Which outcome occurs when the swim bladder duct of a physostomous fish becomes obstructed?

💡 Explanation

When the swim bladder duct is obstructed, the fish cannot gulp air to inflate and deflate the swim bladder through pneumatic duct, disrupting the buoyancy regulation mechanism resulting from changes in water pressure. Therefore reduced buoyancy control capabilities occur, rather than infection, increased oxygen consumption or decreased temperature regulation as those depend on other mechanisms.

• Which adaptation minimizes energy expenditure during thermal soaring?
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