Give an account of accessory respiratory structures in fishes with a note on their biological significance. (UPSC 2018, 15 Marks, )

मछलियों में सहायक श्वसन संरचनाओं का वर्णन करें और उनकी जैविक महत्व पर एक टिप्पणी लिखें। (Give an account of accessory respiratory structures in fishes with a note on their biological significance.)

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Give an account of accessory respiratory structures in fishes with a note on their biological significance. (UPSC 2018, 15 Marks, )