The aquatic farm manager, as the owner of the aquafarm, is granted all rights related to aquafarming and sales of its products. This profession involves building the aquafarming facility, securing the aquatic organisms, feeding according to species, and taking necessary measures to prevent diseases as well as protect against natural disasters such as typhoons. The fish farming business in Korea is conducted on a relatively small scale, requiring few workers. In many cases, the aquatic farm manager hires additional workers on a seasonal basis. The manager ensures the optimum condition for the breeding of aquatic organisms and feeds them according to the pace of their growth so as to populate fish, shellfish or sea algae in the designated water. Cultivating methods vary by species. For example, fish or abalone are cultivated in a cage under the sea; oysters and seaweeds such as laver or sea mustard are cultivated by attaching spores to nets or ropes. Bringing cultivated fish and shellfish into the market after the sorting process is also part of the aquatic farm manager's tasks. To cultivate fish in a cage, an aquaculture license is required. However, the government is currently restricting issuance of new licenses on many species. Accordingly, many operators purchase aquatic farms from the license holders in order to operate their business. An aquaculture engineer refers to a person who has the highest expertise in aquafarming. They hold sophisticated knowledge and practical experience in cultivation of aquatic life. Applicants should major in fisheries and marine related areas in university and pass the exam administered by the Human Resources Development Service of Korea. Aquaculture engineers usually work in research and administrative institutes, aquafarming enterprises (fisheries company), and marine products processing companies.

The inspector provides medical treatment (including postmortem) and prevents diseases in marine life. He/she is eligible for opening an aquatic animal hospital and for issuing diagnosis, prescription, and injections after treatment. With the development of aquafarming industry, the types of aquatic diseases have been increasing in tandem with rising ocean pollutants. At the same time, the need to prevent and cure aquatic animal diseases has become stronger due to consumer demand for safer foods. To satisfy these demands, the certified public aquatic animal health inspector system was newly introduced in 2004. To become an aquatic animal health inspector, he/she must pass the exam administrated by the Ministry of Oceans and Fisheries. The exam is in the form of a written test and only those with a bachelor's degree in marine life medicine or other related area may take the exam. After acquiring the license and going through set procedures, he/she may open an aquatic animal hospital and provide medical treatment to marine life. He/she may also be employed by a fish disease research institute or pharmaceutical firm. In some cases, the Minister of Oceans and Fisheries and the Mayor or Governor may entrust the inspector and veterinarian with medical treatment for marine life, research on disease, prevention and cure for epidemics, improvement of marine life health care and environmental hygiene. In these instances, these individuals are called certified public aquatic animal health inspector.

A fisheries wholesale trade agent/broker buys fisheries products in a wholesale market and trades them wholesale or mediates trades. Trading products in wholesale here means buying the products with one's own capital and re-selling them to the retailers. On the other hand, mediating trades means purchasing fisheries products at an auction at the prior request of retailer/wholesaler or processing manufacturer and handing over the products to them for a brokerage fee. In both cases, he/she needs to be approved or designated by the established body of agricultural/fisheries wholesale market (joint or private market). The approval or designation period ranges from 3 years (5 years for a corporate body) to 10 years. He/she also needs to deposit a certain amount of collateral to guarantee payment of trade. Compared to just a few years ago, wholesale markets are dwindling due to the remarkable growth of distribution centers, mega retailers and electronic commerce. Consequently, the job market for the fisheries wholesale trade agent/broker under the wholesale market is somewhat shrinking. Nevertheless, they continue to play an important role in large-scale fisheries trades.

A fisheries auctioneer refers to an individual who arranges the buying and selling of fisheries products at an auction. He/she needs to be designated by the established body of the agricultural/fisheries joint market or private wholesale market. Prior to the auction taking place, the auctioneer needs to make certain preparations: arrange the time and place of the auction; set the order of the items to be auctioned; and explain the bidding items. While the auction is in session, he/she invites bids, observes the buyers' atmosphere to stimulate competition for bidding, and displays the winning bid by hand or on the computer screen. After the auction is over, he/she announces the result of the bidding to the highest bidder. You may have watched auctioneers bending and stretching their fingers during an auction on television. This is called a hand signal. When the auction is on-going, the auctioneer communicates with his/her hand and fingers, and so, he/she needs to have nimble fingers. The auctioneer works in a designated wholesale market and joint market for fisheries products nationwide. He/she is required to have experience as an assistant auctioneer for at least 1 year after graduating from high school and passing the auctioneer's exam. The exam is normally held biennially, but the exam year may change when it is deemed necessary by the Minister of Oceans and Fisheries. The exam consists of a written test and a practical (simulation auction) test.

