Keeltail needlefish have gill - rakers , their caudal peduncles have lateral keels , with a lateral line running ventral to it .
Keeltail needlefish grow up to 50 cm long The keeltail needlefish 's top jaw is also smaller than the lower one .
Keeltail needlefish have gill - rakers , their caudal peduncles have lateral keels , with a lateral line running ventral to it , and grow up to 50 cm long The keeltail needlefish 's top jaw is also smaller than the lower one .