They remind me of juvenile Bamboo Sharks.
I found this little bit about them from a German fish importer:
"For the first time we were able to import these charming hillstream loaches. Due to their origin (China) and their black&white coloration we call them dwarf panda hillstream loaches. Although the species has been scientifically described back in 1980 in a Chinese journal almost nothing has been published concerning the beautiful animal since then.
Our specimens are around 3 cm long. Unfortunately we have no reliable information about how big they can grow. But there can be no doubt that these small beauties that seem not be be delicate at all are a „must have“ for any real loach enthusiast."