Bottom trawling is devastating to the fragile underwater environment. It involves ships dragging huge weighted nets in deep water near underwater mountains (seamounts) scoop up all marine life in their path, from valuable fish to inedible species and delicate corals. New Zealand will take its concerns to the United Nations and regional partners to address the issue of seabed trawling. Bottom trawling is used widely by most fishing nations. New Zealand and Australia are working together to identify areas for protection in the Tasman Sea. The Government would also work with other countries to âimprove biodiversity protection of the high seas and develop practical enforceable outcomesâ 20-30 New Zealand-flagged vessels are involved in the practice.