Tuesday, March 15, 2022

Open mouth, evert foot

 It's been rainy and windy and cold all day. A good day to stay inside and watch barnacles.

Acorn barnacle fishing.

Barnacles stand on their heads inside their fortified castles, fanning their feathery feet (cirri) in the water, catching tiny fragments of food. There are 6 pairs of cirri; the first three are larger, and often the only ones seen.

The cirri also include gills, so the barnacle is breathing as well as fishing while he fans his legs through the water.

A quick sweep.

To capture these two barnacles with the cirri extended, I took 80 photos. A mouth opens, (not in the barnacle I was focussing on, usually) a hint of cirri appears. Next, maybe the mouth closes again. Maybe the cirri sweep out, vibrate for a moment, then fold back in, all in a short second. Maybe they sweep out, fold in almost too fast for the eye to capture them. They don't stick to any rhythm, and each barnacle has its own personal style.

They're faster than my shutter finger. 

In the photo above, you can also see the tentacles of a tiny anemone. At least these stay open most of the time, although they sway in the current.

The stone these barnacles sit on, with three anemones and a long-legged isopod.

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Llovió todo el dia; hubo un viento fuerte y frio. Un buen dia para quedarme en casa observando los bálanos.

Fotos: bálanos buscando su comida.

Los bálanos se paran de cabeza dentro de sus castillos fortificados, extendiendo sus piernas emplumadas (llamadas cirri) para pezcar pequeños fragmentos de comida. Hay 6 pares de estos cirri; los primeros son más grandes, y a veces son los únicos que se pueden ver.

Los cirri también contienen las branquias, así que mientras buscan su comida, también están respirando.

Para sacar estas dos fotos de bálanos en el acto de pescar, tuve que sacar 80 fotos. Una boca se abre, (pero no la del bálano que tenía enfocado, claro); se asoman unos cirri. En seguida, puede ser que la boca se vuelve a cerrar. O tal vez se extienden los cirri, vibrando por medio segundo, y se retraen. O pueden salir y desaparecer tan rapidamente que apenas los ojos llegan a verlos. Y no llevan ningún ritmo, y cada balanito tiene su propio estilo, muy personal.

Son más rápidos que mi dedo en el obturador.

En la segunda foto se ven también los tentáculos de una anémona miniatura. Estas por lo menos se mantienen abiertas por mucho tiempo, agitándose con los corrientes del agua.

La tercera foto muestra la piedra donde están fijos los bálanos, con tres anémonas y un bichito de patas largas, probablemente un isópodo.


2 comments:

  1. I didn't realize you have an aquarium!
    I just cleaned my goldfish tank. They keep me happy!

    ReplyDelete
    Replies
    1. It's a salt-water aquarium. Local invertebrates only, no fish. There are hermit crabs, anemones, barnacles, oysters, assorted snails, and a foot-long worm, sometimes other critters that hitchhike on the seaweeds I bring in for food and exercise equipment. And they do keep me happy.

      Delete

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