Embryonic and Larval Development of the Giant Clam Tridacna noae (Röding, 1798) (Cardiidae: Tridacninae)

Paul C Southgate; Richard D Braley; Thane A Militz

doi:10.2983/035.035.0406

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Embryonic and Larval Development of the Giant Clam Tridacna noae (Röding, 1798) (Cardiidae: Tridacninae)

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Embryonic and Larval Development of the Giant Clam Tridacna noae (Röding, 1798) (Cardiidae: Tridacninae)

Paul C Southgate, Richard D Braley and Thane A Militz

Journal of Shellfish Research, Vol.35(4), pp.777-783

2016

DOI: https://doi.org/10.2983/035.035.0406

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Abstract

giant clam Tridacna noae

Tridacninae

embryology

larval development

Papua New Guinea

This paper reports on embryonic and larval development of the giant clam Tridacna noae. Spawning was induced by serotonin injection into the gonad. Unfertilized eggs had a mean (±SE) diameter of 101.14±0.47 mm and spermatozoa heads were 8.92±0.09 mmlong. Embryonic development had progressed to the 8-cell and 16-cell stages by 3 h postfertilization and to the 32-cell stage by 4 h postfertilization. Rotating gastrulae accounted for 82% of developing embryos at 9 h postfertilization. Trochophore larvae accounted for 54% of embryos at 16 h postfertilization, and 98% of larvae at 20 h postfertilization. Straighthinged (D-stage) veligers comprised 74% of developing larvae at 22 h postfertilization with mean (±SE) anteroposterior measurement (APM) of 146.32±0.58 mm, dorsoventral measurement (DVM) of 118.12±0.74 mm, and hinge length of 77.46±0.73 mmat 24 h postfertilization. At 96 h postfertilization, 74% of veligers had settled but had retained the velum without showing development of the foot and, by 120 h postfertilization, 78% of settled veligers had become pediveligers with a probing foot. The mean (±SE) APM of pediveligers at 144 h postfertilization was 176.50±0.97 mm, DVM was 151.86±1.01 mm, and hinge length was 63.50±0.95 mm. Gills were first observed in settled individuals 11 days after fertilization, indicating completion of metamorphosis. The methods used in this study supported successful larval culture of T. noae and provide a basis for large-scale propagation of this species.

Details

Title: Embryonic and Larval Development of the Giant Clam Tridacna noae (Röding, 1798) (Cardiidae: Tridacninae)
Authors: Paul C Southgate (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Richard D Braley (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Thane A Militz (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
Publication details: Journal of Shellfish Research, Vol.35(4), pp.777-783
Publisher: National Shellfisheries Association, Inc.
Date published: 2016
DOI: 10.2983/035.035.0406
ISSN: 0730-8000
Organisation Unit: School of Science and Engineering - Legacy; Australian Centre for Pacific Islands Research; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99451052402621
Output Type: Journal article

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