On subjectivity in the judging of acoustic records; comparison of degree of homogenity in allocation of echo values by different teams

摘要

On four fish abundance estimation surveys in the Barents Sea, january-february 1993,the acoustic records were judged by two independent teams. We have analyzed thedegree of homogenity in allocation of echo values to various species by the differentteams.In general the average echo value allocated to a species was rather similar, but significantand noticeable differences were detected. Studies of the allocation in a one-to-one andtime scale revealed greater variations, but still a reasonable degree of similarity in judgementby the different teams. The reason for variation in allocation of echo values to variousspecies among different teams are discussed.