Students discover the process where fish otoliths are extracted and analysed to determine the age of the fish. Students will practice ageing fish using photographs of black bream sectioned otoliths and Australian herring whole otoliths.
In southern Australia, the western blue groper is actually the largest carnivorous bony fish species found living on reefs, reaching a length of up to 1.7 m and a weight of up to 40 kg. Learn more about the biology
Western Fisheries article by Dr Jill St John, Summer 2003/04, pg. 43
Students will learn why fisheries scientists dissect fish and what information can be found from examining the external and internal structure of a fish. Students then carry out their own fish dissection, where they will get to extract the ear bones, or otoliths, from their fish. All data collected will contribute to true stock assessment data.
View slides of whole Australian herring otoliths to determine the age of each fish. This presentation is a resource related to the 'What's My Age Again?' Lesson Plan.
View sectioned slides of Black bream otoliths to determine the age of each fish. This presentation is a resource related to the 'What's My Age Again?' Lesson Plan.