Structure and development of free neuromasts in barramundi, lates calcarifer (block)

Mukai, Yukinori and Liy, Lang Chai and Muhamad Shaleh, Sitti Raehanah and Senoo, Shigeharu (2007) Structure and development of free neuromasts in barramundi, lates calcarifer (block). Zoological Science, 24 (8). pp. 829-835. ISSN 0289-0003 (P)

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Abstract

This study was conducted to clarify the development of free neuromasts with growth of the barramundi, Lates calcarifer. A pair of free neuromasts was observed behind the unpigmented eyes in newly hatched eleutheroembryos with a mean total length of 1.93 mm, and two-hour-old eleutheroembryos could respond to an approaching pipette. At 2 days after hatching, the egg yolk sac was mostly consumed, the eyes were pigmented, and the larvae commenced feeding on rotifers. Free neuromasts increased in number with growth and commenced developing into canal neuromasts in barramundi 15 days old with a mean total length of 8.07 mm. The average length of the major axis of the trunk free neuromasts attained approximately 12.9–15.5 μm, and the number of sensory cells was 15.4–17.5 at 15–20 days old. Developed cupulae of free neuromasts were observed in 1-day-old eleutheroembryos. The direction of maximum sensitivity of free neuromasts, determined from the polarity of the sensory cells, coincided with the minor axis of the lozenge-shaped outline of the apical surface of the free neuromasts. The polarity of trunk neuromasts was usually oriented along the antero-posterior axis of the fish body, but a few had a dorso-ventral direction. On the head, free neuromasts were oriented on lines tangential to concentric circles around the eye.

Item Type:	Article (Journal)
Additional Information:	6616/7719
Uncontrolled Keywords:	free neuromasts, lateral line, eleutheroembryos, larvae, barramundi, Asian seabass, Lates calcarifer
Subjects:	Q Science > Q Science (General) Q Science > QL Zoology
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Institute of Oceanography and Maritime Studies
Depositing User:	Dr. Yukinori Mukai
Date Deposited:	11 May 2012 15:19
Last Modified:	11 May 2012 15:19
URI:	http://irep.iium.edu.my/id/eprint/7719

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