Vol. 60, 2021
(update: 2021.06.18; 09.07)
Reproduction and Early Juvenile
Growth of the Giant Clams Tridacna
noae and Tridacna maxima
and Li-Lian Liu4,5,*
Agency, Council of Agriculture, Executive Yuan, Taipei, Taiwan. E-mail:
2Department of Aquaculture, National Penghu University
of Science and Technology, Penghu 880, Taiwan. *Correspondence: E-mail:
3Department of Aquaculture, National Kaohsiung
University of Science and Technology, Kaohsiung 811, Taiwan. E-mail:
4Department of Oceanography, National Sun Yat-sen
University, Kaohsiung 804, Taiwan. *Correspondence: E-mail:
firstname.lastname@example.org (Liu). E-mail: email@example.com (Soong)
5NSYSU Frontier Center for Ocean Science and
Technology, National Sun Yat-sen University, Taiwan, Kaohsiung 804,
Received 29 June 2020 / Accepted 31
Communicated by Benny K.K. Chan
The reproductive cycle, larval
development, and juvenile growth of Tridacna
noae and Tridacna maxima
were investigated to improve their hatchery production for conservation
and commercial use in Taiwan. To study the giant clam reproductive
cycle, hypodermic extraction of oocytes from T. noae and T. maxima was
conducted in Dongsha and Kenting, Taiwan, from March 2013 to May 2014;
ripe eggs were observed in both species from March to August. There was
no apparent correlation between reproduction and water temperature.
Artificial fertilization was successfully conducted in T. maxima, T. noae, and a hybrid of T. maxima♀/T. noae♂.
The diameter of fertilized eggs was 99.0 ?8.1, 113.8 ?18.5, and 116.3
?6.2 μm, respectively. On day 6, the hybrid died. Tridacna maxima grew
more than T. noae in both 1- and 10-month-old juveniles. The
juvenilegrowth of T. noae
was compared between the artificial breeding sites of Penghu and
Linbian, which represent the main ornamental aquatic animal culture
areas of Taiwan. Starting with individuals with a shell length of 15.9
?2.5 mm (265 days old), the juveniles observed in Linbian were
significantly larger than those in Penghu, i.e., 26.6 ?3.6 mm on day 307 vs.
18.6 ?2.9 mm on day 321 (p
< 0.001). This might be linked to the differences in local water
temperatures between the two locations, i.e., 20.3–27.0oC vs.
respectively. These results can be used to further research ways to
maximize spat production and minimize giant clam operational costs.
Key words: Reproductive cycle,
Hybrid, Larval development, Temperature, Dongsha, Kenting.
Citation: Su PW, Zhang GL, Chen PN, Soong
K, Liu LL. 2021. Reproduction and Early Juvenile Growth of the Giant
Clams Tridacna noae and Tridacna maxima in Taiwan. Zool