Showing posts with label scallop. Show all posts
Showing posts with label scallop. Show all posts

Friday, May 12, 2023

White crowns and purple feather-dusters

 About those purply worms ...

It was a bright, clear day, with barely a ripple on the water; just the kind of day to be poking around under docks.

Brown's Bay. The docks float on these blue tubs, a comfortable home for a variety of critters.

I like this muddled view. Dock planks, reflections of overhead structures, algaes and anemones underwater, overlaid by those reflections.

Most of the tubs carry the giant plumose anemones and a scattering of green sea urchins.

Urchins, anemones, and a wide-open scallop mouth.

The Giant Plumose anemone, Metridium farcimen, is white or brown, sometimes with a brown column and white tentacles. It can be distinguished from the Short Plumose by the lobed tentacular crown, as seen here, as well as by its size; it grows up to 1 m. tall, whereas the Shorts barely reach 10 cm. It likes low current sites, such as in this protected bay.

The scallop, probably the Giant Rock scallop, Crassadoma gigantea, (Update: Swimming scallop, Chlamys rubida) has an orange mantle, and if you look closely, a row of tiny eyes along the rim.
The abundant eyes of a giant rock scallop (Crassadoma gigantea) are backed with tiny mirrors that reflect light, unlike our eyes that use lenses to bend and focus light. The mirror in each eye has multiple layers to gather different wavelengths of light, and reflect that light onto a double-layered retina. (Jim Auzin's Photography)

Looking at me, looking at it.

And now, the worms.

Vancouver feather-duster worms, Eudistylia vancouveri, growing on a chain.

These are large tube worms, growing to 10 cm. long. In normal lighting, they look almost black, but bright sunlight brings out the purple and blue colouring.

Feathery red algaes to go along with the feather-duster worms.

A giant acorn barnacle, feeding.

In deeper water. A brown anemone with its white crown.

These long ribbed kelps attach to the tubs and float out into the sunlight.

On the way back to dry land, I leaned over the railing of the walk to look at the seaweeds growing on the sea floor. Tiny fish circled and swooped over them, echoing the flight of the swallows overhead.

Red and green algaes, eelgrass, and fish.

