Impact of short-term salinity and turbidity changes on hatching and survival rates of Japanese sea cucumber Apostichopus japonicus (Selenka 1867) eggs

Yoshimatsu Takao, . and Manuel Albert Valdish, . and Cam Tu Phan Thi, . and Huynh Giang Truong, . and Tsutsui Naoaki, . Impact of short-term salinity and turbidity changes on hatching and survival rates of Japanese sea cucumber Apostichopus japonicus (Selenka 1867) eggs. pp. 90-94. ISSN 2073-3720

The increased frequency and intensity of extreme rainfall events attributed to global climate change could lead to changes in salinity and turbidity levels in coastal waters which may negatively impact the survival of organisms particularly during the early developmental stages. In this study the influences of salinity and turbidity on the early life stage of Japanese sea cucumber Apostichopus japonicus (Selenka 1867) were studied in a series of small-scale laboratory experiments. During the first half of the experiments A. japonicus fertilised eggs were exposed to various levels of salinity stresses (34: control 30 26 22 18 14 PSU) for a single period of 3 h. In the second half of the experiments following the same duration as the first experiment fertilised eggs were exposed to different levels of turbidity 0 (control) 100 300 500 and 700 NTU. The results showed that the hatching and survival rates significantly decreased as salinity dropped. As for turbidity there were significant adverse effects on hatching and survival rates of A. japonicus. This study shows that short-term low salinity and high turbidity influenced events could potentially reduce larvae survival of A. japonicas. These factors could affect the robustness of future adult populations.

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Abstract

The increased frequency and intensity of extreme rainfall events attributed to global climate change could lead to changes in salinity and turbidity levels in coastal waters which may negatively impact the survival of organisms particularly during the early developmental stages. In this study the influences of salinity and turbidity on the early life stage of Japanese sea cucumber Apostichopus japonicus (Selenka 1867) were studied in a series of small-scale laboratory experiments. During the first half of the experiments A. japonicus fertilised eggs were exposed to various levels of salinity stresses (34: control 30 26 22 18 14 PSU) for a single period of 3 h. In the second half of the experiments following the same duration as the first experiment fertilised eggs were exposed to different levels of turbidity 0 (control) 100 300 500 and 700 NTU. The results showed that the hatching and survival rates significantly decreased as salinity dropped. As for turbidity there were significant adverse effects on hatching and survival rates of A. japonicus. This study shows that short-term low salinity and high turbidity influenced events could potentially reduce larvae survival of A. japonicas. These factors could affect the robustness of future adult populations.

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Item Type:	Article
AGROVOC Term:	Sea cucumbers
AGROVOC Term:	Stichopodidae
AGROVOC Term:	Animal embryos
AGROVOC Term:	Egg hatching
AGROVOC Term:	Turbidity
AGROVOC Term:	Salinity
AGROVOC Term:	Embryonic development
AGROVOC Term:	Survival
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/10610

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