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Management Briefs: Use of Ultrasonic Images for Rapid Nonlethal Determination of Sex and Maturity of Pacific Herring

1989; Wiley; Volume: 9; Issue: 3 Linguagem: Inglês

10.1577/1548-8675(1989)009 2.3.co;2

1548-8675

Scott A. Bonar, Graham Thomas, Gilbert B. Pauley, Roy W. Martin,

Marine and fisheries research

We investigated the feasibility of using ultrasonic images to rapidly sort Pacific herring Clupea harengus pallasi by sex and state of maturity and found that this could be done with a high degree of accuracy. We first compared low-resolution ultrasound images of 64 Pacific herring to dissections to learn how to interpret the images. We then examined 112 other fish to evaluate the accuracy of the technique. All of 21 males with gonads weighing more than 2.9 g (ratio of gonad weight to body weight, or gonadosomatic index, 4.5) and 22 females with gonads weighing more than 8.5 g (gonadosomatic index, 12.0) were correctly sorted to sex with the ultrasound scanner. In 69 other fish, gonads weighed less than 2.9 g, and sex was indistinguishable.