English: In addition to the two research trips to Hainan Island, several Taihoku Imperial University professors also accepted the commission of the Naval Special Service Department to conduct research on the Hlai people and their environment, leading to five research publications afterward. Two papers were related to natural history, one of which, "Plants of Hainan Island Ⅰ" by Yamamoto Yoshimatsu, covered an inventory of 1700 specimens and an illustration of vegetation located in the southwest region of Hainan Island. The other paper, "An investigative Report of Freshwater Fish in Hainan Island" by Harada Isokichi, was focused on how he conducted fish research by blast fishing in nine major river systems on the island.
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