Ontogeny of the freshwater goby Odontobutis hikimius in an aquarium
2006
Doi, T.(Kobe-shi. Suma Aqualife Park (Japan)) | Aoyama, S.
Embryonic, larval and juvenile morphologies of the freshwater goby Odontobutis hikimius, reared in an aquarium, were observed and described. The egg mass (ca. 200 eggs), spawned on the glass wall of the tank, were cared for by the male. The eggs were ellipsoid in shape, 3.74-3.80 mm (10ng axis) by 2.20-2.35 mm (short axis), and attached to the glass wall with adhesive threads. Larvae hatched out l4-16 days after spawning. Just-hatched larvae were 6.04-6.11 mm in body length (BL), with 1 8 + 12=30 myomeres, completed notochord flexion, and all fins represented. However fin ray numbers were not completed. Melanophores were present on the head cheek, trunk below the first and second dorsal fins, and caudal peduncle. Eleven days after hatching, juveniles of ca. 8.45-8.75 mm BL had full fin ray complements. They grew to ca. 11-12 mm BL after one month from hatching, ca. 50-60 mm BL after 6 months and ca. 70-115 mm BL after one year. The cephalic sensory papillae developed in 11 -day-old juveniles at ca. 8.6 mm BL. Opercular papillae group 17 was clearly connected with group 19 over ca. 11 mm BL, such being an important character for distinguishing adults of this species from similarly-sized O. obscura. Sensory canal c was apparent in specimens over ca. 70 mm BL.
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