The Extinction Protocol blog today covers the story about mass fish death in deep South Atlantic originaly posted in The Islander. Over the last few weeks we have been recording high numbers of dead fish washing up onto the beaches around the Island. The same thing happened, at the same time of year, in 2008. A report was published recently, called ‘Reef fish mass mortality event in an isolated island off Brazil, with notes on recent similar events at Ascension, St Helena and Maldives’ by Hudson Pinheiro, Joao Gasparini and Jean-Christophe Joyeux. The report states that ‘it is possible that blooms of toxic algae, under certain conditions, caused cascading intoxication along the trophic web. Toxic algae occur in other Atlantic oceanic islands and there are reports of algal blooms occurring in remote areas that suffer low human impact.
A second hypothesis is that seasonal upwelling events of anoxic or hypoxic waters may be involved (the low oxygen content would be due to the resuspension of sediment and organic matter deposited at geological scales) often heavily loaded with hydrogen sulphide. Oxygen-poor waters of the Benguela upwelling have been reported to affect the southeastern Atlantic continental shelf and these waters, in years of strong Benguela upwelling, can even reach the Mid-Atlantic Ridge island of St Helena.’
The full report is available to download at The Islander Conservation Office. We are currently consulting with contacts in the UK and Falklands. I have sent them as much information as I have, including species affected, numbers, symptoms and photographs. They will be able to offer advice on the best course of action.
If you value what we do here, open your ad-free account and support our journalism.
Producing content you read on this website takes a lot of time, effort, and hard work. If you value what we do here, select the level of your support and register your account.
Your support makes this project fully self-sustainable and keeps us independent and focused on the content we love to create and share.
All our supporters can browse the website without ads, allowing much faster speeds and a clean interface. Your comments will be instantly approved and you’ll have a direct line of communication with us from within your account dashboard. You can suggest new features and apps and you’ll be able to use them before they go live.
You can choose the level of your support.
Stay kind, vigilant and ready!