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Glass eel. Tail pattern, shown in picture 5, fits that of A. bicolor pacifica, based on figure 4 of (https://www.researchgate.net/profile/Nico-Leander/publication/233945182_Species_Composition_and_Seasonal_Occurrence_of_Recruiting_Glass_Eels_Anguilla_spp_in_the_Hsiukuluan_River_Eastern_Taiwan/links/0fcfd512b26cc06685000000/Species-Composition-and-Seasonal-Occurrence-of-Recruiting-Glass-Eels-Anguilla-spp-in-the-Hsiukuluan-River-Eastern-Taiwan.pdf?origin=publication_detail&_tp=eyJjb250ZXh0Ijp7ImZpcnN0UGFnZSI6Il9kaXJlY3QiLCJwYWdlIjoicHVibGljYXRpb25Eb3dubG9hZCIsInByZXZpb3VzUGFnZSI6Il9kaXJlY3QifX0)

The dorsal fin is short and starts at where the black and red arrow is pointing at in photo 6,7, meaning this is a shortfin eel. No dorsal fin occurs in front of this point, as shown in photo 3, 8 and 9.
Can refer to photo 1 and 2 for dorsal fin length in proportion to body.

Same dorsal and anal fin starting point.

This is A. bicolor pacifica, if I am not wrong. A Hong Kong first record.