Rank the following fishes, from most to least, in terms of the amount of energy it must use to maintain its position (depth)in the water column over the long term. 1. physoclistus fish
2. physostomus fish
3. chondrichthyan fish
A)1, 2, 3
B)2, 3, 1
C)2, 1, 3
D)3, 1, 2
E)3, 2, 1

Question

Quizplus · Accepted Answer

Physostomus fish have a swim bladder that is connected to the digestive tract, which allows them to adjust their buoyancy by swallowing or expelling air. This requires less energy than physoclistus fish, which have a closed swim bladder that must be filled or emptied by a gas gland. Chondrichthyan fish have a cartilaginous skeleton and a liver that is filled with oil, which provides buoyancy. This requires the least amount of energy to maintain position in the water column.

Rank the Following Fishes, from Most to Least, in Terms