and have the benefit of transportation, being less visible to predators and possibly getting some scraps as snacks.
That mantas are incredibly graceful, having very flattened bodies and big wing-like fins.
They can be told apart as individuals. Of course the one with the shark injury is easy to tell apart from the others. There is also one that has had its left fin tip bitten off. But if you look even more closely, you’ll see that each animal has unique markings on their upper and undersides. We passed on our photographs and video for research but, even though they are easy to tell apart, so little is known about them.
They are intelligent and coordinate their movements. This is what I found the most fascinating of all, how they knew to all get into a line at the same time and as each of them came by, they were observing me. They pivoted their eyes back to get the longest look possible at the strange creature who couldn’t stop from screaming out in sheer amazement.

California Sea Lions Barking Underwater – video!

This posting is typical for why I set up this blog (and the identity of “The Marine Detective”). I want to share what I learn from my marine adventures.

I was diving off Northern Vancouver Island when my buddy and I had a “swim-by” from several male California Sea Lions and one male Steller Sea Lion.

Many of you know that the two species can be discerned very easily because California Sea Lions bark and Steller Sea Lions growl. Yep, you could be blind and determine which sea lions species is present.

You can’t miss the barking of California Sea Lions when they are on land.

What I hadn’t fully realized was . . . you can hear them bark underwater too!

See my video below./strong>

Please note that it is against my ethics (and the law) to target seal and sea lion haulouts for the purposes of diving with them. This certainly constitutes “disturbance” of marine mammals and also leads to the animals losing their wariness and becoming habituated to humans. This has led to significant human injury. It definitely does not help the seals and sea lions either to be habituated to people as there are those who believe there are “too many” and that they should be killed.

However, sometimes, as a result of being in their ocean, we have unexpected encounters like the one videoed here.

Update 2018: The amended Marine Mammal Regulations (federal law) now specifically include: “No person shall approach a marine mammal to, or to attempt to: (b) swim with it or interact with it.”