@aberfan -- Related parties to the company, that are separate entities do this: Ranching tuna. But, the company was initially doing R&D and then growth from eggs of the tuna. It did not work out, thus the initial run up in SP was wiped out and then the tainted feed from Gibson made them suffer significant losses with their Yellowtail Kingfish stocks over those years.

The YTK are now on better feed growing and reaching profitability.
If anything to go by, bad tactics by companies i.e. Gibsons with their feed... is a similar story to Monsanto doing the dirty on their customers with regards to Glyphosate.

https://www.abc.net.au/news/rural/2019-03-28/glyphosate-ruling-sparks-further-controversy-over-weed-killer/10950214

Glyphosate ruling sparks further controversy over common weedkiller's cancer link