2007-08-19 11:11:42 · 5 answers · asked by Clifford W 1 in Pets ➔ Fish
Usually by its size in relation to its species and the environment it lives in.For example a very large goldfish could be 5 or 6 years old and 12 inch's long if it lives in a pond but the same fish would be only a couple of inch's if it lives in a fishbowl. A shark living in the ocean could be 4 ft long at 3 months old.
2007-08-19 11:25:35 · answer #1 · answered by ec1177 5 · 0⤊ 0⤋
Depending on the fish find out what thier full grown size is and then you need to determine their life span and then go from there!!
2007-08-19 11:20:51 · answer #2 · answered by Kyle S 4 · 0⤊ 0⤋
Count the growth rings on their scales if you have a microscope.
2007-08-19 11:19:52 · answer #3 · answered by PeeTee 7 · 0⤊ 0⤋
The smell?
2007-08-19 11:23:39 · answer #4 · answered by Tim M 1 · 0⤊ 0⤋
http://www.iphc.washington.edu/staff/joan/otolith.HTM
http://www.marinebiodiversity.ca/otolith/english/determine.htm
try these sites out.
2007-08-22 09:52:08 · answer #5 · answered by spa_anderson 1 · 0⤊ 0⤋