Tolerance of Barbonymus schwanenfeldii under sulfide exposure

Azimah, binti Apendi and Ling, Teck Yee and Lee, Nyanti and Sim, Siong Fong and Jongkar, Anak Grinang and Lee, Karen Suan Ping and Tonny, Ganyai (2018) Tolerance of Barbonymus schwanenfeldii under sulfide exposure. AACL Bioflux, 11 (5). pp. 1574-1586. ISSN 1844-9166

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Hydrogen sulfide, a common occurrence in hydroelectric dam environment, is potentially toxic to living organisms in the environment. However, studies on the response of indigenous fish species when exposed to sulfide are still lacking in literature. Thus, behavioral responses and mortality of an indigenous fish species, Barbonymus schwanenfeldii, were determined in the laboratory where juveniles were exposed to different concentrations of sulfide. Three experiments were conducted during the exposure, namely, gradual sulfide exposure, sulfide exposure under lowering DO condition and gradual sulfide exposure under lowering pH condition. Methylene blue method was used to analyze the water for actual total sulfide concentrations. Behavioral responses, dissolved oxygen level and pH were taken and recorded. Four behavioral responses observed in sulfidic water were huddling, aquatic surface respiration, loss of equilibrium and mortality. However, in negative control no such responses were observed during the duration of the experiment. As the sulfide concentration increased, the time taken to the occurrence of behavioral responses decreased indicating increased toxicity. The LC50 at 6 h was estimated as 507.8 µg L -1 total sulfide (490 µg L -1 H2S) at 95% confidence level. Under sulfide exposure in lowering pH condition, mortality was significantly faster than the other two experimental conditions. This study shows that juveniles showed behavioral response to all sulfide concentrations tested and lowering both DO and pH levels increased the sulfidic toxicity as they led to faster mortality of juveniles. Key Words: huddling, aquatic surface respiration, loss of equilibrium, toxicity, mortality.

Item Type: Article
Uncontrolled Keywords: huddling, aquatic surface respiration, loss of equilibrium, toxicity, mortality, unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education, research, Universiti Malaysia Sarawak.
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > Q Science (General)
S Agriculture > SH Aquaculture. Fisheries. Angling
Divisions: Academic Faculties, Institutes and Centres > Faculty of Resource Science and Technology
Depositing User: Gani
Date Deposited: 14 Dec 2018 03:20
Last Modified: 16 Jul 2019 02:06

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