NEET BIOLOGY

Detailed explanation-1: -The correct answer is option 4 i.e Cartilaginous Fish . Swim bladder is a buoyancy organ possessed by most bony fishes .

Detailed explanation-2: -But in trout and salmon, the swim bladder is connected to the esophagus, making it possible to squeeze excess air out. To do so, hold the fish gently on its side and gently, but firmly, squeeze the belly from the vent toward the head. You will be able to hear the burp as air is expelled from the bladder.

Detailed explanation-3: -Bony fish have a specialized organ called a swim bladder. The purpose of this organ is to contain oxygen and gases to maintain neutral buoyancy at the fish’s desired depth, similar to a diver’s buoyancy compensation device (BCD).

Detailed explanation-4: -Swim bladder or air bladder is found only in bony fishes. It is a sac-like outgrowth from the dorsal wall of the oesophagus. It is hydrostatic in function and in some cases respiration as well. It provides bouncy to the fishes and helps them in swimming.

Detailed explanation-5: -Depending on the presence of the duct (ductus pneumaticus) between the swim-bladder and the oesophagus, the swim-bladder in fishes can be divided into two broad categories: Physostomous [Gk. physi = a bladder; stomata, mouth] and Physoclistous types [Gk. clistic = enclosed].