Zebrafish have fusiform, laterally compressed bodies that reach an average length of 25 mm. The largest recorded zebrafish reached 64 mm in captivity. They have centrally located eyes and thin elongate mandibles with a protrusive lower jaw that causes the mouth to point upwards. Like other cyprinids, zebrafish are stomachless and toothless. As a result, they rely on gill rakers to break up food. Additionally, they are obligate suction feeders. Zebrafish have several defining features including an incomplete lateral line, two pairs of barbels, and several (usually 5 to 7) longitudinal stripes along the sides of their body. The degree of sexual dimorphism in zebrafish is minimal, as males tend to have more yellow coloration and tend to have larger anal fins than females.
Range length: 64 (in captivity) (high) mm.
Average length: 25 mm.
Other Physical Features: ectothermic ; heterothermic ; bilateral symmetry
Sexual Dimorphism: male more colorful; sexes shaped differently
- Albertson, R., T. Kocher. 2006. Genetic and developmental basis of cichlid trophic diversity. Heredity, 97: 211-221.