| Summary: | 碩士 === 國立臺灣大學 === 漁業學系 === 82 === The Taiwanese tuna deep longline fisheries developed rapidly
these years, and most of the catches were exported to Japan
for sashimi. Therefore, the fluctuation of Japanese market
will influence Taiwanese tuna fisheries. The objectives of this
study are to analyze the demand of tuna in Japan, and offer
market strategies for government and fishermen. Under
the demand theory, the study assumes that the demand
quantity of tuna is the function of the price of tuna,
other fish, beef, pork, chicken, and income. All variables
are transformed to the forms of change rate. the demand
function of tuna is following: Q1=-0.0136-1.0289**P1+0.4888
P2-0.4054P3-0.072P4-0.2058P5+1.2234*X tuna demand (tuna)
(fish) (beef) (pork) (chicken)(income) The price of tuna and
income have significant effects on tuna demand, but the
prices of other meats don''t. At the same time, the high
values of price elasticity and income elasticity of tuna
show the demand potential in Japan. Then, the single equation
of double logarithm were used to analyze the demand of the
principal supplying countries'' frozen tuna in Japan. Under
the same price, the demand quantities of frozen bigeye are:
Japan, Taiwan, other countries and South Korea in order. The
Supplied quantities of bigeye of Taiwan were 8 thousand tons
in 1981 and 30 thousand tons in 1993, And the price increased
yearly. The result may comes from the upgrade of tuna quality
so that the price increased and the demand curve is upward.
Concerning the demand quantities fo frozen yellowfin tuna,
the price elasticity and income elasticity of Taiwan are the
highest. The tuna of Japan and the tuna of Taiwan show
substitution. The price of Taiwanese yellowfin tuna
decreased and the quantities increased these years. The
observed values scatter on the theoretial demand curve.
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