Wyniki wyszukiwania dla: swimbladder

• Study of swimbladder morphometry of Baltic herring and sprat (development of measurement methodology)

  Publikacja

  • J. Idczak
  • N. Gorska
  • B. Arciszewski

  - HYDROACOUSTICS - Rok 2011

  Effective management of Baltic clupeids, which are valuable commercially and ecologically,requires the biomass control. The acoustical techniques are recognized as effective in fishstock assessment. The study of Baltic herring and sprat individual backscatteringcharacteristics is required for the accurate biomass estimation using acoustical techniques.The previous measurements demonstrated significant...

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• X-ray images of Baltic herring

  Dane Badawcze

  open access

  • J. Idczak

  A methodology for studying the geometric shape of Baltic herring swimbladders including the optimal way of catching, transporting and storing fish, the X-ray measurements and the X-ray image analysis, that does not change the natural shape of the fish swimbladder was developed. Fish for research was obtained in the area of ​​the Polish coastal zone...

• Backscattering properties of southern Baltic herring

  Publikacja

  • J. Idczak
  • N. Kniaź-Kubacka

  - HYDROACOUSTICS - Rok 2012

  Reliable TS(L) relationship is required to improve acoustic algorithms of abundanceestimation of Baltic herring. The relationships, empirically obtained in different parts of theBaltic Sea, produce up to 8 dB – difference in the herring TS. In order to develop an accurateTS(L) relationship, it is important to analyze factors controlling the TS variability. Thepossible impact of the regional difference...

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