Assessment of Temperature Effects on Early Larval Development Survival of Hatchery-reared Tropical Oyster, Crassostrea iredalei.

Chiew Peng Teh Chiew Peng,Aileen Shau Hwai Aileen Tan Shau Hwai,Thiyagarajan Thiyagarajan Vengatesen

doi:10.21315/tlsr2016.27.3.15

Chiew Peng Teh Chiew Peng, Aileen Shau Hwai Aileen Tan Shau Hwai + Show 1 more

Open Access

https://doi.org/10.21315/tlsr2016.27.3.15

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Abstract

The influence of the cool and warm temperatures on early life development and survival of tropical oyster, Crassostrea iredalei was studied. D-hinged larvae (day 1 larvae) were reared to three different temperatures (20°C, 27°C, and 34°C) for nine days. Oyster larvae reared in temperature 27°C, acted as control (ambient temperature). The highest survival rate occurred when the larvae were reared in 20°C and 27°C. Larvae reared at 34°C exhibited reduced survival but increase in the growth rate. The growth rate in larvae reared in high temperature (34°C) was significantly higher compared to larvae reared in 20°C and 27°C (p<0.05). The results from the present study indicated that tropical oyster larvae, C. iredalei had faster growth rate at the high temperature (34°C). However, the larval survival was decreasing according to days. There is no significant difference in the larval growth and survival in lower temperature (20°C) and control condition (27°C).

Highlights

Tropical oyster, Crassostrea iredalei has been commercially culture in most of the oyster farms in Southeast Asia countries such as Malaysia, Thailand, Philippines, and Vietnam
The growth rate in larvae reared in high temperature (34°C) was significantly higher compared to larvae reared in 20°C and 27°C (p
The results from the present study indicated that tropical oyster larvae, C. iredalei had faster growth rate at the high temperature (34°C)

Summary

Introduction

Crassostrea iredalei has been commercially culture in most of the oyster farms in Southeast Asia countries such as Malaysia, Thailand, Philippines, and Vietnam. As an intertidal and tropical species, the tropical oyster, C. iredalei is able to tolerate to varying abiotic conditions. The temperature range for survival and growth of this tropical oysters has not been evaluated. There is an increase in demand for hatchery produced oyster spat lately. The global warming and increase of seawater temperature rise

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