These are a sort of series of the fish. Same as the "Partridges" series. I make these using a chopstick I got in Japan almost 15 years ago. Same one of the two set I've been using ever since. The process is to dip the chopstick into a dish of India ink and put it to paper to do the drawings. I think this creates an interesting, un-preconceived line for each and every mark. There are "mistakes" in all of them, but like people, our inconsistencies make us unique, so I am going with that.
PS Every fish in the series (I've done about 20 of these) has a beginning and an end. Read: Nose, Eye and Tail Fin.