Please enable JavaScript.
Coggle requires JavaScript to display documents.
Fish age, In general, denser or thicker layers of material are formed…
Fish age
Age determination
-
Otolith
Sagittal otolith bones (sagittae) –middle ear behind and to the sides of the brain
Also part of the balance and hearing systems for fish.
-
Method to estimate age
Anatomical structure.
-Also known as hard part analysis
-Number of spacing and annual marks on a part of the animal that is retain throughout its life
-
Length frequency distribution-
-Lengths are taken from a large random sample of a population
-Number of individuals caught are plotted against length
-The resulting plot should reveal clusters indicating year classes, beginning with year zero.
-
-
In general, denser or thicker layers of material are formed during periods of fast growth and less dense, thinner layers are formed during periods of slower growth.