2006-09-23 17:28:25 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
You need to count the growth rings on cycloid or ctenoid scales.
http://www.amonline.net.au/fishes/what/scales/index.htm
2006-09-23 17:36:39 · answer #1 · answered by icrashalot 4 · 0⤊ 0⤋
i think when u aged together wit the fish by the time u bought it
2006-09-24 00:39:23 · answer #2 · answered by lenaroza 1 · 0⤊ 0⤋
If it smells like rotten fish, then it is probably old, throw it out.
2006-09-24 00:37:26 · answer #3 · answered by Quin S 3 · 0⤊ 0⤋
im not too sure but i think its around the same time when it gets wrinkles and liver spots and when it falls it cant get up on its own
2006-09-24 00:31:51 · answer #4 · answered by Anonymous · 0⤊ 0⤋
He floats on top of the water.
2006-09-24 00:29:22 · answer #5 · answered by Anonymous · 0⤊ 0⤋
If he is floating on the top of the tank.
2006-09-24 01:12:25 · answer #6 · answered by rltouhe 6 · 0⤊ 0⤋
See if he knows these songs? If he does, He's very old
⥠http://70.37.25.206:8000 â¥
2006-09-24 00:35:33 · answer #7 · answered by myothernewname 6 · 0⤊ 0⤋
From the eyes Look at my eyes babe. look at the eyes if they look fresh then it is fresh.
2006-09-24 00:31:05 · answer #8 · answered by santa s 4 · 0⤊ 0⤋
wrinkled?
2006-09-24 00:36:02 · answer #9 · answered by yoodge 4 · 0⤊ 0⤋