This research analyzed the fishing data of sampling ships in Suao, Yilan from 1997 to 2008 to clarify the relationship between oceanographic conditions and bigeye tuna fisheries. The fraction of bigeye tuna was between 0.04% and 8% in the 12 year dataset. The main fishing season was between March and August and interannual fluctuation in total landings was observed. The observed fork length of bigeye tuna was between 63-217 cm, with an average of 110 ± 17 cm. The exponential function of length-weight relationship was WT = 4.823 × 10-5 × FL2.804, and interannual differences was significant.