Stretching the truth : length data highlight falsification of Japanese sperm whale catch statistics in the Southern Hemisphere

Clapham, Phillip J.; Ivashchenko, Yulia V.

doi:10.1098/rsos.160506

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Stretching the truth : length data highlight falsification of Japanese sperm whale catch statistics in the Southern Hemisphere

2016
By Clapham, Phillip J. ; Ivashchenko, Yulia V.
Source: Royal Society Open Science, 3(9), 1-6

[PDF-379.96 KB]

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Journal Title:

Royal Society Open Science
Personal Author:

Clapham, Phillip J. ; Ivashchenko, Yulia V.

Clapham, Phillip J. ; Ivashchenko, Yulia V. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) Less -
Description:

Falsification of reports on Japanese catches of sperm whales (Physeter macrocephalus) is known to have occurred at both land whaling stations and in North Pacific factory fleets. Here, we conduct an analysis of pelagic sperm whale catches in the Southern Hemisphere: we compare true Soviet length data from the Yuri Dolgorukiy factory fleet during 1960–1975 to data for the same period reported to the International Whaling Commission (IWC) by Japan. Prior to implementation of the International Observer Scheme (IOS) in 1972, the Soviet fleet killed 5536 females, of which only 153 (2.8%) were at or above the minimum legal length of 11.6 m. During the same period, Japan killed 5799 females and reported that 5686 (98.5%) were of legal size, with 88.5% of the entire length distribution reported as being between 11.6 and 12.0 m. This unrealistic distribution, together with the fact that Japanese fleets were supposedly able to catch 37 times the number of legal-sized females as the Soviet fleet, indicates extensive falsification of catch data by Japan. Further evidence of misreporting is that females >11.5 m dropped to 9.1% of the Japanese catch after 1971, when the IOS made cheating much more difficult. That 99.6% of 10 433 males in the pre-IOS catch were also reported to be of legal size, indicates that illegal catches were not confined to females. We caution that the Japanese sperm whale data in the IWC Catch Database are unreliable and should not be used in population assessments. The ease with which illegal catches were apparently made underscores the past failures of the IWC to effectively regulate whaling.
Keywords:

[+]

Fisheries Fraud Japan Sperm Whale
Source:

Royal Society Open Science, 3(9), 1-6
DOI:

https://doi.org/10.1098/rsos.160506
Pubmed ID:

27703712
Document Type:

Journal Article
Place as Subject:

Pacific Ocean
Rights Information:

CC BY
Compliance:

PMC
Main Document Checksum:

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urn:sha256:8bcbf5a4f1fba45f704c2bc74e8adffbb6df5fda10b57e7dca847f6df9fbaab9
Download URL:

https://repository.library.noaa.gov/view/noaa/24665/noaa_24665_DS1.pdf
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Stretching the truth : length data highlight falsification of Japanese sperm whale catch statistics in the Southern Hemisphere

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