Comparative study of available spawning methods of the giant clam Tridacna squamosa [Bivalvia: Tridacnidae] in Makogai, Fiji

Singh, Navneel K. and Azam, Khairul (2013) Comparative study of available spawning methods of the giant clam Tridacna squamosa [Bivalvia: Tridacnidae] in Makogai, Fiji. World Journal of Fish and Marine Sciences, 5 (3). pp. 353-357. ISSN 2078-4589

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Abstract

In this present study, the intra-gonadal injection of serotonin, heat stress and macerated gonads methods were compared to determine the best method of induced spawning in terms of lowest larval mortality rate in Tridacna squamosa. Broodstock were induced to spawn using the three methods. The gametes were collected, fertilized and stocked (10 larvae/ml) into larval rearing tanks to monitor percentage mortality of the different treatments. Larvae were fed twice with the zooxanthellae during the veliger stage. The addition of zooxanthellae was decreased significantly (P 0.05) the mortality in Tridacna squamosa. Initial mortality of the clams was significantly higher than before the first and second additions of zooxanthellae; however, there was no significant difference (P 0.05) between the first and second additions of zooxanthellaes. The macerated gonads, heat stress and serotonin methods of induced spawning differed significantly (P 0.05) with mean value of (6657.56±2766.527%), (7355.56±3045.012%) and (8979.56±3641.121%) respectively. High mortality in the veliger stage (48 hrs post fertilization) may have been caused by bacterial infection. Addition of zooxanthellae was seen as an important procedure especially when feeding was not done in the hatchery phase of giant clam larvae production. Thus, the best method of spawning in terms of lowest mortality rate was macerated gonads followed by heat stress and serotonin respectively

Item Type:	Journal Article
Uncontrolled Keywords:	Tridacna squamosa Serotonin Heat Stress Macerated Gonad
Subjects:	S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions:	Faculty of Science, Technology and Environment (FSTE) > School of Marine Studies
Depositing User:	Unnamed user with email khairul.azam@usp.ac.fj
Date Deposited:	20 Dec 2013 02:28
Last Modified:	06 Jul 2016 23:43
URI:	http://repository.usp.ac.fj/id/eprint/7080

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