Foreigners may not fish within Turkish territorial or inland waters. And foreigners may not register a fishing vessel under the national flag, unless the vessel belongs to a legal person set up in accordance with Turkish laws, with the majority of managerial staff and representatives of Turkish nationality and with the voting majority held by partners of Turkish nationality.
"ARTICLE 940 - (1) Every Turkish ship hoists the Turkish Flag.
(2) The ship owned only by a Turkish citizen is a Turkish ship.
(3) Ships owned by more than one person;
a) In case of joint ownership, the majority of the shares,
b) In case of joint ownership, majority of the owners,
They are considered as Turkish ships provided that they are Turkish citizens.
(4) Established in accordance with Turkish laws;
a) Ships belonging to organizations, institutions, associations and foundations having legal personality, majority of the persons constituting the management body are Turkish citizens,
b) Ships belonging to Turkish commercial companies, the majority of those authorized to manage the company are Turkish citizens and the majority of the votes are in Turkish shareholders according to the company agreement, in joint stock companies and limited partnerships whose capital is divided into shares, the majority of the shares are registered and the transfer of the shares to a foreigner is subject to the permission of the company's board of directors,
provided that they are considered as Turkish ships.
(5) Ships owned by armament subsidiaries registered in the Turkish trade registry are considered Turkish ships, provided that more than half of their shares are owned by Turkish citizens and majority of shareholder shipowners authorized to manage the subsidiary are Turkish citizens.[...]" (Commercial Code (No. 6102 of 2011), last amended 3.2.2021, Article 940 [google translation])
--------------------
"Prohibition of foreign fisheries production:
Article 21 – (Amended first paragraph: 22/7/2003-4950/2 art.)  Persons who are not Turkish citizens enter the territorial waters specified in Article 1 of the Law No. 2674 or inland waters specified in Article 4 of the Law No. hunting is prohibited.
However, foreign tourists listed in paragraph 7 of Article 3 and foreigners who will work in studies and research works specified in Article 14, pursuant to the permission of the Ministry of Agriculture, Forestry and Rural Affairs, are exempt from this provision.[...]" (Fisheries Law (No. 1380 of 1971), last amended on 17.2.2021, Article 21 [google translation])
Commercial Code (No. 6102 of 2011), last amended 3.2.2021, Article 940
Fisheries Law (No. 1380 of 1971), last amended on 17.2.2021, Article 21
[<a href="https://www.mevzuat.gov.tr/mevzuat?MevzuatNo=6102&MevzuatTur=1&MevzuatTertip=5">Code</a>],[<a href="https://www.mevzuat.gov.tr/mevzuat?MevzuatNo=1380&MevzuatTur=1&MevzuatTertip=5">Law</a>]