The effect of long stay at coal and iron ore exporting ports in Australia due to port congestion for last three years has remarkably appeared on the bio-fouling and fuel consumption of ships on homeward voyages. The coal export volume from Australia to Japan is so big that a lot of coal carriers destined for Japan are obliged to wait for long time at loading ports in Australia. This effect is a big problem for ship operating companies accompany with the rise of fuel oil price. Bio-fouling also is considered as the causes of transportation of aquatic species. The necessity of counter measures against bio-fouling has been discussed at IMO.rnThen authors investigated the conditions for last 10 years of port stay of ships for Japan at Newcastle and Gladstone which are main coal export ports. And also the operation record of a coal carrier engaged in Australian service was investigated.rnThe effect of bio-fouling of ship was analyzed based on the coefficient of fuel consumption for unit hour as the evaluation value.%昭和47年に発生した全日本海員組合の長期スrnトライキ解除後の航海において船速低下が問題とrnなり、その対策として緊急入渠やUWC（Under rnWater Cleaming：船底清掃）が実施されたことはrn記憶に残るところである。また、サウジアラビアrnのオイルマネーによる経済発展に伴いジュダ港にrn集中した貨物船の長期間にわたる滞船も記録的なrnものであった。
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