《土州の水産》（どしゅうのすいさん）第9號（1923年7月）刊載〈臺灣鰹漁業開始に就て戶田圓次談〉（文責龜谷生）、以及在10號（同年11月）中刊載〈戶田氏經營臺灣鰹漁狀況〉，文中指出在臺灣東北部海域，有高知縣人經營鰹漁的活動，且是非常普遍的現象。《土州の水產》創刊於1922年，是高知縣水產會（會長田村實）發行的會報。當時期高知縣水産界的官民的動向，可從中得知具體第一手史料。戶田圓次（とだまるじ）出身本縣高岡郡大矢井賀（たかおかぐんおおやいが），透過其從事漁業活動；以及代表基隆業者的西村多郎助（にしむらたとうすけ），其所從事鰹漁業活動的互動過程中，從中瞭解到日治時期・基隆的鰹漁業展開及其特徴――日本人社會網絡取得内容。但是，在〈臺灣鰹漁業開始に就て戶田圓次氏談〉（第2段，4頁約3000字（僅談話部分）的記事文字，無標示任何句點，段落亦幾乎沒有，閱讀極為困難。本文主要是介紹其具體的内容，並由筆者標示句點、段落（段落附加號碼）。同時，在各段落補充主題和大意，以及附加簡單注釋。針對「戶田圓次氏談」的內容，個人擬定以下題名討論：〈針對高知縣沿岸區域的鰹漁業環境，戶田所意識到的問題〉、〈戶田進出臺灣的契機：能全年進行鰹漁業的海域探查及縣外漁業視察〉（明治44・1911年～大正5・1916年）、〈為獲得在臺灣從事鰹漁業的權利，和總督府的事先交涉〉（大正9・1920年）、〈經過第二次的視察，取得在臺灣居住的資格並於基隆開設鰹魚乾製造工廠（大正11・1922年）、〈在事先各項的活動成果上，以基隆為據點正式展開了鰹漁業及鰹魚乾製造〉（大正12・1923年）。再者，根據〈戶田氏經營臺灣鰹漁狀況〉一文，得知戶田圓次渡臺後，主要是利用二隻漁船（第二、第五進取丸），展開鰹魚捕撈事業。捕獲的漁獲額是同業者中上左右，漁場是從基隆岸至火燒島，此狀況與同時期以基隆港為據點的漁民業者，所補的漁獲數量是一致的。由是可知，戶田以基隆為中心，並以鰹釣漁為基礎，在「臺北州基隆市社寮八尺門」設立「戶田鰹節製造工場」，努力經營該製造事業。（參見《鰹節製造試験報告第三報》（臺灣總督府殖產局殖產局出版第504號昭和3年2月27日）「臺灣ニ於ケル鰹節製造工場分布圖」の表）其後，戶田圓次所操作不僅是鰹漁業、鰹節製造，對於其他魚種亦進行操業，就如其周邊的業者，可見到亦是如此。但戶田圓次經營之事業並非都是如此順利。根據1928年（昭和3年）臺灣總督府文書記載登記戶田「二艘曳機船底曳網漁業」（にそうびききせんそこびきあみぎょぎょう）的「許可狀」讓渡為「西村漁業會社」（代表人應是西村多郎助），此可見一斑。透過對戶田圓次的鰹釣漁、鰹節製造業資料的介紹，個人以為今後可進一步研究課題，有以下二方面：（一）透過戶田圓次的行動可看出，大正時代後半日本本土各縣間（愛媛縣、宮崎縣等）在臺灣為取得捕魚權的激烈競爭，特別是高知縣，可看得出在進軍臺灣漁業上明顯落後於其他縣。前往南方澳的移住事業亦可考量為是基於此漁業權力競爭下的產物。在該時期的日本國內，和靜岡縣一樣，沒有像是針對臺灣進行的漁村建設活動，而有一些是朝向所謂遠洋、近海漁業發展的地區，關於此分歧點，我認為有必要進行考察。（二）在戶田圓次的活動中，針對基隆的鰹魚乾製造業，引進了被稱為「土佐式」的鰹魚乾樣式，在確立此樣式上扮演著十分重要的角色。同時，亦可考量最終是在以西村多郎助為代表的基隆鰹漁業・鰹魚乾製造業的主要趨勢下，被包含於其中。探求此過程一事，相信必能突顯出日治時期高知縣漁民移住臺灣的另一重要局面。

Volume 9 of Aquatic Products in Doshu (《土州の水産》, July 1923) includes an article entitled ‘Toda Maruji﹙戶田圓次﹚’s Account of the Start of Bonito Fishing in Taiwan’ (author: 龜谷生) and Volume 10 (November 1923) includes an article entitled ‘The State of Taiwanese Bonito Fishing Overseen by Mr. Toda’. These articles describe in detail how residents in Kochi Prefecture extensively engaged in bonito fishing activities in the northeastern waters of Taiwan at the time. The newsletter Aquatic Products in Doshu (《土州の水産》) was a newsletter first published by the Kochi Prefecture Fisheries Association (President: 田村實) in 1922, and it provides specific first-hand information on the trends of public and private sectors in the fishing industry in Kochi Prefecture at the time. Through the activities of Toda Maruji﹙戶田圓次﹚, a fisherman from 高岡郡大矢井賀 in Kochi Prefecture, and 西村多郎助, a bonito fisherman in 基隆with ties to Toda, the articles provide a closer look into the characteristics of the development of bonito fishing industry in Keelung, albeit within the Japanese community during Japanese ruling over Taiwan. However, the article ‘Toda Maruji﹙戶田圓次﹚’s Account of the Start of Bonito Fishing in Taiwan’ (referring only to the part of Toda’s narrative in the second paragraph spanning 4 pages, approximately 3,000 characters) is very difficult to read because there are almost no punctuation marks and few paragraphs. In order to focus on the specific content of that article, the current author has added punctuation marks to and paragraphized the text with numbers as well as included the topic and gist of each paragraph and provided brief supplementary notes. For the sake of discussion, the current author divided the article ‘Toda Maruji ﹙戶田圓次﹚’s Account’ into the following subsections: ‘The Problems Identified by Toda in Bonito