Midway between humble and fabulous. Photo from Elkhorn Slough

The toadfish sits on the bottom of the sea, singing a song of love.

It is a creature midway between humble and fabulous. It is small enough to fit into a person’s hand, and has a bulbous, grey-green, wet look. It is quite ugly, except for the luminescent dots (photophores) running along the length of its body, which give it a spiffed-up, dance party look, like the buttons of an ensign’s jacket, thus giving the toadfish its other name: the plainfin midshipman.

I have never seen a toadfish, but I have heard them singing.

Ordinarily the toadfish lives in the deep, dark sea. But when it is time to seek a mate, the toadfish swims up to the shallow, intertidal waters of a bay or slough. The male burrows into the mud at the bottom, and begins to sing, hoping by his song to attract a female to his burrow. Vibrating his swim bladder, the toadfish emits a clear, resonant tone — a steady drone, a hum. Other toadfish nearby tune in, and they synchronize their pitch with one another, so the water column fills with a continuous humming note. It can be quite loud, penetrating the hulls of boats and ships, keeping their occupants awake at night. It may even be loud enough to awaken those on land. It is often mistaken for a sound of mechanical origin: A distant ship motor, a generator, or some other machinery operating on the shore. But no: It is a sound the toadfish have been singing for probably millions of years, since long before humans existed.

On a recent swim along Muni Pier, aka Aquatic Park Pier, I heard the toadfish singing, each to each. I did not think they sang for me. But their song sounded, to me and my swim friend Zina, like a chant, really, a steady, clear, “OM” sound, somewhere around low A, and it was a song I felt I could join. The deeper I put my head into the water column, the clearer and stronger the sound became. If I could swim deep enough, I thought, I could enter into the sound completely, but I might never return. So instead, from the surface, I tried matching the note with a sound of my own, floating there with my face in the water, chanting my own OM into the water, bubbles blowing out of my mouth as I chanted along with the toadfish.

When I found the right pitch, my whole torso resonated with the sound. I had joined the chant, the chorus of the toadfish. It felt like the all-encompassing, penetrating tone of pure love. It was the sound of the universe singing to itself.