The use of pulse‐echo acoustic microscopy to non‐invasively determine the sex of living larval sea lampreys
Identifieur interne : 000D86 ( Istex/Curation ); précédent : 000D85; suivant : 000D87The use of pulse‐echo acoustic microscopy to non‐invasively determine the sex of living larval sea lampreys
Auteurs : E. Maeva ; I. Bruno ; B. S. Zielinski [Canada] ; M. F. Docker [Canada] ; F. M. Severin ; R. G. MaevSource :
- Journal of Fish Biology [ 0022-1112 ] ; 2004-07.
English descriptors
Abstract
A rapid, accurate and non‐invasive method to determine the sex of larval sea lampreys Petromyzon marinus, using wide‐field pulse‐scanning acoustic microscopy, is described. Cross‐sectional pulse‐echo scans were made with a high‐resolution acoustic microscope in 48 larvae (110–130 mm total length, LT), and the acoustic images generated showed such internal body structures as the gonad, intestine, kidneys, cardinal veins, notochord and musculature. Females were identified by the presence of a relatively large (1–1·5 mm diameter) ovary, which was considerably less reflective to the 15 to 25 MHz acoustic signals than the surrounding kidney tissue. Males were recognized by the lack of the large non‐reflective ovary and, in some cases, the appearance of a small (0·2–0·3 mm) testis with slightly stronger reflective properties than the kidney. Identification of sex was confirmed by optical microscopy following dissection, and in a blind test on an additional 10 specimens (121–168 mm LT), the acoustic method reliably identified sex in 100% of the larvae. These results indicate that acoustic microscopy can determine the sex of live sea lamprey larvae in c. 30 s per animal, a process which until now required dissection or invasive surgery.
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DOI: 10.1111/j.0022-1112.2004.00439.x
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E. Maeva<affiliation><mods:affiliation>Department of Physics, University of Windsor, Windsor, Ontario, N9B 3P4, Canada,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics, University of Windsor, Windsor, Ontario, N9B 3P4, Canada,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics, University of Windsor, Windsor, Ontario, N9B 3P4, Canada,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation><affiliation><mods:affiliation>Department of Physics, University of Windsor, Windsor, Ontario, N9B 3P4, Canada,</mods:affiliation><wicri:noCountry code="subField"></wicri:noCountry></affiliation>Le document en format XML
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Cross‐sectional pulse‐echo scans were made with a high‐resolution acoustic microscope in 48 larvae (110–130 mm total length, LT), and the acoustic images generated showed such internal body structures as the gonad, intestine, kidneys, cardinal veins, notochord and musculature. Females were identified by the presence of a relatively large (1–1·5 mm diameter) ovary, which was considerably less reflective to the 15 to 25 MHz acoustic signals than the surrounding kidney tissue. Males were recognized by the lack of the large non‐reflective ovary and, in some cases, the appearance of a small (0·2–0·3 mm) testis with slightly stronger reflective properties than the kidney. Identification of sex was confirmed by optical microscopy following dissection, and in a blind test on an additional 10 specimens (121–168 mm LT), the acoustic method reliably identified sex in 100% of the larvae. 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