Thousands of seabirds and significant numbers of sharks and marine turtles are caught and killed each year in long-line fishing nets that target southern bluefin tuna, reveals a new World Wildlife Fund (WWF) report. Japanâs long-line southern bluefin tuna fleet killed 6,000 – 9,000 seabirds a year in 2001 and 2002 fishing seasons. About three-quarters of these were albatrosses and one-fifth petrels. It is estimated that annual seabird deaths from all southern bluefin tuna fishing could be as high as 13,500, including some 10,000 albatross. Of the 22 species of albatross, 19 are classified as threatened with extinction, according to the World Conservation Union.