COSTECH Integrated Repository

Effects of Elevated Carbon Dioxide and Temperature on Survival and Morphology of Japanese Whiting Sillago Japonica

Show simple item record

dc.creator Yona, G.
dc.creator Madalla, Nazael
dc.creator Mwandya, Augustine W.
dc.creator Ishimatsu, A.
dc.creator Bwathondi, Philip O. J.
dc.date 2016-09-21T11:30:33Z
dc.date 2016-09-21T11:30:33Z
dc.date 2016
dc.date.accessioned 2018-03-27T08:24:08Z
dc.date.available 2018-03-27T08:24:08Z
dc.identifier Yona, G., Madalla, N., Mwandya, A., Ishimatsu, A. and Bwathondi, P., 2016. Effects of elevated carbon dioxide and temperature on survival and morphology of Japanese whiting Sillago japonica.
dc.identifier 2347-5129
dc.identifier http://hdl.handle.net/20.500.11810/3758
dc.identifier.uri http://hdl.handle.net/20.500.11810/3758
dc.description The objective of the present study was to examine the effect of elevated CO2 and temperature on survival and morphology of Sillago japonica yolk sac larvae under the Institute for East China Sea Research (ECSER) Nagasaki, Japan. In this study, we examined hatching success, survival and morphology of the larvae of Sillago japonica under four conditions: control (C), seawater pCO2 382µatm, temperature 27 °C; high CO2 (HC), 915µatm, 27 °C; high temperature (HT), 385 µatm, 31 o C; and high CO2+high temperature (HCT), 932µatm, 31 o C. Fertilized eggs were obtained from broodstock reared in natural seawater, and transferred to experimental containers in each treatment. Hatched larvae were observed until the completion of yolk sac absorptions on 3 days post hatching (dph). The experiment was repeated four times with 4 replicates for each treatment in each experiment. Also, the temperature appeared to have exerted a stronger influence on hatching success (Hs) and larval survival (Sv): Hs and Sv at 3 dph were both significantly (p>0.05) depressed in HT (Hs 52.5±1.25%, Sv 23.8±4.38%) and HCT (Hs 51.3±3.13%, Sv 20.0±0.63%) treatments than in C (Hs 98.1±0.94%, Sv 74.4±2.03%) and HC (Hs 95.0±2.5%, Sv 49.7±3.44%) treatments. In contrast, CO2 was the predominant factor responsible for morphological abnormality: percentage morphological abnormality was significantly (p>0.05) higher in HC (15.8±2.72%) and HCT (41.0±10.86%) treatments than in C (0.4±0.65%) and HT (2.4±2.40%) treatments. Most individuals in HC and HCT treatments had body axis either curved or bent, with aberrant swimming behavior. These results indicate that projected future ocean environments will have significant negative impacts on hatching success, and larval survival and morphology of S. japonica, which might have serious ramifications for recruitment of the species. Comparative studies on other teleost and elasmobranch species are critically needed.
dc.language en
dc.subject Elevated carbondioxide
dc.subject Marine fish larvae
dc.subject Sillago japonica
dc.subject Survival and morphology
dc.subject Temperature
dc.title Effects of Elevated Carbon Dioxide and Temperature on Survival and Morphology of Japanese Whiting Sillago Japonica
dc.type Journal Article


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search COSTECH


Advanced Search

Browse

My Account