STUDY OF THE EFFECTS OF SOME ENVIRONMENTAL FACTORS ON THE DISTRIBUTION OF PELAGIC FISH IN THE SOUTH CHINA SEA (BY THE EXAMPLE OF TUNA)
Journal Title: Вестник Астраханского государственного технического университета. Серия: Рыбное хозяйство - Year 2014, Vol 0, Issue 2
Abstract
Features of aquatic environment have a significant impact on the behavior of migratory and adjacent to pack fish species that may indirectly affect the results of the assessment of their stocks and operating reliability of forecasts. Fishery population distribution is influenced by physical environmental conditions in two ways. Sea currents can make fish species migrate from one area of the sea to another. Water temperature, its oxygen content, offshore distance and other factors make environment more or less atrative for fishes. Having studied all the factors it is possible to collect all necessary information and to create a data base and to forecast the distribution and change of the area and time of fishery objects, as well. In the Vietnamese offshore regions, there are two main high-value tuna species – Yellowfin tuna Thunnus albacares and Bigeyed tuna Thunnus obesus – that play a significant role in Vietnamese economy. The fishery is carried out by the longline method. The preliminary results help estimate the influence of environmental conditions on the distribution, fish catchability and tuna stock in the South China Sea; determine the temperature structures, large-scale circulation, which are the important factors for offshore fishery population assessment and tuna distribution forecasting. In order to get the specific findings and to build up a model of stock assessment and forecasting of operation of fish found the central sea areas more effectively, it is necessary radically to intensify the research in the field of fishery oceanography, especially for different types of pelagic fish.
Authors and Affiliations
Nguyen Dang Kien , Peter Bukharitsyn
Keywords
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