JAMB - Biology (2000 - No. 4)
The set of fins that control steering, balancing and change of direction and pitch in fish is
dorsal and anal
pectoral and pelvics
caudal and dorsal
anal and pelvics
คำอธิบาย
In a fish, the pelvic fin rays are the bones forming the fin beneath the pelvic girdle, the pectoral fin rays are the bones forming the chest fin and the pelvic girdle are the set of bones forming the pelvis. They are used for controlling steering, balancing, and changing the direction of the fish.