Archivos de diario de marzo 2021

07 de marzo de 2021

Lake Erie Fish Ageing Project

The purpose of this project is to demonstrate fish ageing techniques. Using the crack and burn method, otoliths were “flamed” using a zippo lighter carefully with the blue part of the flame lower to the chimney to avoid scorching and soot. A clean burning fuel is needed to avoid charring and soot. Alcohol did not burn long enough and a standard lighter flame or orange flame had poor results. The otoliths were then embedded in Crayola modeling clay and submerged in canola oil.

Then viewed and photographed using a stereo microscope.

Scales were viewed and photographed using a stereo microscope.

Counting the annuli on both the scales and otoliths, the age of the fish can then be determined.

Project can be found here;

https://www.inaturalist.org/projects/lake-erie-fish-ageing-project

Please feel free to leave a comment on what age you think these fish could be.
All scales and otoliths were collected with guidance and permission under MNRF guidance.

Ingresado el 07 de marzo de 2021 por bert_raccoon bert_raccoon | 0 comentarios | Deja un comentario