Next: clambering over rocks.

~~~~~~~~~~~~~
Acerca de esos gusanos plumero ...

Un dia de sol, con mucha luz y el agua casi sin olas; un dia ideal para andar rebuscando debajo de los muelles.

Foto #1: Brown's Bay. Los muelles se sostienen encima de estos botes flotantes azules, donde se encuentran comunidades de criaturas marinas.

#2: Me gustó esta foto toda revuelta, con las tablas del muelle, los reflejos de las estructuras arriba, y varios niveles de criaturas debajo, algunas vistas por medio de los reflejos.

#3: En la mayoría de los flotadores crecen las anémonas gigantes plumosas, y varios erizos de mar verdes. Aquí además hay una vieira de rocas con la boca abierta.

La anémona gigante plumosa, Metridum farcimen, es blanca o color café, a veces con la columna café y la corona blanca. Se diferencia de la anémona corta en que los tentáculos de la corona forman lóbulos, y además por el tamaño, ya que pueden crecer hasta 1 metro de largo, mientras que las otras llegan apenas a 10 centímetros. Les gustan los sitios con baja corriente, tales como esta bahía quieta.

La vieira, Chlamys rubida, tiene el manto anaranjado, y si te fijas bien, verás una hilera de ojitos en los labios.
Los ojos abundantes de una vieira de rocas (Crassadoma gigantea) tienen al fondo espejitos que reflejan la luz, en contraste con nuestros ojos que usan lentes para flexionar y enfocar la luz. El espejo en cada ojo tiene varias capas para captar la luz de distintas longitudes de onda, y reflejan esa luz hacia una retina de dos capas. (Jim Auzin's Photography)
#4: La vieira, mirándome.

#5: Y ahora, los gusanos. Son los gusanos plumero de Vancouver, Eudistylia vancouveri, y están creciendo fijados en una cadena en el agua. Estos gusanos, normalmente se ven casi negros, pero cuando la luz del sol les llega, se ven sus colores vívidos, morado o azules.

#6: En la misma cadena, unas algas rojas con filamentos finos.

#7: Un bálano gigante, buscando su comida.

#8: A la base de un pilote, las anémonas son más grandes. Aquí se ve una con la columna color café y la corona blanca.

#9: Estos quelpos se adhieren a los flotadores, y extienden sus largas hojas hacia el sol.

#10: Camino a tierra firma de nuevo, me detuve para mirar las algas al fondo del agua; algas rojas y verdes, y las hierbas Zostera. En el agua por encima, estos pececitos daban vueltas, como si copiaban los vuelos de las golondrinas en el aire arriba.

Mañana: algunas rocas.


Monday, March 06, 2017

Under the wharf, it's spring.

The tide was low, the sun was shining, and there was no wind; the perfect time to visit the docks and peer underneath the floats again. The water was smooth and clear, exposing the communities clustered along pipes and logs.

This year, or maybe this time of year, the sea urchins were out in full force. I hadn't seen them here before.

Under a floating office. Green sea urchins, about a couple of inches across.

More urchins, several scallops encrusted with weeds and worms, barnacles and a feather-duster worm, on a plastic pipe under the ramp.

A rusty pipe and a rope underneath the ramp. Sea urchins again, purple and beige feather duster worms, a red sponge (on the whitish pipe on the left) and a larger, greyish sponge. On the far left, a mass of tubeworms. At the top right, a brilliant red feather duster.

There were several masses of jelly, probably egg masses. This one was on a piling partly exposed by the low tide. I touched it; it was soft, but firm, not sticky.

This was down on the bottom, underneath a float. It's about a hand's width across. An anemone, but not one I recognize.

I have visited the docks several times during the winter, peering down the gaps between pilings, squinting between logs. All I have seen in the water were fish, maybe because of the lack of light, or possibly some of the summer residents have retreated to more sheltered locations. I'm glad to see the crowds coming back.



Wednesday, October 28, 2015

Lifer! Probably for both of us.

Under the logs and lumber of any floating construction, down where the sun rarely reaches, the water level is constant, the currents weakened, myriads of animals and plants live their sheltered lives, away from the prying eyes of the humans who clomp along overhead. Unless there is a gap between the floats, the surface is mometarily still, the light turns down at the perfect angle, and a human just chances to look down that gap at that moment. And then, if the human happens to be of a curious bent, she flops down on her knees or belly, and peers down that gap. And sees eyes, staring back at her.

Spiny pink scallop, Chlamys hastata. She has dozens of eyes, lined up along her lips. She can't see as well as I do; all she saw of me (I think) was my shadow.

Another angle, showing a bit of her shell, and two anemones sheltering underneath. The blue "pillar" is a mussel shell.

I'll back off a bit, to show the mini underwater garden along the base of the float I was lying on.

Tunicates, purple stuff, more tunicates, mystery critters, worms, and hydroids. Yesterday's anemones were just to the left of this patch.

Moving to the right; more tunicates, and the scallop.

I cropped these photos down, to show the individual critters a bit better:

Tunicates, unidentified. (With intake, outflow siphons circled.)

As far as I can tell, the pale cyan blobs have siphons, as well, and would be another species of tunicate (aka sea squirt). The red line in the centre points to another animal that is so transparent that its internal organs, and its food are visible through the wall. I think the other red line points to a half-way shut down anemone. On the far left, there is a hydroid stalk, and on the left of the base of the big tunicates, the flowery shape is the feeding tentacles of a worm.

Tunicates, tunicates, worms, etc. And what are those two potato-like blobs?

And there's still that pink thingie:

I think it may be a compound ascidian. like the red ascidian, or maybe the mushroom compound tunicate. Or something else? What do you think?

Worms tomorrow.

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