This is a pair of bicolor goatfish (Parupeneus barberinoides) engaged in the process of making little aquatic goats:
This type of behind-the-scenes making-of-little-fishes happens all the time, so it's no big deal, right?
Actually...this pair of piscines was further north than the generally accepted range for this species.
Fishbase describes the northern limit of this Indo-Pacific species as "north to the Ryukyu Islands," which is the archipelago comprising Okinawa and associated smaller islands.
Okinawa is located at about 26.3ºN. I photographed this pair at approximately 31.6ºN.
That equates to around 550km (340 miles or so for the metrically challenged).
I thought I'd share this with you as a follow-on to my previous post about the adorable whitespotted pygmy filefish (Rudarius ercodes) tending to her eggs. In that instance, I believe the chances of little filefish surviving the colder months of Hokkaido are slim.
In this case, I have seen many multi-hued baby goats grazing the ocean floor after taking the above photo. The number of mature fish seems to have increased as well. I think it reasonable to conclude that this species has successfully extended its range (and might still be doing so).