Pelvic fins are absent in which of the following families?

Correct option is D

Correct Answer: (d) Stromateidae
Explanation:
→ Members of the family Stromateidae (butterfishes/pomfrets) typically lack pelvic fins, a key distinguishing morphological feature.
→ Their streamlined, deep-bodied shape is adapted for efficient swimming in open waters.
→ Absence of pelvic fins gives them a smooth, uninterrupted ventral profile.
Information Booster:
→ Stromateids include commercially important fishes such as Pampus spp.
→ They possess a unique stomatopod-like gizzard for grinding food.
→ Primarily marine, inhabiting tropical and subtropical waters.
Additional Information (Other Options):
(a) Carangidae: Trevallies; pelvic fins present.
(b) Cyprinidae: Carps; pelvic fins present.
(c) Polynemidae: Threadfins; pelvic fins present and modified into long filaments.