Organ health and development in larval kingfish are unaffected by ocean acidification and warming

Frommel, Andrea Y., Brauner, Colin J., Allan, Bridie J.M., Nicol, Simon, Parsons, Darren M., Pether, Steve M.J., Setiawan, Alvin N., Smith, Neville, and Munday, Philip L. (2019) Organ health and development in larval kingfish are unaffected by ocean acidification and warming. PeerJ, 7. e8266.

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Abstract

Anthropogenic CO₂ emissions are causing global ocean warming and ocean acidification. The early life stages of some marine fish are vulnerable to elevated ocean temperatures and CO₂ concentrations, with lowered survival and growth rates most frequently documented. Underlying these effects, damage to different organs has been found as a response to elevated CO₂ in larvae of several species of marine fish, yet the combined effects of acidification and warming on organ health are unknown. Yellowtail kingfish, Seriola lalandi, a circumglobal subtropical pelagic fish of high commercial and recreational value, were reared from fertilization under control (21 °C) and elevated (25 °C) temperature conditions fully crossed with control (500 µatm) and elevated (1,000 µatm) pCO₂ conditions. Larvae were sampled at 11 days and 21 days post hatch for histological analysis of the eye, gills, gut, liver, pancreas, kidney and liver. Previous work found elevated temperature, but not elevated CO₂, significantly reduced larval kingfish survival while increasing growth and developmental rate. The current histological analysis aimed to determine whether there were additional sublethal effects on organ condition and development and whether underlying organ damage could be responsible for the documented effects of temperature on survivorship. While damage to different organs was found in a number of larvae, these effects were not related to temperature and/or CO₂ treatment. We conclude that kingfish larvae are generally vulnerable during organogenesis of the digestive system in their early development, but that this will not be exacerbated by near-future ocean warming and acidification.

Item ID: 61367
Item Type: Article (Research - C1)
ISSN: 2167-8359
Keywords: CO₂, pH, temperature, commercial fish, Seriola lalandi, histology, climate change, environmental impacts, larval development, aquaculture
Copyright Information: © 2019 Frommel et al.
Funders: New Zealand Government, Principality of Monaco, The Pacific Community, Australian Research Council (ARC), ARC Centre of Excellence for Coral Reef Studies, National Institute of Water and Atmospheric Research
Projects and Grants: Pacific Islands Ocean Acidification Partnership (PIOAP), ARC FT130100505
Date Deposited: 08 Jan 2020 07:33
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960305 Ecosystem Adaptation to Climate Change @ 100%
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