Fishing Conditions in the Coastal Waters of Kochi Prefecture’, ‘What Led to Toda’s Foray into Taiwan: An Exploration of Waters where Bonito can be Fished Year-round and a Tour of Fishing outside the Prefecture (1911–1916)’, ‘Preliminary Negotiations with the Governor-General to Obtain Bonito Fishing Rights in Taiwan (1920)’, ‘Toda became a Resident of Taiwan Following His Second Tour and Established a Dried Bonito Factory in 基隆 (1922)’, and ‘Toda Started Full-scale Bonito Fishing and Dried Bonito Production Bussiness in 基隆 based on his previous efforts (1923)’. According to ‘The State of Taiwanese Bonito Fishing Overseen by Mr. Toda’, Maruji Toda arrived in Taiwan and began bonito fishing mainly with 2 boats (Shinshu Maru 2 and 5), and his catches were ranked upper-middle among his peers. His fishing grounds extended from the coast of Keelung to Huoshao Island (now Green Island). The amount of His catches were consistent with average fishermen based in the port of Keelung at the time. Based on bonito fishing primary off Keelung, Toda established the “Toda Katsuobushi Factory” (戶田鰹節製造工場) in Bachimen (八尺門, located in Sharyo, Kirun City, Taihoku Prefecture, 臺北州基隆市社寮) and devoted himself to its operation (see Katsuobushi Manufacturing Report (《鰹節製造試験報告》) No. 3 (the Industry Bureau, Office of the Governor-General of Taiwan, Industry Bureau Publishing, No. 504, February 27, 1928, Table: 台湾ニ於ケル鰹節製造工場分布図). In addition to bonito fishing and dried bonito production, Toda Maruji﹙戶田圓次﹚ later engaged in fishing for other fish species (as other fishermen did as well), but that business did not always go as smoothly. According to documents from the Office of the Governor-General of Taiwan, Toda transferred his Permit for「Pair-Boat Type Danish Seine Trawl Fishery」(二艘曳機船底曳網漁業) to the 西村Fishing Company (which was probably headed by 西村多郎助) in 1928. Topics for future research on Toda Maruji﹙戶田圓次﹚’s bonito fishing and dried bonito production include the following: (1) The actions of Toda Maruji﹙戶田圓次﹚ reveal intense competition to acquire fishing rights in Taiwan among prefectures in the Japanese mainland (such as Ehime and Miyazaki prefectures) in the latter half of the Taisho era. In particular, Kochi Prefecture appeared to have participated in the fishing industry in Taiwan later than other prefectures. The emigration of fisherman from Kochi Prefecture to Nanfangao in Taiwan, as the current author has described and examined thus far, was apparently a result of that scramble for fishing rights at the time. In Japan at the time, regions such as Shizuoka Prefecture were not interested in establishing fishing villages, at least not in Taiwan, but were instead interested in deep-sea and coastal fishing. The reason for this divergence requires further examination. (2) For the dried bonito production industry in Keelung, Toda Maruji﹙戶田圓次﹚ played a major role in introducing and establishing the Tosa style katsuobushi. At the same time, this katsuobushi style was eventually incorporated into the mainstream bonito fishing and dried bonito production in Keelung, as exemplified by 西村多郎助. By ascertaining this process, this study shall bring to light an important aspect of emigration of fisherman from Kochi Prefecture to Taiwan during Japanese ruling over Taiwan.