The development of light organ and bacterial infection in slip-mouths (Leiognathidae)

Tay, Kean Boon (2005) The development of light organ and bacterial infection in slip-mouths (Leiognathidae). Universiti Malaysia Sabah. (Unpublished)


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To date, there are no previous studies to describe the development of the light organ in slip-mouths and at the stage at which bacterial infection occurs. Thirty four juveniles of Leiognathus rapsoni, a new record for Sabah, were captured by using modified triple layering gill net at Karambunai Lagoon (NE 06�04' 39.5", E 116� 06' 59.7") for this investigation. Six juveniles of Leiognathus splendens were bought from roadside along Jalan Sulaman for culturing the bacterial presence in a leiognathid. Light organs from six of L. rapsoni (3.8 to 5.2 cm SL) were histologically examined. Results show that the light organ increases in height, width and thickness with increasing size of the leiognathids (3.8 to 5.2 cm SL). Furthermore, the pattern of development of the light organs might develop in two different ways. There are single sided growing pattern with a ring-liked surrounding, and dual sided growing pattern with a croissant-liked surrounding. All L. splendens juveniles (6.9 to 7.9 cm SL) have bacteria, P. leiognathi, that are gram negative. It is apparent from the results that the light organ in L. rapsoni develops and gets infected by P. leiognathi in individuals smaller than 3.8 cm. Since luminous bacteria can be bioindicators of the water quality, these findings indicate that the Karambunai Lagoon is not polluted by toxicants.

Item Type: Academic Exercise
Uncontrolled Keywords: bacterial infection, slip-mouth, light organ, development, leiognathid, bioindicator
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: SCHOOL > School of Science and Technology
Date Deposited: 12 Mar 2014 03:00
Last Modified: 12 Oct 2017 06:09

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