The World Wide Fund for Nature says that 90% of all northern right whales killed by human activities are from ship collision, calling for restrictions on the movement of shipping in certain areas. Noise pollution threatens the existence of cetaceans. Large ships and boats make a tremendous amount of noise that falls into the same frequency range of many whales. By-catch also kills more animals than hunting. Some scientists believe pollution to be a factor. Moreover, since the IWC moratorium, there have been several instances of illegal whale hunting by IWC nations. In 1994, the IWC reported evidence from genetic testing of whale meat and blubber for sale on the open market in Japan in 1993. In addition to the legally permitted minke whale, the analyses showed that the 10–25% tissues sample came from non minke, baleen whales, neither of which were then allowed under IWC rules. Further research in 1995 and 1996 shows significant drop of non-minke baleen whales sample to 2.5%. In a separate paper, Baker stated that "many of these animals certainly represent a bycatch (incidental entrapment in fishing gear)" and stated that DNA monitoring of whale meat is required to adequately track whale products.

It was revealed in 1994 that the Soviet Union had been systematically undercounting its catch. For example, from 1948 to 1973, the Soviet Union caught 48,477 humpback whales rather than the 2,710 it officially reported to the IWC. On the basis of this new information, the IWC stated that it would have to rewrite its catch figures for the last forty years. According to Ray Gambell, then Secretary of the IWC, the organization had raised its suspicions with the former Soviet Union, but it did not take further action because it could not interfere with national sovereignty.

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