An air-conditioning and refrigeration technician maintains one of the most important areas in fisheries processing: freezing of marine products. The technician conducts all tasks related to operating refrigeration machines to make ice or store food, and controlling air-conditioning equipment which circulates the air at appropriate temperature and humidity. An air-conditioning and refrigeration technician specializes as a refrigerator operator or air-conditioner operator depending on their role. He/she first establishes the operating condition of the machine for the appropriate temperature, adjusts valves, and keeps a daily log after checking the pressure, temperature, current and voltage of the machinery and equipment. He/she must identify and take proper measures if there is a problem with machinery. In addition, the technician ensures proper operation of the auxiliary equipment such as compressor, condenser, evaporator, motor, pump and valve, and repair them when necessary. In performing this check-up, he/she must read the figures on the instrument panels quickly and accurately; detect any malfunction by observing the operation condition of machinery; adjust valve levers and switches quickly and accurately; and repair any malfunctioning machinery. He/she must have knowledge and techniques to detect malfunction by the operation sound or signal lamp; and have the quick judgment and ability to cope with emergency situations such as abnormal increase of pressure or temperature, or gas leak. To hold this profession, he/she must earn a certificate (air-conditioning and refrigeration certified technician class 1 and 2 or high pressure gas certified technician class 1 and 2) after studying air-conditioning and refrigeration in a fisheries related high school or taking mechanics or related subjects in a technical high school or junior college. In many cases, applicants complete training courses at a vocational college or a private academy. The technicians may work in food storage and processing companies, ice-making and baking companies, chemical product manufacturing companies, low temperature warehouse companies, pharmaceutic companies, pelagic fishing vessels, large buildings, and air-conditioner and refrigerator manufacturing companies. To some extent, they need to tolerate cold and noisy work environments, and be aware of the electrical shock hazards.

Aqua field purification and maintenance encompasses such tasks as preventing aqua fields from causing environmental pollution; efficient use of aqua fields; collecting and disposing of aqua field sediments for the establishment of fisheries production ground without polluting the environment; grinding aqua field floor and laying new sands; and reorganizing aqua field facilities. The detailed instructions on these tasks are specified in the Fishing Ground Management Act. To become an aqua field purification/maintenance manager, he/she is required to register with the relevant city or provincial authorities after meeting the requirements related to their vessel, engineering staff, capital, facilities, and equipment as set forth by the presidential executive order. Accordingly to the current law, firstly, the manager is required to have one or more skimmer vessel(s) of 30 tons or higher and one or more barge(s) of 50 tons or higher to collect, salvage and carry lost fishing gears, fish net or sewage accumulated under the aqua field. Secondly, he/she must have one or more engineering staff who holds at least one national technical certificate in one or more areas among ocean, marine environment, marine resource development, marine engineering or marine investigation. Third, he/she is required to have more than 200 million KRW of capital. Fourth, he/she must be equipped with a crane of 1 ton or higher, a winch of 5 tons or higher, and at least one set of diving gear and underwater video equipment each.

A shipowner is the owner of a ship who has the full authority over production and sales of fisheries harvested by the fishing vessel. He/she has the final say in purchasing the vessel, recruiting the captain and maritime officers, and choosing where to sell the catch. The captain is fully in charge of the fishing vessel's operation and crew. The fishing vessel's crew includes maritime officers and engineers just as in a cargo fleet and passenger ship. When a fish school is found, all crew members stop their work to join the fishing operation. Wages of fishing vessel crew are decided on a different method than the general vessel crew. A common way of fishery management system is one where the shipowner first covers the vessel's operation expense in advance and once the catch arrives; the prepaid operation expense are deducted from the cost earned from selling the catch, and the remainder is distributed between the shipowner and the vessel crews as according to pre-decided rates. Lately, there are many cases where a fixed amount of monthly rates are paid and additional costs are paid upon the ship's arrival at rates set beforehand. To start a fishing vessel business, a shipowner must acquire a fishing business license for each of their fishing vessels and gear in the fleet. A license issued by the Minister of Oceans and Fisheries is required for motor fishing vessels of 8 tons or higher, and by the Mayor or Governor of the district for vessels under 8 tons. However, since an excess number of fishing licenses have been issued, new licenses are difficult to acquire. Therefore, in addition to purchasing the vessel, licenses are typically purchased from existing license holders. In addition, most fishing vessels that are below 200 tons must have a 6th class maritime officer or a 3rd class communication specialist as well as a captain onboard. Deep-sea fishing vessels must have maritime officers who hold a marine technician license as stated in the law according to the tonnage of the vessel.